Table of Contents
Can You Drink Tap Water in Manteca?
Yes, Manteca's tap water is generally considered safe to drink as Manteca has no active health based violations of the Safe Drinking Water Act (SDWA) that we are aware of. Other factors such as lead piping in a home, or low levels of pollutants on immunocompromised individuals, should also be considered, however. To find more recent info we might have, you can check out our boil water notice page or the city's water provider website.
According the EPA’s ECHO database, from April 30, 2019 to June 30, 2022, Manteca's water utility, City of Manteca, had 0 violations of the Safe Drinking Water Act. For more details on the violations, please see our violation history section below. The last violation for Manteca was resolved on Sept. 30, 2013. This assessment is based on the City of Manteca water system, other water systems in the city may have different results.
While tap water that meets the EPA health guidelines generally won’t make you sick to your stomach, it can still contain regulated and unregulated contaminants present in trace amounts that could potentially cause health issues over the long-run. These trace contaminants may also impact immunocompromised and vulnerable individuals.
The EPA is reviewing if it’s current regulations around pollutant levels in tap water are strict enough, and the health dangers posed by unregulated pollutants, like PFAS.
Water Quality Report for Manteca Tap Water
The most recent publicly available numbers for measured contaminant levels in Manteca tap water are in its 2020 Water Quality Report. As you can see, there are levels which the EPA considers to be acceptable, but being below the maximum allowable level doesn’t necessarily mean the water is healthy.
Lead in tap water, for example, is currently allowed at up to 15ppb by the EPA, but it has set the ideal goal for lead at zero. This highlights how meeting EPA standards doesn’t necessarily mean local tap water is healthy.
EPA regulations continue to change as it evaluates the long term impacts of chemicals and updates drinking water acceptable levels. The rules around arsenic, as well as, lead and copper are currently being re-evaluated.
There are also a number of "emerging" contaminants that are not currently. For example, PFAS (Per- and polyfluoroalkyl substances), for which the EPA has issued a health advisory. PFAS are called "forever chemicals" since they tend not to break down in the environment or the human body and can accumulate over time.
We recommend looking at the contaminants present in Manteca's water quality reports, or getting your home's tap water tested to see if you should be filtering your water.
Manteca Tap Water Safe Drinking Water Act Violation History - Prior 10 Years
Below is a ten year history of violations for the water system named City of Manteca for Manteca in California. For more details please see the "What do these Violations Mean?" section below.
From July 1, 2013 to Sept. 30, 2013, Manteca had 1 health-based Safe Drinking Water Act violation with the violation category being Maximum Contaminant Level Violation, more specifically, the violation code was Maximum Contaminant Level Violation, Average which falls into the Chemicals rule code group, and the Inorganic Chemicals rule code family for the following contaminant code: Arsenic.
From April 1, 2013 to June 30, 2013, Manteca had 1 health-based Safe Drinking Water Act violation with the violation category being Maximum Contaminant Level Violation, more specifically, the violation code was Maximum Contaminant Level Violation, Average which falls into the Chemicals rule code group, and the Inorganic Chemicals rule code family for the following contaminant code: Arsenic.
From Jan. 1, 2013 to March 31, 2013, Manteca had 1 health-based Safe Drinking Water Act violation with the violation category being Maximum Contaminant Level Violation, more specifically, the violation code was Maximum Contaminant Level Violation, Average which falls into the Chemicals rule code group, and the Inorganic Chemicals rule code family for the following contaminant code: Arsenic.
From Oct. 1, 2012 to Dec. 31, 2012, Manteca had 1 health-based Safe Drinking Water Act violation with the violation category being Maximum Contaminant Level Violation, more specifically, the violation code was Maximum Contaminant Level Violation, Average which falls into the Chemicals rule code group, and the Inorganic Chemicals rule code family for the following contaminant code: Arsenic.
From July 1, 2012 to Sept. 30, 2012, Manteca had 1 health-based Safe Drinking Water Act violation with the violation category being Maximum Contaminant Level Violation, more specifically, the violation code was Maximum Contaminant Level Violation, Average which falls into the Chemicals rule code group, and the Inorganic Chemicals rule code family for the following contaminant code: Arsenic.
From April 1, 2012 to June 30, 2012, Manteca had 1 health-based Safe Drinking Water Act violation with the violation category being Maximum Contaminant Level Violation, more specifically, the violation code was Maximum Contaminant Level Violation, Average which falls into the Chemicals rule code group, and the Inorganic Chemicals rule code family for the following contaminant code: Arsenic.
From Jan. 1, 2012 to March 31, 2012, Manteca had 1 health-based Safe Drinking Water Act violation with the violation category being Maximum Contaminant Level Violation, more specifically, the violation code was Maximum Contaminant Level Violation, Average which falls into the Chemicals rule code group, and the Inorganic Chemicals rule code family for the following contaminant code: Arsenic.
From Oct. 1, 2011 to Dec. 31, 2011, Manteca had 1 health-based Safe Drinking Water Act violation with the violation category being Maximum Contaminant Level Violation, more specifically, the violation code was Maximum Contaminant Level Violation, Average which falls into the Chemicals rule code group, and the Inorganic Chemicals rule code family for the following contaminant code: Arsenic.
Is there Lead in Manteca Water?
Based on the EPA’s ECHO Database, 90% of the samples taken from the Manteca water system, City of Manteca, between sample start date and sample end date, were at or below, 0.0004 mg/L of lead in Manteca water. This is 2.7% of the 0.015 mg/L action level. This means 10% of the samples taken from Manteca contained more lead.
While Manteca water testing may have found 0.0004 mg/L of lead in its water, that does not mean your water source has the same amount. The amount of lead in water in a city can vary greatly from neighborhood to neighborhood, or even building to building. Many buildings, particularly older ones, have lead pipes or service lines which can be a source of contamination. To find out if your home has lead, we recommend getting you water tested.
No amount of lead in water is healthy, only less dangerous. As lead accumulates in our bodies over time, even exposure to relatively small amounts can have negative health effects. For more information, please check out our Lead FAQ page.
Are there PFAS in Manteca Tap Water?
Currently, testing tap water for PFAS isn’t mandated on a national level. We do have a list of military bases where there have been suspected or confirmed leaks. There appears to be at least one military base - Sharpe Army Depot - near Manteca with suspected leaks.
With many potential sources of PFAS in tap water across the US, the best information we currently have about which cities have PFAS in their water is this ewg map, which you can check to see if Manteca has been evaluated for yet.
Our stance is better safe than sorry, and that it makes sense to try to purify the tap water just in case.
Manteca SDWA Violation History Table - Prior 10 Years
| Compliance Period | Status | Health-Based? | Category Code | Code | Rule Code | Contaminant Code | Rule Group Code | Rule Family Code |
|---|---|---|---|---|---|---|---|---|
| 07/01/2013 - 09/30/2013 | Resolved | Yes | Maximum Contaminant Level Violation (MCL) | Maximum Contaminant Level Violation, Average (02) | Arsenic (332) | Arsenic (1005) | Chemicals (300) | Inorganic Chemicals (330) |
| 04/01/2013 - 06/30/2013 | Resolved | Yes | Maximum Contaminant Level Violation (MCL) | Maximum Contaminant Level Violation, Average (02) | Arsenic (332) | Arsenic (1005) | Chemicals (300) | Inorganic Chemicals (330) |
| 01/01/2013 - 03/31/2013 | Resolved | Yes | Maximum Contaminant Level Violation (MCL) | Maximum Contaminant Level Violation, Average (02) | Arsenic (332) | Arsenic (1005) | Chemicals (300) | Inorganic Chemicals (330) |
| 10/01/2012 - 12/31/2012 | Resolved | Yes | Maximum Contaminant Level Violation (MCL) | Maximum Contaminant Level Violation, Average (02) | Arsenic (332) | Arsenic (1005) | Chemicals (300) | Inorganic Chemicals (330) |
| 07/01/2012 - 09/30/2012 | Resolved | Yes | Maximum Contaminant Level Violation (MCL) | Maximum Contaminant Level Violation, Average (02) | Arsenic (332) | Arsenic (1005) | Chemicals (300) | Inorganic Chemicals (330) |
| 04/01/2012 - 06/30/2012 | Resolved | Yes | Maximum Contaminant Level Violation (MCL) | Maximum Contaminant Level Violation, Average (02) | Arsenic (332) | Arsenic (1005) | Chemicals (300) | Inorganic Chemicals (330) |
| 01/01/2012 - 03/31/2012 | Resolved | Yes | Maximum Contaminant Level Violation (MCL) | Maximum Contaminant Level Violation, Average (02) | Arsenic (332) | Arsenic (1005) | Chemicals (300) | Inorganic Chemicals (330) |
| 10/01/2011 - 12/31/2011 | Resolved | Yes | Maximum Contaminant Level Violation (MCL) | Maximum Contaminant Level Violation, Average (02) | Arsenic (332) | Arsenic (1005) | Chemicals (300) | Inorganic Chemicals (330) |
What do these Violations Mean?
Safe Drinking Water Act Violations categories split into two groups, health based, and non-health based. Generally, health based violations are more serious, though non-health based violations can also be cause for concern.
Health Based Violations
- Maximum contaminant levels (MCLs) - maximum allowed contaminant level was exceeded.
- Maximum residual disinfectant levels (MRDLs) - maximum allowed disinfectant level was exceeded.
- Other violations (Other) - the exact required process to reduce the amounts of contaminants in drinking water was not followed.
Non-Health Based Violations
- Monitoring and reporting violations (MR, MON) - failure to conduct the required regular monitoring of drinking water quality, and/or to submit monitoring results on time.
- Public notice violations (Other) - failure to immediately alert consumers if there is a serious problem with their drinking water that may pose a risk to public health.
- Other violations (Other) - miscellaneous violations, such as failure to issue annual consumer confidence reports or maintain required records.
SDWA Table Key
| Field | Description |
|---|---|
| Compliance Period | Dates of the compliance period. |
| Status |
Current status of the violation.
|
| Health-Based? | Whether the violation is health based. |
| Category Code |
The category of violation that is reported.
|
| Code | A full description of violation codes can be accessed in the SDWA_REF_CODE_VALUES (CSV) table. |
| Contaminant Code | A code value that represents a contaminant for which a public water system has incurred a violation of a primary drinking water regulation. |
| Rule Code |
Code for a National Drinking Water rule.
|
| Rule Group Code |
Code that uniquely identifies a rule group.
|
| Rule Family Code |
Code for rule family.
|
For more clarification please visit the EPA's data dictionary.
Manteca Water - Frequently Asked Questions
| By Phone: | 209-456-8468 |
| By Email: | gmontross@ci.manteca.ca.us |
| By Mail: | 1001 W Center St. MANTECA, CA, 95337 |
Existing customers can login to their City of Manteca account to pay their Manteca water bill by clicking here.
If you want to pay your City of Manteca bill online and haven't made an account yet, you can create an account online. Please click here to create your account to pay your Manteca water bill.
If you don't want to make an account, or can't remember your account, you can make a one-time payment towards your Manteca water bill without creating an account using a one time payment portal with your account number and credit or debit card. Click here to make a one time payment.
Moving to a new house or apartment in Manteca means you will often need to put the water in your name with City of Manteca. In order to put the water in your name, please click the link to the start service form below. Start service requests for water bills typically take two business days.
Leaving your house or apartment in Manteca means you will likely need to take your name off of the water bill with City of Manteca. In order to take your name off the water bill, please click the link to the stop service form below. Stop service for water bills requests typically take two business days.
USER SUBMITTED RATINGS
- Drinking Water Pollution and Inaccessibility
- Water Pollution
- Drinking Water Quality and Accessibility
- Water Quality
The above data is comprised of subjective, user submitted opinions about the water quality and pollution in Manteca, measured on a scale from 0% (lowest) to 100% (highest).
Related FAQS
Manteca Water Quality Report (Consumer Confidence Report)
The EPA mandates that towns and cities consistently monitor and test their tap water. They must report their findings in an annual Consumer Confidence Report. Below is the most recent water quality report from Manteca's Water. If you would like to see the original version of the report, please click here.
City of Manteca
2020 Water Quality Report to Consumers
(El informe contiene información importante sobre su agua potable. Tradúzalo o hable con alguien que lo
entienda bien.)
The Safe Drinking Water Act requires that utilities issue a water quality report to consumers in addition to other notices that may be required by law. This report details where our water comes from, what it contains, and the risks our water testing and treatment are designed to prevent. The City of Manteca is committed to providing you with a safe and reliable water supply. Informed consumers are our best allies.
In order to ensure that tap water is safe to drink, the U.S. Environmental Protection Agency (USEPA) and the State Water Resources Control Board (State Board) prescribe regulations that limit the amount of certain contaminants in water provided by public water systems. The U.S. Food and Drug Administration regulations and California law also establish limits for contaminants in bottled water that must provide the same protection for public health.
Drinking water, including bottled water, may reasonably be expected to contain at least small amounts of some contaminants. The presence of contaminants does not necessarily indicate that water poses a health risk. More information about contaminants and potential health effects can be obtained by calling the USEPA’s Safe Drinking Water Hotline
Sources of drinking water (both tap water and bottled water) include rivers, lakes, streams, ponds, reservoirs, springs and wells. As water travels over the surface of the land or through the ground, it dissolves natural deposits of minerals and radioactive material and can pick up substances resulting from the presence of animals or from human activity. Contaminants that may be present in source water include:
- Microbial contaminants such as viruses and bacteria, which may come from sewage treatment plants, septic systems, agricultural livestock operations and wildlife.
-
Inorganic contaminants such as salts and metals, which can be
naturally-occurring or result from urban storm runoff, industrial or domestic wastewater discharges, oil and gas production, mining or farming. - Pesticides and herbicides, which may come from a variety of sources such as agriculture, storm water runoff and residential uses.
- Organic chemical contaminants including synthetic and volatile organic chemicals that are byproducts of industrial processes and petroleum production, and can also come from gas stations, urban storm water runoff, agricultural application and septic systems.
-
Radioactive contaminants, which can be
naturally-occurring or resulting from oil and gas production and mining activities.
Some people may be more vulnerable to contaminants in drinking water than the general population. Immuno- compromised persons such as persons with cancer undergoing chemotherapy, persons who have undergone organ transplants, people with HIV/AIDS or other immune system disorders, some elderly, and infants can be particularly at risk from infections. These people should seek advice about drinking water from their health care providers. USEPA/Centers for Disease Control (CDC) guidelines on appropriate means to lessen the risk of infection by Cryptosporidium are available from the Safe Drinking Water Hotline
NATIONAL PRIMARY DRINKING WATER REGULATION COMPLIANCE
This report was prepared by City of Manteca Public Works Department staff following prescribed reporting guidelines. For more information, call George Montross at
Date of Report: May 2021
CURRENT WATER SOURCE
The City of Manteca’s water is supplied from two sources. The first is groundwater, pumped from 15 wells located throughout the City, and the second is treated surface water, from Woodward Reservoir, which is purchased from South San Joaquin Irrigation District (SSJID). During the summer of 2005, the City began receiving up to 11,500 acre feet/year of treated surface water from (SSJID). The majority of the City’s customers receive a mixture of groundwater and surface water, this mixture changes throughout the year. For more specific water source data, contact the Public Works Department at
FUTURE WATER SOURCE
The City of Manteca will continue to supply both groundwater and surface water. In the future, the amount of surface water the City receives may increase by 7,000 acre feet/year and the City will continue to install new groundwater wells.
SOURCE WATER ASSESSMENT
-
Groundwater:
Source water assessments (SWA) were completed in December, 2001 for all existing City wells. New wells have SWA completed prior to the well producing any water for consumption by customers. The wells are considered most vulnerable to confirmed leaking underground storage tanks, gas stations, chemical/petroleum processing/storage facilities, metal plating/finishing/fabricating facilities, automobile body/repair shops and sewer collection systems.
For inquiries about the source water assessment call the City of Manteca, Public Works Department at (209)456-8400 located at 1001 West Center Street, Manteca, CA or the State Board at (209)948-7696. -
Surface Water:
Source water assessments were completed in September, 2001. The Woodward Reservoir/Stanislaus River source is considered most vulnerable to recreational activities at Woodward Reservoir, confined animal facilities (dairy), cattle grazing, and wastewater disposal. For inquiries about the source water assessment call the State Board at (209)948-7696.
PUBLIC PARTICIPATION
The public can participate in decisions that affect their water by attending City Council meetings when water related topics are scheduled for action. Council meetings are held in the Council Chambers, 1001 West Center Street, on the first and third Tuesday of every month at 7:00 p.m.
CONCERNING NITRATE IN OUR WATER
Nitrate in drinking water at levels above 10 ppm is a health risk for infants of less than six months of age. Such nitrate levels in drinking water can interfere with the capacity of the infant’s blood to carry oxygen, resulting in a serious illness; symptoms include shortness of breath and blueness of the skin. Nitrate levels above 10 ppm may also affect the ability of the blood to carry oxygen in other individuals, such as pregnant women and those with certain specific enzyme deficiencies. If you are caring for an infant, or you are pregnant, you should ask for advice from your health care provider.
CONCERNING ARSENIC IN OUR WATER
While your drinking water meets the federal and state standard for arsenic, it does contain low levels of arsenic. The arsenic standard balances the current understanding of arsenic’s possible health effects against the costs of removing arsenic from drinking water. The U.S. Environmental Protection Agency continues to research the health effects of low levels of arsenic, which is a mineral known to cause cancer in humans at high concentrations and is linked to other health effects such as skin damage and circulatory problems.
Page 2
LEAD IN WATER
If present, elevated levels of lead can cause serious health problems, especially for pregnant women and young children. Lead in drinking water is primarily from materials and components associated with service lines and home plumbing. The City of Manteca is responsible for providing high quality drinking water, but cannot control the variety of materials used in plumbing components. When your water has been sitting for several hours, you can minimize the potential for lead exposure by flushing your tap for 30 seconds to 2 minutes before using water for drinking or cooking. If you are concerned about lead in your water, you may wish to have your water tested. Information on lead in drinking water, testing methods, and steps you can take to minimize exposure is available from the Safe Drinking Water Hotline or at http://www.epa.gov/lead.
CONTAMINANTS MONITORED
The tables list all of the drinking water contaminants that were detected during the most recent sampling for the constituent. The presence of these contaminants in the water does not necessarily indicate that the water poses a health risk. We routinely perform additional monitoring for contaminants that could pose health concerns. The State Board allows us to monitor some contaminants less than once per year because the concentrations do not change frequently. Some of our data, though representative, are more than a year old.
HOW TO READ THE FOLLOWING TABLES
The column marked “Range of Detected Levels” shows the lowest, average and highest test results in our wells during the most recent monitoring. The “Average Detected Level” is determined from all test results from the most recent monitoring. “Typical Source of Contaminant” indicates where a substance usually originates. Other columns refer to:
- Maximum Contaminant Level (MCL): The highest level of a contaminant that is allowed in drinking water. Primary MCLs are set as close to the PHGs (or MCLGs) as is economically and technologically feasible. Secondary MCLs are set to protect the odor, taste, and appearance of drinking water.
- Maximum Contaminant Level Goal (MCLG): The level of a contaminant in drinking water below which there is no known or expected risk to health. MCLGs are set by the U.S. Environmental Protection Agency.
- Public Health Goal (PHG): The level of a contaminant in drinking water below which there is no known or expected risk to health. PHGs are set by the California Environmental Protection Agency.
- Maximum Residual Disinfectant Level (MRDL): The highest level of a disinfectant allowed in drinking water. There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants.
- Maximum Residual Disinfectant Level Goal (MRDLG): The level of a drinking water disinfectant below which there is no known or expected risk to health. MRDLGs do not reflect the benefits of the use of disinfectants to control microbial contaminants.
- Primary Drinking Water Standards: MCLs for contaminants that affect health along with their monitoring and reporting requirements and water treatment requirements.
- Secondary Drinking Water Standards (SDWS): MCLs for contaminants that affect taste, order or appearance of the drinking water. Contaminants with SDWS do not affect the health at their MCL levels.
- Treatment Technique: A required process intended to reduce the level of a contaminant in drinking water.
- Regulatory Action Level: The concentration of a contaminant which, if exceeded, triggers treatment or other requirements that a water system must follow.
Page 3
Table 1 - Source Water Quality Monitoring
Detection of Contaminants with a Primary Drinking Water Standard
|
Sample |
|
|
PHG |
Range of Detected Levels |
|
|
|||
Contaminant |
Units |
MCL |
or |
Groundwater |
Surface Water |
Typical Source of Contaminant |
||||
|
Date |
|
|
(MCLG) |
|
|
|
|
|
|
|
|
|
Average |
Range |
Average |
|
Range |
|
||
|
|
|
|
|
|
|||||
|
|
|
|
|
|
|
|
|
|
|
Arsenic (1) |
2020 |
ppb |
10 |
0.004 |
4.8 |
0.4 - 9.2 |
ND |
|
NA |
Erosion of natural deposits; runoff from |
|
orchards |
|||||||||
|
|
|
|
|
|
|
|
|
|
|
Barium |
2020 |
ppm |
1 |
2 |
0.11 |
0.11 |
ND |
|
NA |
Erosion of natural deposits. |
|
|
|
|
|
|
|
|
|
|
Banned nematocide that may still be present |
Dibromo- |
|
|
|
|
|
|
|
|
|
|
chloropropane |
2020 |
ppt |
200 |
1.7 |
71 |
0 - 94 |
NS |
|
NA |
in soils due to runoff/leaching from former |
(DBCP) |
|
|
|
|
|
|
|
|
|
use on vineyard and fruit trees. |
Ethylene |
|
|
|
|
|
|
|
|
|
Banned nematocide that may still be present |
Dibromide |
2020 |
ppt |
50 |
10 |
10.2 |
0 - 28 |
NS |
|
NA |
in soils due to runoff and leaching from grain |
(EDB) |
|
|
|
|
|
|
|
|
|
and fruit crops. |
Fluoride |
2020 |
ppm |
2 |
1 |
0.13 |
0.13 |
ND |
|
NA |
Erosion of natural deposits. |
|
|
|
|
|
|
|
|
|
|
|
Gross Alpha |
2020 |
pCi/L |
15 |
(0) |
10 |
2.4 – 23.1 |
NS |
|
NA |
Erosion of natural deposits. |
Activity |
|
|||||||||
|
|
|
|
|
|
|
|
|
|
|
Nitrate (2) |
2020 |
ppm |
10 |
10 |
4.2 |
0 – 9.1 |
ND |
|
NA |
Runoff and leaching from fertilizer use; |
|
erosion of natural deposits. |
|||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Selenium is an essential nutrient. However, |
|
|
|
|
|
|
|
|
|
|
some people who drink water containing |
Selenium |
2018 |
ppb |
50 |
30 |
2.1 |
0 – 3.8 |
ND |
|
NA |
selenium in excess of the MCL over many |
|
years may experience hair or fingernail |
|||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
losses, numbness in fingers or toes, or |
|
|
|
|
|
|
|
|
|
|
circulation system problems. |
Uranium |
2020 |
pCi/L |
20 |
0.43 |
7.1 |
0.81 - 12 |
NS |
|
NA |
Erosion of natural deposits. |
|
|
|
|
|
|
|
|
|
|
Discharge from industrial and agricultural |
|
|
|
|
|
|
|
|
|
|
|
1,2,3 |
|
|
|
|
|
|
|
|
|
chemical factories; leaching from hazardous |
|
|
|
|
6.3 |
0 - 40 |
|
|
|
waste sites; used as cleaning and |
|
Trichloro- |
2020 |
ppt |
5 |
0.7 |
NS |
|
NA |
maintenance solvent, paint and varnish |
||
propane (3) |
|
|
|
|
|
|
|
|
|
remover, and cleaning and degreasing |
|
|
|
|
|
|
|
|
|
|
agent; byproduct during the production of |
|
|
|
|
|
|
|
|
|
|
other compounds and pesticides.. |
|
|
|
|
|
|
|
|
|
|
|
Chloride |
2020 |
ppm |
500 |
None |
13 |
13 |
2.9 |
|
2.9 |
Runoff/leaching from natural deposits.. |
|
|
|
|
|
|
|
|
|
|
|
Iron |
2020 |
ppb |
300 |
None |
27 |
0 - 210 |
ND |
|
NA |
Leaching from natural deposits |
|
|
|
|
|
|
|
|
|
|
|
Manganese |
2020 |
ppb |
50 |
None |
0.5 |
0 – 7.3 |
ND |
|
NA |
Leaching from natural deposits |
|
|
|
|
|
|
|
|
|
|
|
Sulfate |
2020 |
ppm |
500 |
None |
12 |
12 |
1.7 |
|
1.7 |
Runoff/leaching from natural deposits. |
|
|
|
|
|
|
|
|
|
|
|
Turbidity |
2020 |
NTU |
5 |
None |
ND |
ND |
0.19 |
|
0.19 |
Soil runoff |
|
|
|
|
|
|
|
|
|
|
|
TDS |
2020 |
ppm |
1,000 |
None |
250 |
250 |
60 |
|
60 |
Runoff/leaching from natural deposits. |
|
|
|
|
|
|
|
|
|
|
|
Sampling Results for Sodium and Hardness
Sodium |
2020 |
ppm |
None |
None |
26 |
26 |
8.3 |
8.3 |
|
|
|
|
|
|
|
|
|
|
|
Hardness |
2020 |
ppm |
None |
None |
130 |
130 |
38 |
38 |
|
|
|
|
|
|
|
|
|
|
|
Naturally occurring in ground and surface waters.
Naturally occurring in ground and surface waters.
Detection of Contaminants with a Notification Levels
|
|
|
Notification |
|
|
|
|
|
Boron |
2018 |
ppm |
Level |
0.13 |
0.11 - 0.16 |
ND |
NA |
|
|
|
|||||||
|
|
|
1.0 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Notification |
|
|
|
|
|
Vanadium |
2020 |
ppb |
Level |
29 |
16.4 - 42.9 |
NS |
NA |
|
50 |
|
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Health Effects Language
The babies of some pregnant women who drink water containing boron in excess of the notification level may have an increased risk of developmental effects, based on studies in laboratory animals.
The babies of some pregnant women who drink water containing vanadium in excess of the notification level may have an increased risk of developmental effects, based on studies in laboratory animals.
Page 4
UNITS USED IN REPORTING
- ppm = parts per million ppt = parts per trillion ND = None Detected NS = Not Sampled NA = Not Applicable
- ppb = parts per billion pCi/L stands for picocuries per liter and is a radioactivity measurement
Notes from Table 1:
- Systems with Arsenic levels above 5 ppb (50% of the MCL), but below or equal to 10 ppb (the MCL) must include a specific statement. See Page 2, “Concerning Arsenic in Our Water”.
- More than half of the City wells have levels of Nitrates below 5 ppm as N and only require monitoring once every year. Those wells with detected levels of Nitrate between 5 and 10.15 ppm as N are monitored quarterly to maintain an accurate picture of the Nitrate levels. Any well that monitors a level of Nitrate above 10.15 ppm as N would be immediately retested and removed from service if the average of the two tests was above 10.15 ppm as N. Further testing and evaluations would then be performed.
-
1,2,3-Trichloropropane (TCP) had a notification level of 5 ppt until December 14, 2017, when the MCL of 5 ppt became effective. On November 13, 2018, the City of Manteca received a Compliance Order from SWRCB on account of five wells exceeding the MCL. Some people who drink water containing TCP in excess of the MCL over many years may have an increased risk of getting cancer. As of January 21, 2021, all five wells have TCP treatment installed and the well water is being filtered to remove TCP. However, a new well had a detection of TCP in October 2020, following this detection, the City immediately reduced water production from this well, while the City begins work to add filters to this well.
Table 2 – Distribution System Water Quality Monitoring
Sampling Results Showing the Detection of Coliform Bacteria for 2015
|
Highest |
|
|
|
|
|
Microbial |
percentage of |
Number of months |
MCL |
MCLG |
|
Typical Source of Microbe |
Contaminants |
positive samples |
in violation |
|
|||
|
|
|
|
|||
|
in a month |
|
|
|
|
|
Total Coliform |
1.2 % |
0 |
5% of total monthly samples |
0 |
|
Naturally present in the |
Bacteria |
|
environment |
||||
|
|
|
|
|
Sampling Results Showing the Detection of Disinfectant Residual and Disinfection
|
Date of |
|
MCL |
PHG |
Range of Detected Levels |
|
||
Contaminant |
Last Test |
Units |
[MRDL |
(MCLG) |
|
|
|
|
Minimum |
Average |
Maximum |
|
|||||
|
Result |
|
] |
[MRDL] |
|
|||
Chlorine |
December |
ppm |
[4.0] |
[4.0] |
0.79 |
0.92 |
1.02 |
|
2020 |
|
|||||||
|
|
|
|
|
|
|
|
|
TTHMs (Total |
October |
ppb |
80 |
None |
19 |
38 |
66 |
|
Trihalomethane) |
2020 |
|
||||||
|
|
|
|
|
|
|
||
Haloacetic Acids |
October |
ppb |
60 |
None |
19 |
28.6 |
47 |
|
2020 |
|
|||||||
|
|
|
|
|
|
|
|
|
Typical Source of Contaminant
Drinking water disinfectant added for treatment
Stage 2 TTHM Monitoring – Locational Running Annual Average
|
TTHM MCL |
|
|
|
|
80 ppb |
|
|
|
|
|
|
|
2020 TTHM Results (ppb) |
|
||
|
Location |
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|||
|
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|
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|
|
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|
1st Qtr |
|
2nd Qtr |
|
3rd Qtr |
4th Qtr |
||
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|
|
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|
||||
|
Site 1 |
37 |
37 |
|
24 |
34 |
||
|
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|
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|
|
|
|
|
Site 1 LRAA* |
|
35 |
|
39 |
|
34 |
33 |
|
Site 2 |
34 |
33 |
|
46 |
66 |
||
|
|
|
|
|
|
|
||
|
Site 2 LRAA* |
|
54 |
|
46 |
|
44 |
45 |
|
Site 3 |
36 |
31 |
|
21 |
33 |
||
|
|
|
|
|
|
|
||
|
Site 3 LRAA* |
|
35 |
|
34 |
|
31 |
30 |
|
Site 4 |
34 |
40 |
|
24 |
34 |
||
|
Site 4 LRAA* |
|
28 |
|
33 |
|
33 |
33 |
|
Site 5 |
39 |
37 |
|
19 |
38 |
||
|
Site 5 LRAA* |
|
33 |
|
42 |
|
35 |
33 |
|
Site 6 |
33 |
38 |
|
25 |
53 |
||
|
Site 6 LRAA* |
|
41 |
|
38 |
|
35 |
37 |
|
Site 7 |
41 |
34 |
|
46 |
66 |
||
|
Site 7 LRAA* |
|
48 |
|
45 |
|
44 |
47 |
|
Site 8 |
31 |
36 |
|
49 |
66 |
||
|
Site 8 LRAA* |
|
49 |
|
44 |
|
44 |
45 |
|
|
|
|
|
|
|
|
|
Page 5
Table 2 – Distribution System Water Quality Monitoring (Continued)
Stage 2 HAA5 Monitoring – Locational Running Annual Average
|
HAA5 MCL |
|
|
|
|
60 ppb |
|
|
|
|
|
|
|
2020 HAA5 Results (ppb) |
|
||
|
Location |
|
|
|
|
|||
|
|
|
|
|
|
|
|
|
|
1st Qtr |
|
2nd Qtr |
|
3rd Qtr |
4th Qtr |
||
|
|
|
|
|
||||
|
Site 1 |
31 |
32 |
|
22 |
26 |
||
|
Site 1 LRAA* |
|
28 |
|
31 |
|
29 |
28 |
|
Site 2 |
29 |
23 |
|
30 |
47 |
||
|
Site 2 LRAA* |
|
41 |
|
35 |
|
33 |
42 |
|
Site 3 |
27 |
25 |
|
19 |
26 |
||
|
Site 3 LRAA* |
|
27 |
|
26 |
|
25 |
24 |
|
Site 4 |
24 |
33 |
|
16 |
23 |
||
|
Site 4 LRAA* |
|
20 |
|
25 |
|
25 |
24 |
|
Site 5 |
27 |
28 |
|
22 |
27 |
||
|
Site 5 LRAA* |
|
22 |
|
30 |
|
27 |
26 |
|
Site 6 |
31 |
28 |
|
21 |
33 |
||
|
|
|
|
|
|
|
||
|
Site 6 LRAA* |
|
32 |
|
29 |
|
28 |
28 |
|
Site 7 |
30 |
30 |
|
33 |
39 |
||
|
|
|
|
|
|
|
||
|
Site 7 LRAA* |
|
36 |
|
34 |
|
33 |
33 |
|
Site 8 |
27 |
33 |
|
34 |
40 |
||
|
|
|
|
|
|
|
||
|
Site 8 LRAA* |
|
37 |
|
34 |
|
34 |
34 |
|
|
|
|
|
|
|
|
|
Locational running annual averages for quarters 1 – 3 are based on results from previous quarters not reported on the TTHM or HAA5 tables.
Sampling Results Showing the Detection of Lead and Copper
|
|
|
|
|
90th |
Number of |
|
|
Number of |
|
|
|
|
|
Date of Last |
|
Action |
|
Sites |
|
Number of |
Schools |
|
|
|
||
Contaminant |
Units |
MCLG |
Percentil |
|
Typical Source of |
|
|||||||
Exceeding |
|
Samples |
Requesting |
|
|||||||||
Test Result |
Level |
e Level |
|
Contaminant |
|
||||||||
|
|
|
|
|
Detected |
Action |
|
Collected |
Lead |
|
|
|
|
|
|
|
|
|
Level |
|
|
Sampling |
|
|
|
||
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|||
|
|
|
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|
|
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|
|
|
Internal |
corrosion |
of |
|
Lead |
July |
ppb |
15 |
2 |
0.7 |
0 |
33 |
0 |
household |
water plumbing |
|||
2018 |
systems; erosion of natural |
||||||||||||
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|||||
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|
deposits. |
|
|
|
|
|
|
|
|
|
|
|
|
|
Internal |
corrosion |
of |
|
Copper |
July |
ppm |
1.3 |
0.17 |
.145 |
0 |
33 |
NA |
household |
water plumbing |
|||
2018 |
systems; erosion of natural |
||||||||||||
|
|
|
|
|
|
|
|
|
|||||
|
|
|
|
|
|
|
|
|
|
deposits. |
|
|
|
UNITS USED IN REPORTING |
|
|
|
|
|
|
|
|
|
|
|
||
ppm = parts per million |
ppt = parts per trillion ND = None Detected NS = Not Sampled NA = Not Applicable |
|
|
||||||||||
- ppb = parts per billion pCi/L stands for picocuries per liter and is a radioactivity measurement
- NTU = Nephelometric Turbidity Unit
Page 6
Table 3 – Sampling Results Showing Treatment Of Surface Water Sources
Treatment Technique (4) |
Ultrafiltration Membrane |
|
(Type of approved filtration technology used) |
||
|
||
|
|
Turbidity Performance Standards (5) |
Turbidity of the filtered water must: |
|
1 - Be less than or equal to 0.1 NTU in 95% of measurements in a month. |
||
(that must be met through the water treatment process) |
2 - Not to exceed 1.0 NTU any time. |
|
|
||
|
|
|
Lowest monthly percentage of samples that met Turbidity |
100% |
|
Performance Standard No. 1. |
||
|
||
Highest single turbidity measurement during the year |
0.050 NTU |
|
Number of violations of any surface water treatment |
0 |
|
requirements |
||
|
||
UNITS USED IN REPORTING |
|
|
ppm = parts per million ppt = parts per trillion |
ND = None Detected NS = Not Sampled NA = Not Applicable |
- ppb = parts per billion pCi/L stands for picocuries per liter and is a radioactivity measurement
- NTU = Nephelometric Turbidity Unit
Notes from Table 3:
- A required process intended to reduce the level of a contaminant in drinking water.
- Turbidity (measured in NTU) is a measurement of the cloudiness of water and is a good indicator of water quality and filtration performance. Turbidity results which meet performance standards are considered to be in compliance with filtration requirements.
Page 7
Contaminants
City of Manteca
EWG's drinking water quality report shows results of tests conducted by the water utility and provided to the Environmental Working Group by the California State Water Resources Control Board, as well as information from the U.S. EPA Enforcement and Compliance History database (ECHO). For the latest quarter assessed by the U.S. EPA (January 2019 - March 2019), tap water provided by this water utility was in compliance with federal health-based drinking water standards.
Utility details
- Serves: 66451
- Data available: 2012-2017
- Data Source: Purchased surface water
- Total: 27
Contaminants That Exceed Guidelines
- 1%2C2%2C3-Trichloropropane
- 1%2C2-Dibromo-3-chloropropane (DBCP)
- Arsenic
- Bromodichloromethane
- Chloroform
- Chromium (hexavalent)
- Dibromochloromethane
- Dichloroacetic acid
- Nitrate
- Nitrate and nitrite
- Radium%2C combined (-226 & -228)
- Total trihalomethanes (TTHMs)
- Trichloroacetic acid
- Uranium
Other Detected Contaminants
- Barium
- Bromoform
- Chlorate
- Chromium (total)
- Dibromoacetic acid
- Ethylene dibromide
- Fluoride
- Haloacetic acids (HAA5)
- Manganese
- Molybdenum
- Monochloroacetic acid
- Strontium
- Vanadium
Reminder
Always take extra precautions, the water may be safe to drink when it leaves the sewage treatment plant but it may pick up pollutants during its way to your tap. We advise that you ask locals or hotel staff about the water quality. Also, note that different cities have different water mineral contents.