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Mark Houghton, Public Works Director

Water System

City of Manteca 2005 Water Master Plan (11.5 MB)
City of Manteca 2005 Urban Water Management Plan (12 MB)

Water Safe drinking water is a carefully manufactured product. It is collected, treated, tested and delivered to your home and/or business by the City of Manteca. The City of Manteca has been delivering water to the public since 1917. During those 90+ years, we have constructed a total of 25 wells for domestic use. The water system currently consists of 18 groundwater wells. Seven wells have been taken out of service due to their old age and shallow depths. The water that is pumped from the ground is pushed through approximately 170 miles of pipeline located underneath City streets. We currently receive 100% of our drinking water from groundwater sources, but surface water will be available in the future.

Drop of Water Floating In Space Contact the Public Works Department at 456-8400 or e-mail us at for additional information on water conservation measures or to schedule a full water survey of your home or business. Trained City staff will inspect your home or business and address ways you can save water and reduce your water bill. Call the City Water Department at 456-8466 or email us at to make arrangements for a technician to assist you with programming your sprinkler timer.

What You Can Do

Know The Rules: The City of Manteca Water Conservation Program runs all year long, starting January 1, 2015.

Do you know where your water meter is?
Along the edge of the public sidewalk in front of your house, there is a rectangular concrete box with the word "Water" on the lid. The water meter is inside that box.

Do you know where your main water shut-off valve is?
Now that you have found your water meter, you have found one main shut-off. The valve on the property side of the meter will shut off the water. However you need a special tool to turn this valve. There is a second main shut-off valve closer to the house that can be operated by hand.

Do you know where your faucet and toilet shut-off valves are?
Look under your sink cabinets and next to the toilet; there is a valve where the water line comes out of the wall or floor. This valve will shut off the water to each fixture.

Take a Home Water Audit:
Turn off all the water around the house. Watch the small black triangle in the middle of your water meter or note the location of the sweep hand and check it after 10 minutes. If it moves, you have a leak somewhere. Double check that all fixtures were off during your test. Drop dye tablets or food coloring in the toilet tank. Do not use the toilet for 10 minutes. If any of the dye is in the bowl, you have a leak. Stop, Look and Listen for leaks at all water-using appliances and fixtures. Make any necessary repairs to stop leaks.

Make A Difference:
  • Use water conservation measures.
  • Adopt a water conservation lifestyle.
  • Get the whole family involved in water conservation around the house.

Let Us Help: Contact the Public Works Department at 456-8400 or email us at for additional information on water conservation measures or to schedule a full water survey of your home or business. Trained City Staff will inspect the site and address ways you can save water and reduce your water bill.

Contact the City Water Department at 456-8466 or email us at to make arrangements for a technician to assist you with programming your sprinkler timer. Water Usage: Indoor Water Consumption

Surface Water

What is the South County Surface Water Supply Project?
The South County Surface Water Supply Project is a joint South San Joaquin Irrigation District, City of Manteca, City of Lathrop, City of Tracy and City of Escalon project which includes the construction of a state-of-the-art water treatment plant at Woodward Reservoir and 40 miles of pipeline to deliver treated water to each of the participating cities.

What is the significance of this Project?
The South County Surface Water Supply Project will enable each of the participating cities to meet their present and future water needs. The project will help preserve groundwater quality and promote regional water management planning, keeping water historically used in San Joaquin County within the County.

Why is this project important to the City of Manteca?
Waterfall at Goodwin DamThe City of Manteca relies entirely on groundwater to meet the water demand of its residents. The current demand overdrafts the existing groundwater supply which, if continued, will result in degradation of our groundwater resources.

While the City’s water supply continues to comply with all Federal and State drinking water standards, measures must be taken to ensure future water quality. The City of Manteca plans to supplement the groundwater with treated surface water from the South County Surface Water Project to eliminate overdrafting thus preserving groundwater quality for Manteca’s future.

Arsenic Information

Important Information About Your Drinking Water
The City of Manteca's Water System has Levels of Arsenic Above Drinking Water Standards
Our water system recently failed a drinking water standard. Although this is not an emergency, as our customers, you have a right to know what happened, what you should do, and what we are doing to correct this situation. We routinely monitor for the presence of drinking water contaminants. Recent testing results show that nine wells in our system exceed the standard, or maximum contaminant level (MCL), for Arsenic. The Federal standard for Arsenic is 10 ug/L. The annual average of the nine wells that are out of compliance is 13.7 ug/L. Compliance with the arsenic MCL is based on the average concentration of four consecutive quarterly samples (or an annual average) for each well, unless fewer samples would cause the running annual average to be exceeded.

What should I do?
You do not need to use an alternative (e.g. , bottled) water supply. However, if you have specific health concerns, consult your doctor.

What does this mean?
This is not an immediate risk. If it had been, you would have been notified immediately. However, some people who drink water containing arsenic in excess of the MCL over many years may experience skin damage or circulatory system problems, and may have an increased risk of getting cancer.

What happened?
The Environmental Protection Agency (EPA) recently reduced the Arsenic MCL from 50 ug/L down to 10 ug/L. In accordance with this reduction, the City of Manteca collected samples from all of its wells and to date nine wells contain water with Arsenic levels above the MCL.

What was done?
The City of Manteca is currently installing filters to remove arsenic from wells with arsenic levels above the Federal MCL of 10 ug/L. In the meantime, the City is maximizing water production from sources with low arsenic levels.

Please share this information with all the other people who drink this water, especially those who may not have received this notice directly (for example, people in apartments, nursing homes, schools, and businesses). You can do this by posting this notice in a public place or distributing copies by hand or mail.

For more information, please contact Keith Conarroe at (209) 456-8411 or at the following mailing address: 1001 W. Center St, Manteca, CA 95337, or send an e-mail to:

This notice is being sent to you by the City of Manteca, in compliance with the California Domestic Water Quality and Monitoring Regulations, as a means of keeping the public informed. Dated: 7/24/08

1001 W. Center St. Manteca California 95337 TELEPHONE: (209) 456-8400 © 2018 ALL RIGHTS RESERVED SUNDAY, APRIL 22, 2018