Public water system · CA0110006
ActiveCity of Hayward
At a glance
City of Hayward (PWSID CA0110006) is an active community water system in Alameda County, California. It reports serving 162,954 people through 36,641 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's Safe Drinking Water Act records list no violations for this system.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
162,954
Service connections
36,641
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does City of Hayward compare with other water systems in Alameda County?
By EPA's size categories, City of Hayward is a very large system (more than 100,000 people). Alameda County has 27 active public water systems, and City of Hayward is the 3rd-largest of them by population served. Its population served is about twice the county average of 83,320 people per system, and accounts for 7.2% of the 2,249,634 people reported by systems filed under the county. Across California, the 7,479 active systems average 5,706 people each. Nationally, the average active community water system reports serving 6,703 people, so City of Hayward is about 24 times that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. California has 2,997 active community water systems, 40% of the state's 7,479 active systems. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 506 California systems (6.8%) list purchased surface water as their primary source.
Who owns and regulates City of Hayward?
EPA lists City of Hayward as owned by a local government. The CA state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 15 of the 27 active systems in Alameda County (56%) are also owned by a local government.
Does City of Hayward have drinking water violations?
No SDWA violations on record.
EPA's SDWA violation and enforcement data (via EPA ECHO, updated quarterly) lists no violations for City of Hayward. For the latest compliance status, check EPA ECHO for current compliance history.
City of Hayward: frequently asked questions
Who runs City of Hayward?
City of Hayward (PWSID CA0110006) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does City of Hayward serve?
City of Hayward reports serving 162,954 people through 36,641 service connections in Alameda County, California.
Where does City of Hayward get its water?
EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.
Does City of Hayward have any drinking water violations?
EPA's Safe Drinking Water Act records list no violations for this system.
Is City of Hayward's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. EPA's Safe Drinking Water Act records list no violations for this system. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find City of Hayward's water quality report?
As a community water system, City of Hayward must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Alameda County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| East Bay MUD | Alameda | 1,442,800 | Community | Surface water |
| Alameda County Water District | Alameda | 344,000 | Community | Surface water |
| Dublin San Ramon Services District | Alameda | 98,776 | Community | Purchased surface water |
| City of Pleasanton | Alameda | 76,689 | Community | Purchased surface water |
| California Water Service - Livermore | Alameda | 60,414 | Community | Purchased surface water |
| City of Livermore | Alameda | 38,892 | Community | Purchased surface water |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “City of Hayward, PWSID CA0110006, California”, https://aquacensus.com/water-systems/california/city-of-hayward-ca0110006 (data as of October 1, 2026).