Public water system · CA0110008
ActiveCity of Pleasanton
At a glance
City of Pleasanton (PWSID CA0110008) is an active community water system in Alameda County, California. It reports serving 76,689 people through 22,334 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list 2 violations for this system; all are health-based, and the most recent began in December 1995.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
76,689
Service connections
22,334
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does City of Pleasanton compare with other water systems in Alameda County?
By EPA's size categories, City of Pleasanton is a large system (10,001 to 100,000 people). Alameda County has 27 active public water systems, and City of Pleasanton is the 5th-largest of them by population served. Its population served is roughly in line with the county average of 83,320 people per system, and accounts for 3.4% 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 Pleasanton is about 11 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 Pleasanton?
EPA lists City of Pleasanton 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 Pleasanton have drinking water violations?
EPA's records list 2 violations for this system; all are health-based, and the most recent began in December 1995. The violations listed here began between November 1995 and December 1995. By type: 2 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (2 of them). EPA lists 2 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 1995-12-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1995-11-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
All 2 violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
City of Pleasanton: frequently asked questions
Who runs City of Pleasanton?
City of Pleasanton (PWSID CA0110008) 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 Pleasanton serve?
City of Pleasanton reports serving 76,689 people through 22,334 service connections in Alameda County, California.
Where does City of Pleasanton 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 Pleasanton have any drinking water violations?
EPA's records list 2 violations for this system; all are health-based, and the most recent began in December 1995. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is City of Pleasanton'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 records list 2 violations for this system; all are health-based, and the most recent began in December 1995. 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 Pleasanton's water quality report?
As a community water system, City of Pleasanton 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 |
| City of Hayward | Alameda | 162,954 | Community | Purchased surface water |
| Dublin San Ramon Services District | Alameda | 98,776 | 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 Pleasanton, PWSID CA0110008, California”, https://aquacensus.com/water-systems/california/city-of-pleasanton-ca0110008 (data as of October 1, 2026).