Public water system · CA5010009

Active

Keyes Community Services Dist.

At a glance

Keyes Community Services Dist. (PWSID CA5010009) is an active community water system in Stanislaus County, California. It reports serving 5,672 people through 1,477 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 12 are health-based, and the most recent began in January 2020.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

5,672

Service connections

1,477

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDCA5010009

System typeCommunity water system

Activity statusActive

Population served5,672

Service connections1,477

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyCA state drinking water program

City served—

StateCalifornia

ZIP—

CountyStanislaus County

How does Keyes Community Services Dist. compare with other water systems in Stanislaus County?

By EPA's size categories, Keyes Community Services Dist. is a medium system (3,301 to 10,000 people). Stanislaus County has 191 active public water systems. Its population served is about twice the county average of 2,684 people per system, and accounts for 1.1% of the 512,656 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 Keyes Community Services Dist. is about 15% below 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. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 6,179 California systems (83%) list groundwater as their primary source.

Who owns and regulates Keyes Community Services Dist.?

EPA lists Keyes Community Services Dist. 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. 57 of the 191 active systems in Stanislaus County (30%) are also owned by a local government.

Does Keyes Community Services Dist. have drinking water violations?

Of the 12 most recent violations in EPA's records, 12 are health-based, and the most recent began in January 2020. The violations listed here began between April 2017 and January 2020. By type: 12 contaminant level above the legal limit. The contaminant or rule involved most often is Arsenic (12 of them). EPA lists 12 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
2020-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2019-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2019-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2019-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2019-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2018-09-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2018-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2018-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2018-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2017-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2017-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2017-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved

The 12 most recent 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.

Keyes Community Services Dist.: frequently asked questions

Who runs Keyes Community Services Dist.?

Keyes Community Services Dist. (PWSID CA5010009) is a community water system owned by a local government. It is regulated by the CA state drinking water program.

How many people does Keyes Community Services Dist. serve?

Keyes Community Services Dist. reports serving 5,672 people through 1,477 service connections in Stanislaus County, California.

Where does Keyes Community Services Dist. get its water?

EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.

Does Keyes Community Services Dist. have any drinking water violations?

Of the 12 most recent violations in EPA's records, 12 are health-based, and the most recent began in January 2020. 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 Keyes Community Services Dist.'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. Of the 12 most recent violations in EPA's records, 12 are health-based, and the most recent began in January 2020. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.

Where can I find Keyes Community Services Dist.'s water quality report?

As a community water system, Keyes Community Services Dist. 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 Stanislaus County

Water system	County	Population served	Type	Source
Modesto, City of	Stanislaus	218,771	Community	Purchased surface water
Turlock, City of	Stanislaus	72,682	Community	Purchased surface water
Ceres, City of	Stanislaus	54,513	Community	Purchased surface water
Patterson, City of	Stanislaus	24,977	Community	Groundwater
Riverbank, City of	Stanislaus	24,834	Community	Groundwater
Oakdale, City of	Stanislaus	23,235	Community	Groundwater

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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, “Keyes Community Services Dist., PWSID CA5010009, California”, https://aquacensus.com/water-systems/california/keyes-community-services-dist-ca5010009 (data as of October 1, 2026).