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KEYES COMMUNITY SERVICES DIST.

PWS ID: CA5010009 · KEYES, California 95328

KEYES COMMUNITY SERVICES DIST. serves 5,672 people in KEYES, California using Groundwater water sources. It has 122 recorded EPA violations, including 117 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: KEYES COMMUNITY SERVICES DIST.

KEYES COMMUNITY SERVICES DIST. is a local-owned community water system that delivers drinking water to 5,672 residents in KEYES, California (Stanislaus County) through 1,477 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 122 total violations for this system , of which 117 (96%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 4 monitoring and reporting violations are on file. The most recent violation on record dates to 2020.

The most frequently cited contaminant at this system is Arsenic, recorded in 110 violations (MCL, health-based). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

Across California, EPA tracks 7,249 public water systems serving 42,404,883 people, with 153,308 cumulative violations and 63,983 health-based violations on record. About 89% of systems in the state carry at least one violation, and state-wide the average per system is 21.1 violations. KEYES COMMUNITY SERVICES DIST.'s 122 violations sit above the California average. Statewide, 447 of 694 UCMR5-tested systems have reported PFAS detections (64.4%). All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
5,672
Total Violations
122
Health-Based Violations
117
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
1,477
County
Stanislaus
School/Daycare
No
MCL Violations
117
Monitoring Violations
4
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Arsenic MCL 110 2020
Coliform (TCR) MCL 6 1995
Nitrate-Nitrite MCL 1 1992
Fluoride MR 1 1987
Nitrate MR 1 1987
Arsenic MR 1 1987
Selenium MR 1 1987

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 60 samples detected PFAS.

Contaminant Date Result MRL Status
PFHpA 8/8/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 8/8/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 8/8/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFBS 8/8/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 8/8/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 8/8/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 8/8/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 8/8/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHpS 8/8/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 8/8/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFEESA 8/8/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 8/8/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 8/8/2023 <0.004 µg/L 0.004 µg/L Not Detected
9Cl-PF3ONS 8/8/2023 <0.002 µg/L 0.002 µg/L Not Detected
4:2 FTS 8/8/2023 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 8/8/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFNA 8/8/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFBA 8/8/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFOS 8/8/2023 <0.004 µg/L 0.004 µg/L Not Detected
HFPO-DA 8/8/2023 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 8/8/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 8/8/2023 <0.002 µg/L 0.002 µg/L Not Detected
8:2 FTS 8/8/2023 <0.005 µg/L 0.005 µg/L Not Detected
11Cl-PF3OUdS 8/8/2023 <0.005 µg/L 0.005 µg/L Not Detected
NFDHA 8/8/2023 <0.02 µg/L 0.02 µg/L Not Detected
NEtFOSAA 4/3/2023 <0.005 µg/L 0.005 µg/L Not Detected
lithium 4/3/2023 <9 µg/L 9 µg/L Not Detected
PFTA 4/3/2023 <0.008 µg/L 0.008 µg/L Not Detected
PFTrDA 4/3/2023 <0.007 µg/L 0.007 µg/L Not Detected
NMeFOSAA 4/3/2023 <0.006 µg/L 0.006 µg/L Not Detected
PFHxS 10/4/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 10/4/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 10/4/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFOA 10/4/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFHxA 10/4/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 10/4/2023 <0.002 µg/L 0.002 µg/L Not Detected
PFHpA 10/4/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFTA 10/4/2023 <0.008 µg/L 0.008 µg/L Not Detected
PFDA 10/4/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 10/4/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 10/4/2023 <0.003 µg/L 0.003 µg/L Not Detected
lithium 10/4/2023 <9 µg/L 9 µg/L Not Detected
PFEESA 10/4/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 10/4/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 10/4/2023 <0.003 µg/L 0.003 µg/L Not Detected
NMeFOSAA 10/4/2023 <0.006 µg/L 0.006 µg/L Not Detected
PFTrDA 10/4/2023 <0.007 µg/L 0.007 µg/L Not Detected
11Cl-PF3OUdS 10/4/2023 <0.005 µg/L 0.005 µg/L Not Detected
NEtFOSAA 10/4/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 10/4/2023 <0.005 µg/L 0.005 µg/L Not Detected

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records — or to file a complaint, request a Consumer Confidence Report, or check current monitoring status — go directly to the federal and state regulators that enforce the Safe Drinking Water Act for KEYES COMMUNITY SERVICES DIST..

Federal Source of Truth

EPA SDWIS — Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID CA5010009 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

California Drinking Water Authority

California State Water Resources Control Board — Division of Drinking Water is the primacy agency that licenses and inspects KEYES COMMUNITY SERVICES DIST. under EPA-delegated authority.

Open CA regulator portal

Source: California State Water Resources Control Board — Division of Drinking Water

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2020 Arsenic MCL 110 SDWIS / CA5010009 / 1005
1995 Coliform (TCR) MCL 6 SDWIS / CA5010009 / 3100
1992 Nitrate-Nitrite MCL 1 SDWIS / CA5010009 / 1038
1987 Fluoride MR 1 SDWIS / CA5010009 / 1025
1987 Nitrate MR 1 SDWIS / CA5010009 / 1040
1987 Arsenic MR 1 SDWIS / CA5010009 / 1005
1987 Selenium MR 1 SDWIS / CA5010009 / 1045

How KEYES COMMUNITY SERVICES DIST. Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric KEYES COMMUNITY SERVICES DIST. California avg Federal benchmark
Total violations 122 21.1 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 117 8.8 Indicates a contaminant exceeded a federal MCL
PFAS detection None 64.4% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 5,672 5,850 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 7,249 regulated public water systems in California.

Federal MCL reference — Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is KEYES COMMUNITY SERVICES DIST. water safe to drink? ▼
KEYES COMMUNITY SERVICES DIST. (PWS ID: CA5010009) has 122 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 5,672 people using Groundwater sources.
How many people does KEYES COMMUNITY SERVICES DIST. serve? ▼
KEYES COMMUNITY SERVICES DIST. serves 5,672 people in KEYES, California. It is a Local-owned system using Groundwater water sources with 1,477 service connections.
What type of violations does KEYES COMMUNITY SERVICES DIST. have? ▼
KEYES COMMUNITY SERVICES DIST. has 122 total violations: 117 health-based violations (MCL exceedances or treatment failures), 4 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in KEYES COMMUNITY SERVICES DIST. water? ▼
No. KEYES COMMUNITY SERVICES DIST. was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does KEYES COMMUNITY SERVICES DIST. use? ▼
KEYES COMMUNITY SERVICES DIST. uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.

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Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.

Read our methodology — how this data is sourced, computed, and verified.

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Data sourced from $official public datasets. See our methodology for details. Retrieved and formatted by Kiznis Studio Editorial