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SONOMA COUNTY CSA 41-JENNER

PWS ID: CA4900532 · SANTA ROSA, California 95403

SONOMA COUNTY CSA 41-JENNER serves 406 people in SANTA ROSA, California using Surface Water water sources. It has 70 recorded EPA violations, including 28 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: SONOMA COUNTY CSA 41-JENNER

SONOMA COUNTY CSA 41-JENNER is a local-owned community water system that delivers drinking water to 406 residents in SANTA ROSA, California (Sonoma County) through 123 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 70 total violations for this system , of which 28 (40%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 17 monitoring and reporting violations are on file. The most recent violation on record dates to 2021.

The most frequently cited contaminant at this system is TTHM, recorded in 16 violations (MCL, health-based). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

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. SONOMA COUNTY CSA 41-JENNER's 70 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
406
Total Violations
70
Health-Based Violations
28
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
123
County
Sonoma
School/Daycare
No
MCL Violations
26
Monitoring Violations
17
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
TTHM MCL 16 2020
Total Haloacetic Acids (HAA5) MCL 10 2020
Surface Water Treatment Rule TT 2 2006
Revised Total Coliform Rule MON 2 2019
Total Haloacetic Acids (HAA5) MR 2 2021
Gross Alpha, Excl. Radon and U MR 2 1981
Surface Water Treatment Rule MR 2 1999
TTHM MR 2 2021
Toxaphene MR 1 1981
2,4,5-TP MR 1 1981
Methoxychlor MR 1 1981
2,4-D MR 1 1981
BHC-GAMMA MR 1 1981
Endrin MR 1 1981
Lead and Copper Rule MR 1 1993

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 SONOMA COUNTY CSA 41-JENNER.

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 CA4900532 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 SONOMA COUNTY CSA 41-JENNER 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
2021 Total Haloacetic Acids (HAA5) MR 2 SDWIS / CA4900532 / 2456
2021 TTHM MR 2 SDWIS / CA4900532 / 2950
2020 TTHM MCL 16 SDWIS / CA4900532 / 2950
2020 Total Haloacetic Acids (HAA5) MCL 10 SDWIS / CA4900532 / 2456
2019 Revised Total Coliform Rule MON 2 SDWIS / CA4900532 / 8000
2006 Surface Water Treatment Rule TT 2 SDWIS / CA4900532 / 0200
1999 Surface Water Treatment Rule MR 2 SDWIS / CA4900532 / 0200
1993 Lead and Copper Rule MR 1 SDWIS / CA4900532 / 5000
1981 Gross Alpha, Excl. Radon and U MR 2 SDWIS / CA4900532 / 4000
1981 Toxaphene MR 1 SDWIS / CA4900532 / 2020
1981 2,4,5-TP MR 1 SDWIS / CA4900532 / 2110
1981 Methoxychlor MR 1 SDWIS / CA4900532 / 2015
1981 2,4-D MR 1 SDWIS / CA4900532 / 2105
1981 BHC-GAMMA MR 1 SDWIS / CA4900532 / 2010
1981 Endrin MR 1 SDWIS / CA4900532 / 2005

How SONOMA COUNTY CSA 41-JENNER Compares

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

Metric SONOMA COUNTY CSA 41-JENNER California avg Federal benchmark
Total violations 70 21.1 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 28 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 406 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 SONOMA COUNTY CSA 41-JENNER water safe to drink? ▼
SONOMA COUNTY CSA 41-JENNER (PWS ID: CA4900532) has 70 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 406 people using Surface Water sources.
How many people does SONOMA COUNTY CSA 41-JENNER serve? ▼
SONOMA COUNTY CSA 41-JENNER serves 406 people in SANTA ROSA, California. It is a Local-owned system using Surface Water water sources with 123 service connections.
What type of violations does SONOMA COUNTY CSA 41-JENNER have? ▼
SONOMA COUNTY CSA 41-JENNER has 70 total violations: 28 health-based violations (MCL exceedances or treatment failures), 17 monitoring/reporting violations, and 2 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in SONOMA COUNTY CSA 41-JENNER water? ▼
No PFAS testing data is available for SONOMA COUNTY CSA 41-JENNER under the EPA's UCMR5 monitoring program.
What water source does SONOMA COUNTY CSA 41-JENNER use? ▼
SONOMA COUNTY CSA 41-JENNER uses Surface Water 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. This data is provided for informational purposes only.

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

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