PlainWater
States → California

SONOMA STATE UNIVERSITY

PWS ID: CA4910027 · ROHNERT PARK, California 94928

SONOMA STATE UNIVERSITY serves 10,986 people in ROHNERT PARK, California using Groundwater water sources. It has 22 recorded EPA violations, including 12 health-based violations. PFAS "forever chemicals" were detected in UCMR5 testing (1 compound found).

Water Quality Snapshot: SONOMA STATE UNIVERSITY

SONOMA STATE UNIVERSITY is a state-owned community water system that delivers drinking water to 10,986 residents in ROHNERT PARK, California (Sonoma County) through 93 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 22 total violations for this system , of which 12 (55%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 7 monitoring and reporting violations are on file. The most recent violation on record dates to 2017.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 10 violations (MCL, health-based). Under EPA's UCMR5 PFAS monitoring program, 1 PFAS compound was detected in samples collected from this system, with a maximum reported concentration of 11 ppt. PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.

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 STATE UNIVERSITY's 22 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.

PFAS Detected

1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served
10,986
Total Violations
22
Health-Based Violations
12
Water Source
Groundwater

System Details

System Type
Community
Owner Type
State
Connections
93
County
Sonoma
School/Daycare
Yes
MCL Violations
10
Monitoring Violations
7
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 10 2004
Coliform (TCR) MR 4 2011
Lead and Copper Rule MR 3 2017
Groundwater Rule TT 2 2017

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 2 of 56 samples detected PFAS.

Contaminant Date Result MRL Status
lithium 6/4/2024 11.0000 µg/L 9 µg/L Detected
PFDA 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 6/4/2024 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 6/4/2024 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 6/4/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 6/4/2024 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 6/4/2024 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 6/4/2024 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 6/4/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 6/4/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFDoA 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 6/4/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 6/4/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 6/4/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpS 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 6/4/2024 <0.004 µg/L 0.004 µg/L Not Detected
NFDHA 6/4/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFEESA 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 12/5/2023 <0.004 µg/L 0.004 µg/L Not Detected
11Cl-PF3OUdS 12/5/2023 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 12/5/2023 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 12/5/2023 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 12/5/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 12/5/2023 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 12/5/2023 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 12/5/2023 <0.003 µg/L 0.003 µg/L Not Detected
NEtFOSAA 12/5/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 12/5/2023 <0.007 µg/L 0.007 µg/L Not Detected
PFUnA 12/5/2023 <0.002 µg/L 0.002 µg/L Not Detected
NMeFOSAA 12/5/2023 <0.006 µg/L 0.006 µg/L Not Detected
PFPeS 12/5/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFTA 12/5/2023 <0.008 µg/L 0.008 µg/L Not Detected
NFDHA 12/5/2023 <0.02 µg/L 0.02 µg/L Not Detected
lithium 12/5/2023 10.0000 µg/L 9 µg/L Detected
PFMBA 12/5/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 12/5/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 12/5/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 12/5/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 12/5/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFEESA 12/5/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 12/5/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHpS 12/5/2023 <0.003 µg/L 0.003 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 SONOMA STATE UNIVERSITY.

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 CA4910027 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 STATE UNIVERSITY 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
2017 Lead and Copper Rule MR 3 SDWIS / CA4910027 / 5000
2017 Groundwater Rule TT 2 SDWIS / CA4910027 / 0700
2011 Coliform (TCR) MR 4 SDWIS / CA4910027 / 3100
2004 Coliform (TCR) MCL 10 SDWIS / CA4910027 / 3100

How SONOMA STATE UNIVERSITY Compares

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

Metric SONOMA STATE UNIVERSITY California avg Federal benchmark
Total violations 22 21.1 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 12 8.8 Indicates a contaminant exceeded a federal MCL
PFAS detection 1 compound 64.4% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 10,986 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 STATE UNIVERSITY water safe to drink? ▼
SONOMA STATE UNIVERSITY (PWS ID: CA4910027) has 22 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 1 PFAS compound found. This system serves 10,986 people using Groundwater sources.
How many people does SONOMA STATE UNIVERSITY serve? ▼
SONOMA STATE UNIVERSITY serves 10,986 people in ROHNERT PARK, California. It is a State-owned system using Groundwater water sources with 93 service connections.
What type of violations does SONOMA STATE UNIVERSITY have? ▼
SONOMA STATE UNIVERSITY has 22 total violations: 12 health-based violations (MCL exceedances or treatment failures), 7 monitoring/reporting violations, and 2 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in SONOMA STATE UNIVERSITY water? ▼
Yes. UCMR5 testing detected 1 PFAS compound in SONOMA STATE UNIVERSITY's water supply: lithium. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does SONOMA STATE UNIVERSITY use? ▼
SONOMA STATE UNIVERSITY 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.

Explore PlainWater

Water in California

All systems in state
All States

Water quality by state
Contaminants

PFAS & other pollutants
Guides

Understanding water quality

Related Data for California

Environmental Data → Natural Hazards → Air Quality → Healthcare Access → Climate Data →
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.

Related

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