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Community Water System · PWS CA2900523

Washington Water District

Washington, California 95986 - drinking water served from surface water sources to 330 people, tracked in EPA SDWIS and UCMR5.

330
People served
58
EPA violations
10
Health-based
Untested
UCMR5 result

The verdict

EPA records 58 drinking-water violations at Washington Water District, 17% of them health-based - above the California per-system average.

58
Total EPA violations on record
17%
Health-based (MCL / treatment failure)
330
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Washington Water District

Washington Water District is a private-owned community water system that delivers drinking water to 330 residents in Washington, California (Nevada County) through 115 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 58 total violations for this system , of which 10 (17%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 18 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 10 violations (MR). 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. Statewide, 447 of 694 UCMR5-tested systems have reported PFAS detections (64.4%).

Washington Water District's 58 violations sit above the California average.

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
330
Total Violations
58
Health-Based Violations
10
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Private
Connections
115
County
Nevada
School/Daycare
No
MCL Violations
0
Monitoring Violations
18
Treatment Tech Violations
10

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 10 2012
Surface Water Treatment Rule TT 6 2002
Long Term 2 Enhanced Surface Water Treatment Rule TT 3 2007
Nitrate MR 2 2020
Total Haloacetic Acids (HAA5) MR 2 2020
TTHM MR 2 2020
Lead and Copper Rule MR 1 1993
LEAD AND COPPER RULE REVISIONS TT 1 2024
LEAD AND COPPER RULE REVISIONS RPT 1 2024
Gross Alpha, Excl. Radon and U MR 1 1981

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 Washington Water District.

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 CA2900523 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 Washington Water District 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
2024 LEAD AND COPPER RULE REVISIONS TT 1 SDWIS / CA2900523 / 5200
2024 LEAD AND COPPER RULE REVISIONS RPT 1 SDWIS / CA2900523 / 5200
2020 Nitrate MR 2 SDWIS / CA2900523 / 1040
2020 Total Haloacetic Acids (HAA5) MR 2 SDWIS / CA2900523 / 2456
2020 TTHM MR 2 SDWIS / CA2900523 / 2950
2012 Coliform (TCR) MR 10 SDWIS / CA2900523 / 3100
2007 Long Term 2 Enhanced Surface Water Treatment Rule TT 3 SDWIS / CA2900523 / 0800
2002 Surface Water Treatment Rule TT 6 SDWIS / CA2900523 / 0200
1993 Lead and Copper Rule MR 1 SDWIS / CA2900523 / 5000
1981 Gross Alpha, Excl. Radon and U MR 1 SDWIS / CA2900523 / 4000

How Washington Water District Compares

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

Metric Washington Water District California avg Federal benchmark
Total violations 58 21.1 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 10 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 330 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 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Washington Water District water safe to drink? ▼
Washington Water District (PWS ID: CA2900523) has 58 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 330 people using Surface Water sources.
How many people does Washington Water District serve? ▼
Washington Water District serves 330 people in Washington, California. It is a Private-owned system using Surface Water water sources with 115 service connections.
What type of violations does Washington Water District have? ▼
Washington Water District has 58 total violations: 10 health-based violations (MCL exceedances or treatment failures), 18 monitoring/reporting violations, and 10 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Washington Water District water? ▼
No PFAS testing data is available for Washington Water District under the EPA's UCMR5 monitoring program.
What water source does Washington Water District use? ▼
Washington Water District 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.
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.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.