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Community Water System · PWS WA5366400

Pasco Water Department

Pasco, Washington 99301 - drinking water served from surface water sources to 116,342 people, tracked in EPA SDWIS and UCMR5.

116,342
People served
62
EPA violations
4
Health-based
No PFAS
UCMR5 result

The verdict

EPA records 62 drinking-water violations at Pasco Water Department, 6% of them health-based - below the Washington per-system average.

62
Total EPA violations on record
6%
Health-based (MCL / treatment failure)
116,342
People served by this system
0
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Pasco Water Department

Pasco Water Department is a local-owned community water system that delivers drinking water to 116,342 residents in Pasco, Washington (Franklin County) through 29,554 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 62 total violations for this system , of which 4 (6%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 56 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 Lead and Copper Rule, recorded in 12 violations (MR). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

Across Washington, EPA tracks 4,557 public water systems serving 9,736,844 people, with 314,648 cumulative violations and 20,590 health-based violations on record. About 92% of systems in the state carry at least one violation, and state-wide the average per system is 69 violations. Statewide, 98 of 247 UCMR5-tested systems have reported PFAS detections (39.7%).

Pasco Water Department's 62 violations sit below the Washington 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
116,342
Total Violations
62
Health-Based Violations
4
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
29,554
County
Franklin
School/Daycare
No
MCL Violations
4
Monitoring Violations
56
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 12 2006
Coliform (TCR) MCL 3 1991
1,2,4-Trichlorobenzene MR 2 2007
o-Dichlorobenzene MR 2 2007
p-Dichlorobenzene MR 2 2007
Vinyl chloride MR 2 2007
trans-1,2-Dichloroethylene MR 2 2007
1,2-Dichloroethane MR 2 2007
1,1,1-Trichloroethane MR 2 2007
1,2-Dichloropropane MR 2 2007
Ethylbenzene MR 2 2007
Consumer Confidence Rule Other 2 2016
Tetrachloroethylene MR 2 2007
cis-1,2-Dichloroethylene MR 2 2007
Surface Water Treatment Rule MR 2 2017
Benzene MR 2 2007
CHLOROBENZENE MR 2 2007
Styrene MR 2 2007
Toluene MR 2 2007
Carbon tetrachloride MR 2 2007
1,1-Dichloroethylene MR 2 2007
Trichloroethylene MR 2 2007
1,1,2-Trichloroethane MR 2 2007
DICHLOROMETHANE MR 2 2007
Coliform (TCR) MR 1 1992
Nitrate MCL 1 1993
Gross Alpha, Excl. Radon and U MR 1 1979

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 232 samples detected PFAS.

Contaminant Date Result MRL Status
NEtFOSAA 7/18/2023 <5.00 ppt 5.00 ppt Not Detected
6:2 FTS 7/18/2023 <5.00 ppt 5.00 ppt Not Detected
PFBS 7/18/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 7/18/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 7/18/2023 <3.00 ppt 3.00 ppt Not Detected
PFOS 7/18/2023 <4.00 ppt 4.00 ppt Not Detected
PFDA 7/18/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 7/18/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxA 7/18/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 7/18/2023 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 7/18/2023 <5.00 ppt 5.00 ppt Not Detected
9Cl-PF3ONS 7/18/2023 <2.00 ppt 2.00 ppt Not Detected
ADONA 7/18/2023 <3.00 ppt 3.00 ppt Not Detected
NMeFOSAA 7/18/2023 <6.00 ppt 6.00 ppt Not Detected
PFBA 7/18/2023 <5.00 ppt 5.00 ppt Not Detected
PFNA 7/18/2023 <4.00 ppt 4.00 ppt Not Detected
4:2 FTS 7/18/2023 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 7/18/2023 <5.00 ppt 5.00 ppt Not Detected
PFMPA 7/18/2023 <4.00 ppt 4.00 ppt Not Detected
PFPeA 7/18/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 7/18/2023 <3.00 ppt 3.00 ppt Not Detected
PFEESA 7/18/2023 <3.00 ppt 3.00 ppt Not Detected
NFDHA 7/18/2023 <20.00 ppt 20.00 ppt Not Detected
PFPeS 7/18/2023 <4.00 ppt 4.00 ppt Not Detected
PFHpS 7/18/2023 <3.00 ppt 3.00 ppt Not Detected
PFTrDA 7/18/2023 <7.00 ppt 7.00 ppt Not Detected
HFPO-DA 7/18/2023 <5.00 ppt 5.00 ppt Not Detected
PFTA 7/18/2023 <8.00 ppt 8.00 ppt Not Detected
PFOA 7/18/2023 <4.00 ppt 4.00 ppt Not Detected
PFOA 7/18/2023 <4.00 ppt 4.00 ppt Not Detected
NFDHA 7/18/2023 <20.00 ppt 20.00 ppt Not Detected
8:2 FTS 7/18/2023 <5.00 ppt 5.00 ppt Not Detected
PFMPA 7/18/2023 <4.00 ppt 4.00 ppt Not Detected
PFPeA 7/18/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 7/18/2023 <3.00 ppt 3.00 ppt Not Detected
PFEESA 7/18/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeS 7/18/2023 <4.00 ppt 4.00 ppt Not Detected
PFHpS 7/18/2023 <3.00 ppt 3.00 ppt Not Detected
PFTA 7/18/2023 <8.00 ppt 8.00 ppt Not Detected
PFTrDA 7/18/2023 <7.00 ppt 7.00 ppt Not Detected
NEtFOSAA 7/18/2023 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 7/18/2023 <6.00 ppt 6.00 ppt Not Detected
4:2 FTS 7/18/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 7/18/2023 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 7/18/2023 <5.00 ppt 5.00 ppt Not Detected
PFHxA 7/18/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 7/18/2023 <4.00 ppt 4.00 ppt Not Detected
PFHxS 7/18/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 7/18/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 7/18/2023 <2.00 ppt 2.00 ppt 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 Pasco Water Department.

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 WA5366400 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Washington Drinking Water Authority

Washington State Department of Health, Office of Drinking Water is the primacy agency that licenses and inspects Pasco Water Department under EPA-delegated authority.

Open WA regulator portal

Source: Washington State Department of Health, Office 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 Surface Water Treatment Rule MR 2 SDWIS / WA5366400 / 0200
2016 Consumer Confidence Rule Other 2 SDWIS / WA5366400 / 7000
2007 1,2,4-Trichlorobenzene MR 2 SDWIS / WA5366400 / 2378
2007 o-Dichlorobenzene MR 2 SDWIS / WA5366400 / 2968
2007 p-Dichlorobenzene MR 2 SDWIS / WA5366400 / 2969
2007 Vinyl chloride MR 2 SDWIS / WA5366400 / 2976
2007 trans-1,2-Dichloroethylene MR 2 SDWIS / WA5366400 / 2979
2007 1,2-Dichloroethane MR 2 SDWIS / WA5366400 / 2980
2007 1,1,1-Trichloroethane MR 2 SDWIS / WA5366400 / 2981
2007 1,2-Dichloropropane MR 2 SDWIS / WA5366400 / 2983
2007 Ethylbenzene MR 2 SDWIS / WA5366400 / 2992
2007 Tetrachloroethylene MR 2 SDWIS / WA5366400 / 2987
2007 cis-1,2-Dichloroethylene MR 2 SDWIS / WA5366400 / 2380
2007 Benzene MR 2 SDWIS / WA5366400 / 2990
2007 CHLOROBENZENE MR 2 SDWIS / WA5366400 / 2989

How Pasco Water Department Compares

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

Metric Pasco Water Department Washington avg Federal benchmark
Total violations 62 69 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 4 4.5 Indicates a contaminant exceeded a federal MCL
PFAS detection None 39.7% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 116,342 2,137 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 4,557 regulated public water systems in Washington.

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 Pasco Water Department water safe to drink? ▼
Pasco Water Department (PWS ID: WA5366400) has 62 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 116,342 people using Surface Water sources.
How many people does Pasco Water Department serve? ▼
Pasco Water Department serves 116,342 people in Pasco, Washington. It is a Local-owned system using Surface Water water sources with 29,554 service connections.
What type of violations does Pasco Water Department have? ▼
Pasco Water Department has 62 total violations: 4 health-based violations (MCL exceedances or treatment failures), 56 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Pasco Water Department water? ▼
No. Pasco Water Department was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does Pasco Water Department use? ▼
Pasco Water Department 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. 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.

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.