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Community Water System · PWS WA5349650

Mabton City Of

Mabton, Washington 98935 - drinking water served from groundwater sources to 2,150 people, tracked in EPA SDWIS and UCMR5.

2,150
People served
172
EPA violations
1
Health-based
Untested
UCMR5 result

The verdict

EPA records 172 drinking-water violations at Mabton City Of, 1% of them health-based - above the Washington per-system average.

172
Total EPA violations on record
1%
Health-based (MCL / treatment failure)
2,150
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Mabton City Of

Mabton City Of is a local-owned community water system that delivers drinking water to 2,150 residents in Mabton, Washington (Yakima County) through 636 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 172 total violations for this system , of which 1 (1%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 171 monitoring and reporting violations are on file. The most recent violation on record dates to 2022.

The most frequently cited contaminant at this system is Lead and Copper Rule, recorded in 34 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 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%).

Mabton City Of's 172 violations sit above 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
2,150
Total Violations
172
Health-Based Violations
1
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
636
County
Yakima
School/Daycare
No
MCL Violations
1
Monitoring Violations
171
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 34 2006
Revised Total Coliform Rule MON 6 2022
Arsenic MR 5 2019
Nitrate MR 5 2018
Coliform (TCR) MR 4 2015
Pentachlorophenol MR 4 2002
Barium MR 4 2005
Cadmium MR 4 2005
Mercury MR 4 2005
Chromium MR 4 2005
Fluoride MR 4 2005
Selenium MR 4 2005
Thallium, Total MR 3 2005
Beryllium, Total MR 3 2005
CYANIDE MR 3 2005
Nickel MR 3 2005
Antimony, Total MR 3 2005
Dalapon MR 2 2002
2,4,5-TP MR 2 2002
Aldicarb sulfone MR 2 2002
Aldicarb MR 2 2002
Endrin MR 2 2002
Methoxychlor MR 2 2002
Toxaphene MR 2 2002
Di(2-ethylhexyl) adipate MR 2 2002
Simazine MR 2 2002
Di(2-ethylhexyl) phthalate MR 2 2002
Atrazine MR 2 2002
LASSO MR 2 2002
Heptachlor MR 2 2002

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 Mabton City Of.

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 WA5349650 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 Mabton City Of 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
2022 Revised Total Coliform Rule MON 6 SDWIS / WA5349650 / 8000
2019 Arsenic MR 5 SDWIS / WA5349650 / 1005
2018 Nitrate MR 5 SDWIS / WA5349650 / 1040
2016 TTHM MR 1 SDWIS / WA5349650 / 2950
2016 Total Haloacetic Acids (HAA5) MR 1 SDWIS / WA5349650 / 2456
2015 Coliform (TCR) MR 4 SDWIS / WA5349650 / 3100
2008 1,2-DIBROMO-3-CHLOROPROPANE MR 1 SDWIS / WA5349650 / 2931
2008 Diquat MR 1 SDWIS / WA5349650 / 2032
2008 ETHYLENE DIBROMIDE MR 1 SDWIS / WA5349650 / 2946
2006 Lead and Copper Rule MR 34 SDWIS / WA5349650 / 5000
2005 Barium MR 4 SDWIS / WA5349650 / 1010
2005 Cadmium MR 4 SDWIS / WA5349650 / 1015
2005 Mercury MR 4 SDWIS / WA5349650 / 1035
2005 Chromium MR 4 SDWIS / WA5349650 / 1020
2005 Fluoride MR 4 SDWIS / WA5349650 / 1025

How Mabton City Of Compares

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

Metric Mabton City Of Washington avg Federal benchmark
Total violations 172 69 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 1 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 2,150 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 Mabton City Of water safe to drink? ▼
Mabton City Of (PWS ID: WA5349650) has 172 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 2,150 people using Groundwater sources.
How many people does Mabton City Of serve? ▼
Mabton City Of serves 2,150 people in Mabton, Washington. It is a Local-owned system using Groundwater water sources with 636 service connections.
What type of violations does Mabton City Of have? ▼
Mabton City Of has 172 total violations: 1 health-based violations (MCL exceedances or treatment failures), 171 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Mabton City Of water? ▼
No PFAS testing data is available for Mabton City Of under the EPA's UCMR5 monitoring program.
What water source does Mabton City Of use? ▼
Mabton City Of 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.
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.