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States → EPA Region 10 — Tribal Water Systems

Community Water System · PWS 105300020

Skokomish

Skokomish Nation, EPA Region 10 — Tribal Water Systems 98584 - drinking water served from groundwater sources to 1,150 people, tracked in EPA SDWIS and UCMR5.

1,150
People served
532
EPA violations
5
Health-based
Untested
UCMR5 result

The verdict

EPA records 532 drinking-water violations at Skokomish, 1% of them health-based.

532
Total EPA violations on record
1%
Health-based (MCL / treatment failure)
1,150
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Skokomish

Skokomish is a native american-owned community water system that delivers drinking water to 1,150 residents in Skokomish Nation, EPA Region 10 — Tribal Water Systems through 115 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 532 total violations for this system , of which 5 (1%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 506 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 46 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

EPA Region 10 — Tribal Water Systems has thousands of regulated public water systems tracked by EPA under the Safe Drinking Water Act.

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
1,150
Total Violations
532
Health-Based Violations
5
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
115
School/Daycare
No
MCL Violations
5
Monitoring Violations
506
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 46 2009
Consumer Confidence Rule Other 19 2024
Endothall MR 11 2008
Glyphosate MR 11 2008
Atrazine MR 11 2002
2,3,7,8-TCDD MR 11 2008
ETHYLENE DIBROMIDE MR 11 2008
1,2-DIBROMO-3-CHLOROPROPANE MR 11 2008
Diquat MR 11 2008
Endrin MR 10 1996
BHC-GAMMA MR 10 1996
Methoxychlor MR 10 1996
Dalapon MR 10 1996
Di(2-ethylhexyl) adipate MR 10 1996
Di(2-ethylhexyl) phthalate MR 10 1996
Picloram MR 10 1996
Dinoseb MR 10 1996
Hexachlorocyclopentadiene MR 10 1996
Carbofuran MR 10 1996
LASSO MR 10 1996
2,4-D MR 10 1996
2,4,5-TP MR 10 1996
Pentachlorophenol MR 10 1996
Chlordane MR 10 1996
Benzo(a)pyrene MR 10 1996
HEXACHLOROBENZENE MR 10 1996
Simazine MR 10 1996
Toxaphene MR 10 1996
Heptachlor MR 10 1996
Heptachlor epoxide MR 10 1996

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 Skokomish.

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 105300020 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

EPA Region 10 — Tribal Water Systems Drinking Water Authority

EPA Region 10 — Tribal Water Systems's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find 10 regulator via EPA SDWIS

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
2025 TTHM MR 7 SDWIS / 105300020 / 2950
2025 Total Haloacetic Acids (HAA5) MR 7 SDWIS / 105300020 / 2456
2025 Chlorine MR 5 SDWIS / 105300020 / 0999
2025 Revised Total Coliform Rule MON 3 SDWIS / 105300020 / 8000
2024 Consumer Confidence Rule Other 19 SDWIS / 105300020 / 7000
2022 Lead and Copper Rule MR 3 SDWIS / 105300020 / 5000
2021 Revised Total Coliform Rule RPT 1 SDWIS / 105300020 / 8000
2014 Combined Radium (-226 and -228) MR 3 SDWIS / 105300020 / 4010
2014 Combined Uranium MR 2 SDWIS / 105300020 / 4006
2012 Nitrate MR 8 SDWIS / 105300020 / 1040
2011 Gross Alpha, Excl. Radon and U MR 7 SDWIS / 105300020 / 4000
2009 Coliform (TCR) MR 46 SDWIS / 105300020 / 3100
2008 Endothall MR 11 SDWIS / 105300020 / 2033
2008 Glyphosate MR 11 SDWIS / 105300020 / 2034
2008 2,3,7,8-TCDD MR 11 SDWIS / 105300020 / 2063

How Skokomish Compares

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

Metric Skokomish EPA Region 10 — Tribal Water Systems avg Federal benchmark
Total violations 532 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 5 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 1,150 - Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across all regulated public water systems in EPA Region 10 — Tribal Water Systems.

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 Skokomish water safe to drink? ▼
Skokomish (PWS ID: 105300020) has 532 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,150 people using Groundwater sources.
How many people does Skokomish serve? ▼
Skokomish serves 1,150 people in Skokomish Nation, EPA Region 10 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 115 service connections.
What type of violations does Skokomish have? ▼
Skokomish has 532 total violations: 5 health-based violations (MCL exceedances or treatment failures), 506 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Skokomish water? ▼
No PFAS testing data is available for Skokomish under the EPA's UCMR5 monitoring program.
What water source does Skokomish use? ▼
Skokomish 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.