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States → EPA Region 10 — Tribal Water Systems

Community Water System · PWS 105300015

Port Gamble Sklallam

Kingston, EPA Region 10 — Tribal Water Systems 98346 - drinking water served from groundwater sources to 1,509 people, tracked in EPA SDWIS and UCMR5.

1,509
People served
105
EPA violations
12
Health-based
Untested
UCMR5 result

The verdict

EPA records 105 drinking-water violations at Port Gamble Sklallam, 11% of them health-based.

105
Total EPA violations on record
11%
Health-based (MCL / treatment failure)
1,509
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Port Gamble Sklallam

Port Gamble Sklallam is a native american-owned community water system that delivers drinking water to 1,509 residents in Kingston, EPA Region 10 — Tribal Water Systems through 228 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 105 total violations for this system , of which 12 (11%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 81 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 37 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
1,509
Total Violations
105
Health-Based Violations
12
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
228
School/Daycare
No
MCL Violations
12
Monitoring Violations
81
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 37 2011
Chlorine MR 18 2018
Coliform (TCR) MCL 12 2010
Consumer Confidence Rule Other 6 2015
Gross Alpha, Excl. Radon and U MR 3 2014
Lead and Copper Rule MR 3 2017
Nitrate MR 3 2014
Combined Radium (-226 and -228) MR 3 2014
Combined Uranium MR 2 2014
TTHM MR 2 2024
Total Haloacetic Acids (HAA5) MR 2 2024
1,2-DIBROMO-3-CHLOROPROPANE MR 1 2008
2,3,7,8-TCDD MR 1 2008
Glyphosate MR 1 2008
Endothall MR 1 2008
Diquat MR 1 2008
ETHYLENE DIBROMIDE MR 1 2008
Revised Total Coliform Rule MON 1 2018
Asbestos MR 1 2008

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 Port Gamble Sklallam.

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 105300015 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
2024 TTHM MR 2 SDWIS / 105300015 / 2950
2024 Total Haloacetic Acids (HAA5) MR 2 SDWIS / 105300015 / 2456
2018 Chlorine MR 18 SDWIS / 105300015 / 0999
2018 Revised Total Coliform Rule MON 1 SDWIS / 105300015 / 8000
2017 Lead and Copper Rule MR 3 SDWIS / 105300015 / 5000
2015 Consumer Confidence Rule Other 6 SDWIS / 105300015 / 7000
2014 Gross Alpha, Excl. Radon and U MR 3 SDWIS / 105300015 / 4000
2014 Nitrate MR 3 SDWIS / 105300015 / 1040
2014 Combined Radium (-226 and -228) MR 3 SDWIS / 105300015 / 4010
2014 Combined Uranium MR 2 SDWIS / 105300015 / 4006
2011 Coliform (TCR) MR 37 SDWIS / 105300015 / 3100
2010 Coliform (TCR) MCL 12 SDWIS / 105300015 / 3100
2008 1,2-DIBROMO-3-CHLOROPROPANE MR 1 SDWIS / 105300015 / 2931
2008 2,3,7,8-TCDD MR 1 SDWIS / 105300015 / 2063
2008 Glyphosate MR 1 SDWIS / 105300015 / 2034

How Port Gamble Sklallam Compares

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

Metric Port Gamble Sklallam EPA Region 10 — Tribal Water Systems avg Federal benchmark
Total violations 105 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 12 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 1,509 - 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 Port Gamble Sklallam water safe to drink? ▼
Port Gamble Sklallam (PWS ID: 105300015) has 105 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,509 people using Groundwater sources.
How many people does Port Gamble Sklallam serve? ▼
Port Gamble Sklallam serves 1,509 people in Kingston, EPA Region 10 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 228 service connections.
What type of violations does Port Gamble Sklallam have? ▼
Port Gamble Sklallam has 105 total violations: 12 health-based violations (MCL exceedances or treatment failures), 81 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Port Gamble Sklallam water? ▼
No PFAS testing data is available for Port Gamble Sklallam under the EPA's UCMR5 monitoring program.
What water source does Port Gamble Sklallam use? ▼
Port Gamble Sklallam 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.