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SHELTON CITY OF

PWS ID: WA5378170 · SHELTON, Washington 98584

SHELTON CITY OF serves 17,575 people in SHELTON, Washington using Groundwater water sources. It has 108 recorded EPA violations, including 2 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: SHELTON CITY OF

SHELTON CITY OF is a local-owned community water system that delivers drinking water to 17,575 residents in SHELTON, Washington (Mason County) through 4,490 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 108 total violations for this system , of which 2 (2%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 104 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 cis-1,2-Dichloroethylene, recorded in 5 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. SHELTON CITY OF's 108 violations sit above the Washington average. Statewide, 98 of 247 UCMR5-tested systems have reported PFAS detections (39.7%). 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
17,575
Total Violations
108
Health-Based Violations
2
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
4,490
County
Mason
School/Daycare
No
MCL Violations
2
Monitoring Violations
104
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
cis-1,2-Dichloroethylene MR 5 2005
DICHLOROMETHANE MR 5 2005
o-Dichlorobenzene MR 5 2005
p-Dichlorobenzene MR 5 2005
Vinyl chloride MR 5 2005
1,1-Dichloroethylene MR 5 2005
trans-1,2-Dichloroethylene MR 5 2005
1,1,1-Trichloroethane MR 5 2005
Carbon tetrachloride MR 5 2005
1,2-Dichloropropane MR 5 2005
1,1,2-Trichloroethane MR 5 2005
Tetrachloroethylene MR 5 2005
Benzene MR 5 2005
Toluene MR 5 2005
Styrene MR 5 2005
Ethylbenzene MR 5 2005
CHLOROBENZENE MR 5 2005
1,2-Dichloroethane MR 5 2005
Trichloroethylene MR 5 2005
1,2,4-Trichlorobenzene MR 5 2005
Consumer Confidence Rule Other 2 2017
Coliform (TCR) MCL 2 2003
Coliform (TCR) MR 2 1991
Diquat MR 1 2008
Gross Alpha, Excl. Radon and U MR 1 1979

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 180 samples detected PFAS.

Contaminant Date Result MRL Status
NMeFOSAA 6/11/2025 <0.006 µg/L 0.006 µg/L Not Detected
PFTrDA 6/11/2025 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 6/11/2025 <0.008 µg/L 0.008 µg/L Not Detected
lithium 6/11/2025 <9 µg/L 9 µg/L Not Detected
PFDoA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 6/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 6/11/2025 <0.004 µg/L 0.004 µg/L Not Detected
HFPO-DA 6/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 6/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 6/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
ADONA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
NEtFOSAA 6/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFHpA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 6/11/2025 <0.002 µg/L 0.002 µg/L Not Detected
9Cl-PF3ONS 6/11/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFPeA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 6/11/2025 <0.02 µg/L 0.02 µg/L Not Detected
PFHpS 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 6/11/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 6/11/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFHxA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 6/11/2025 <0.004 µg/L 0.004 µg/L Not Detected
11Cl-PF3OUdS 6/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFNA 6/11/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
NEtFOSAA 6/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFBS 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHpS 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 6/11/2025 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 6/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 6/11/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFHpA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFTA 6/11/2025 <0.008 µg/L 0.008 µg/L Not Detected
PFHxA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
NMeFOSAA 6/11/2025 <0.006 µg/L 0.006 µg/L Not Detected
PFDoA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 6/11/2025 <0.004 µg/L 0.004 µg/L Not Detected
lithium 6/11/2025 <9 µg/L 9 µg/L Not Detected
NFDHA 6/11/2025 <0.02 µg/L 0.02 µg/L Not Detected
PFTrDA 6/11/2025 <0.007 µg/L 0.007 µg/L Not Detected
PFPeS 6/11/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 6/11/2025 <0.003 µg/L 0.003 µg/L 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 SHELTON 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 WA5378170 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 SHELTON 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
2017 Consumer Confidence Rule Other 2 SDWIS / WA5378170 / 7000
2008 Diquat MR 1 SDWIS / WA5378170 / 2032
2005 cis-1,2-Dichloroethylene MR 5 SDWIS / WA5378170 / 2380
2005 DICHLOROMETHANE MR 5 SDWIS / WA5378170 / 2964
2005 o-Dichlorobenzene MR 5 SDWIS / WA5378170 / 2968
2005 p-Dichlorobenzene MR 5 SDWIS / WA5378170 / 2969
2005 Vinyl chloride MR 5 SDWIS / WA5378170 / 2976
2005 1,1-Dichloroethylene MR 5 SDWIS / WA5378170 / 2977
2005 trans-1,2-Dichloroethylene MR 5 SDWIS / WA5378170 / 2979
2005 1,1,1-Trichloroethane MR 5 SDWIS / WA5378170 / 2981
2005 Carbon tetrachloride MR 5 SDWIS / WA5378170 / 2982
2005 1,2-Dichloropropane MR 5 SDWIS / WA5378170 / 2983
2005 1,1,2-Trichloroethane MR 5 SDWIS / WA5378170 / 2985
2005 Tetrachloroethylene MR 5 SDWIS / WA5378170 / 2987
2005 Benzene MR 5 SDWIS / WA5378170 / 2990

How SHELTON CITY OF Compares

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

Metric SHELTON CITY OF Washington avg Federal benchmark
Total violations 108 69 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 2 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 17,575 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
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is SHELTON CITY OF water safe to drink? ▼
SHELTON CITY OF (PWS ID: WA5378170) has 108 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 17,575 people using Groundwater sources.
How many people does SHELTON CITY OF serve? ▼
SHELTON CITY OF serves 17,575 people in SHELTON, Washington. It is a Local-owned system using Groundwater water sources with 4,490 service connections.
What type of violations does SHELTON CITY OF have? ▼
SHELTON CITY OF has 108 total violations: 2 health-based violations (MCL exceedances or treatment failures), 104 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in SHELTON CITY OF water? ▼
No. SHELTON CITY OF was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does SHELTON CITY OF use? ▼
SHELTON 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.

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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.

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Data sourced from $official public datasets. See our methodology for details. Retrieved and formatted by PlainWater Editorial