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SHOALWATER BAY

PWS ID: 105300019 · TOKELAND, 10 98590

SHOALWATER BAY serves 198 people in TOKELAND, 10 using Groundwater water sources. It has 61 recorded EPA violations, including 2 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: SHOALWATER BAY

SHOALWATER BAY is a native american-owned community water system that delivers drinking water to 198 residents in TOKELAND, 10 through 57 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 61 total violations for this system , of which 2 (3%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 46 monitoring and reporting violations are on file. The most recent violation on record dates to 2021.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 13 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 10, EPA tracks 158 public water systems serving 142,574 people, with 31,953 cumulative violations and 1,055 health-based violations on record. About 98% of systems in the state carry at least one violation, and state-wide the average per system is 202.2 violations. SHOALWATER BAY's 61 violations sit below the 10 average. Statewide, 2 of 10 UCMR5-tested systems have reported PFAS detections (20%). 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
198
Total Violations
61
Health-Based Violations
2
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
57
School/Daycare
No
MCL Violations
2
Monitoring Violations
46
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 13 2011
Chlorine MR 12 2016
Consumer Confidence Rule Other 11 2020
Combined Radium (-226 and -228) MR 3 2011
Lead and Copper Rule MR 3 2021
Nitrate MR 2 2005
Coliform (TCR) MCL 2 2014
Gross Alpha, Excl. Radon and U MR 2 2008
Total Haloacetic Acids (HAA5) MR 2 2020
TTHM MR 2 2020
Total Polychlorinated Biphenyls (PCB) MR 1 2008
2,3,7,8-TCDD MR 1 2008
Glyphosate MR 1 2008
Diquat MR 1 2008
Combined Uranium MR 1 2008
E. COLI MR 1 2019
Endothall MR 1 2008

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 60 samples detected PFAS.

Contaminant Date Result MRL Status
9Cl-PF3ONS 8/19/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFDA 8/19/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 8/19/2024 <0.004 µg/L 0.004 µg/L Not Detected
NFDHA 8/19/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFEESA 8/19/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 8/19/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 8/19/2024 <0.004 µg/L 0.004 µg/L Not Detected
4:2 FTS 8/19/2024 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 8/19/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 8/19/2024 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 8/19/2024 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 8/19/2024 <0.003 µg/L 0.003 µg/L Not Detected
11Cl-PF3OUdS 8/19/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFHpS 8/19/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 8/19/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 8/19/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 8/19/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 8/19/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 8/19/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 8/19/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 8/19/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 8/19/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 8/19/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 8/19/2024 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 8/19/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 5/1/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 5/1/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 5/1/2023 <0.003 µg/L 0.003 µg/L Not Detected
4:2 FTS 5/1/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 5/1/2023 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 5/1/2023 <0.005 µg/L 0.005 µg/L Not Detected
NEtFOSAA 5/1/2023 <0.005 µg/L 0.005 µg/L Not Detected
NFDHA 5/1/2023 <0.02 µg/L 0.02 µg/L Not Detected
PFTrDA 5/1/2023 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 5/1/2023 <0.008 µg/L 0.008 µg/L Not Detected
lithium 5/1/2023 <9 µg/L 9 µg/L Not Detected
NMeFOSAA 5/1/2023 <0.006 µg/L 0.006 µg/L Not Detected
PFNA 5/1/2023 <0.004 µg/L 0.004 µg/L Not Detected
ADONA 5/1/2023 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 5/1/2023 <0.005 µg/L 0.005 µg/L Not Detected
11Cl-PF3OUdS 5/1/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 5/1/2023 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 5/1/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 5/1/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 5/1/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 5/1/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFOS 5/1/2023 <0.004 µg/L 0.004 µg/L Not Detected
9Cl-PF3ONS 5/1/2023 <0.002 µg/L 0.002 µg/L Not Detected
PFHxS 5/1/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 5/1/2023 <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 SHOALWATER BAY.

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 105300019 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

10 Drinking Water Authority

10'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
2021 Lead and Copper Rule MR 3 SDWIS / 105300019 / 5000
2020 Consumer Confidence Rule Other 11 SDWIS / 105300019 / 7000
2020 Total Haloacetic Acids (HAA5) MR 2 SDWIS / 105300019 / 2456
2020 TTHM MR 2 SDWIS / 105300019 / 2950
2019 E. COLI MR 1 SDWIS / 105300019 / 3014
2016 Chlorine MR 12 SDWIS / 105300019 / 0999
2014 Coliform (TCR) MCL 2 SDWIS / 105300019 / 3100
2011 Coliform (TCR) MR 13 SDWIS / 105300019 / 3100
2011 Combined Radium (-226 and -228) MR 3 SDWIS / 105300019 / 4010
2008 Gross Alpha, Excl. Radon and U MR 2 SDWIS / 105300019 / 4000
2008 Total Polychlorinated Biphenyls (PCB) MR 1 SDWIS / 105300019 / 2383
2008 2,3,7,8-TCDD MR 1 SDWIS / 105300019 / 2063
2008 Glyphosate MR 1 SDWIS / 105300019 / 2034
2008 Diquat MR 1 SDWIS / 105300019 / 2032
2008 Combined Uranium MR 1 SDWIS / 105300019 / 4006

How SHOALWATER BAY Compares

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

Metric SHOALWATER BAY 10 avg Federal benchmark
Total violations 61 202.2 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 2 6.7 Indicates a contaminant exceeded a federal MCL
PFAS detection None 20% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 198 902 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 158 regulated public water systems in 10.

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 SHOALWATER BAY water safe to drink? ▼
SHOALWATER BAY (PWS ID: 105300019) has 61 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 198 people using Groundwater sources.
How many people does SHOALWATER BAY serve? ▼
SHOALWATER BAY serves 198 people in TOKELAND, 10. It is a Native American-owned system using Groundwater water sources with 57 service connections.
What type of violations does SHOALWATER BAY have? ▼
SHOALWATER BAY has 61 total violations: 2 health-based violations (MCL exceedances or treatment failures), 46 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in SHOALWATER BAY water? ▼
No. SHOALWATER BAY was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does SHOALWATER BAY use? ▼
SHOALWATER BAY 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