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States → EPA Region 10 — Tribal Water Systems

Community Water System · PWS 105300003

Tulalip Bay Water Dist #1

Tulalip, EPA Region 10 — Tribal Water Systems 98271 - drinking water served from surface water sources to 5,968 people, tracked in EPA SDWIS and UCMR5.

5,968
People served
248
EPA violations
5
Health-based
No PFAS
UCMR5 result

The verdict

EPA records 248 drinking-water violations at Tulalip Bay Water Dist #1, 2% of them health-based.

248
Total EPA violations on record
2%
Health-based (MCL / treatment failure)
5,968
People served by this system
0
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Tulalip Bay Water Dist #1

Tulalip Bay Water Dist #1 is a native american-owned community water system that delivers drinking water to 5,968 residents in Tulalip, EPA Region 10 — Tribal Water Systems through 1,908 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 248 total violations for this system , of which 5 (2%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 232 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 41 violations (MR). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

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
5,968
Total Violations
248
Health-Based Violations
5
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Native American
Connections
1,908
School/Daycare
No
MCL Violations
5
Monitoring Violations
232
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 41 2014
Chlorine MR 12 2018
Nitrate MR 12 2019
Consumer Confidence Rule Other 6 2015
Coliform (TCR) MCL 5 2010
Combined Radium (-226 and -228) MR 5 2008
Gross Alpha, Excl. Radon and U MR 5 2008
Toluene MR 4 2011
Combined Uranium MR 4 2008
Atrazine MR 3 2008
Barium MR 3 2008
CYANIDE MR 3 2008
Nickel MR 3 2008
Beryllium, Total MR 3 2008
Asbestos MR 3 2008
Selenium MR 3 2008
TTHM MR 3 2024
Cadmium MR 3 2008
Chromium MR 3 2008
Antimony, Total MR 3 2008
Thallium, Total MR 3 2008
Fluoride MR 3 2008
Mercury MR 3 2008
Arsenic MR 3 2008
Benzene MR 3 2008
Trichloroethylene MR 2 2008
1,1,2-Trichloroethane MR 2 2008
Tetrachloroethylene MR 2 2008
Styrene MR 2 2008
Toxaphene MR 2 2008

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 116 samples detected PFAS.

Contaminant Date Result MRL Status
HFPO-DA 9/13/2023 <5.00 ppt 5.00 ppt Not Detected
11Cl-PF3OUdS 9/13/2023 <5.00 ppt 5.00 ppt Not Detected
PFHxS 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 9/13/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 9/13/2023 <4.00 ppt 4.00 ppt Not Detected
PFOA 9/13/2023 <4.00 ppt 4.00 ppt Not Detected
PFDoA 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 9/13/2023 <2.00 ppt 2.00 ppt Not Detected
PFPeA 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
NMeFOSAA 9/13/2023 <6.00 ppt 6.00 ppt Not Detected
NEtFOSAA 9/13/2023 <5.00 ppt 5.00 ppt Not Detected
PFTrDA 9/13/2023 <7.00 ppt 7.00 ppt Not Detected
PFTA 9/13/2023 <8.00 ppt 8.00 ppt Not Detected
PFHpS 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeS 9/13/2023 <4.00 ppt 4.00 ppt Not Detected
NFDHA 9/13/2023 <20.00 ppt 20.00 ppt Not Detected
9Cl-PF3ONS 9/13/2023 <2.00 ppt 2.00 ppt Not Detected
PFMBA 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFMPA 9/13/2023 <4.00 ppt 4.00 ppt Not Detected
8:2 FTS 9/13/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 9/13/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 9/13/2023 <5.00 ppt 5.00 ppt Not Detected
PFDA 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
ADONA 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFEESA 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxA 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
NFDHA 6/5/2023 <20.00 ppt 20.00 ppt Not Detected
PFUnA 6/5/2023 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 6/5/2023 <5.00 ppt 5.00 ppt Not Detected
9Cl-PF3ONS 6/5/2023 <2.00 ppt 2.00 ppt Not Detected
ADONA 6/5/2023 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 6/5/2023 <5.00 ppt 5.00 ppt Not Detected
6:2 FTS 6/5/2023 <5.00 ppt 5.00 ppt Not Detected
8:2 FTS 6/5/2023 <5.00 ppt 5.00 ppt Not Detected
PFMPA 6/5/2023 <4.00 ppt 4.00 ppt Not Detected
PFHpS 6/5/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 6/5/2023 <3.00 ppt 3.00 ppt Not Detected
PFBA 6/5/2023 <5.00 ppt 5.00 ppt Not Detected
PFPeS 6/5/2023 <4.00 ppt 4.00 ppt Not Detected
PFEESA 6/5/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxA 6/5/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeA 6/5/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 6/5/2023 <3.00 ppt 3.00 ppt Not Detected
4:2 FTS 6/5/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 6/5/2023 <3.00 ppt 3.00 ppt Not Detected
PFDA 6/5/2023 <3.00 ppt 3.00 ppt Not Detected
PFOA 6/5/2023 <4.00 ppt 4.00 ppt 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 Tulalip Bay Water Dist #1.

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 105300003 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 3 SDWIS / 105300003 / 2950
2024 Total Haloacetic Acids (HAA5) MR 2 SDWIS / 105300003 / 2456
2019 Nitrate MR 12 SDWIS / 105300003 / 1040
2018 Chlorine MR 12 SDWIS / 105300003 / 0999
2017 Revised Total Coliform Rule RPT 1 SDWIS / 105300003 / 8000
2017 Revised Total Coliform Rule MON 1 SDWIS / 105300003 / 8000
2015 Consumer Confidence Rule Other 6 SDWIS / 105300003 / 7000
2014 Coliform (TCR) MR 41 SDWIS / 105300003 / 3100
2013 Lead and Copper Rule MR 2 SDWIS / 105300003 / 5000
2011 Toluene MR 4 SDWIS / 105300003 / 2991
2010 Coliform (TCR) MCL 5 SDWIS / 105300003 / 3100
2008 Combined Radium (-226 and -228) MR 5 SDWIS / 105300003 / 4010
2008 Gross Alpha, Excl. Radon and U MR 5 SDWIS / 105300003 / 4000
2008 Combined Uranium MR 4 SDWIS / 105300003 / 4006
2008 Atrazine MR 3 SDWIS / 105300003 / 2050

How Tulalip Bay Water Dist #1 Compares

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

Metric Tulalip Bay Water Dist #1 EPA Region 10 — Tribal Water Systems avg Federal benchmark
Total violations 248 - 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 5,968 - 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 Tulalip Bay Water Dist #1 water safe to drink? ▼
Tulalip Bay Water Dist #1 (PWS ID: 105300003) has 248 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 5,968 people using Surface Water sources.
How many people does Tulalip Bay Water Dist #1 serve? ▼
Tulalip Bay Water Dist #1 serves 5,968 people in Tulalip, EPA Region 10 — Tribal Water Systems. It is a Native American-owned system using Surface Water water sources with 1,908 service connections.
What type of violations does Tulalip Bay Water Dist #1 have? ▼
Tulalip Bay Water Dist #1 has 248 total violations: 5 health-based violations (MCL exceedances or treatment failures), 232 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Tulalip Bay Water Dist #1 water? ▼
No. Tulalip Bay Water Dist #1 was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does Tulalip Bay Water Dist #1 use? ▼
Tulalip Bay Water Dist #1 uses Surface Water 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. 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.

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.