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States → EPA Region 9 — Tribal Water Systems

Community Water System · PWS 093200163

Duckwater

Duckwater, EPA Region 9 — Tribal Water Systems 89314 - drinking water served from groundwater sources to 166 people, tracked in EPA SDWIS and UCMR5.

166
People served
225
EPA violations
19
Health-based
Untested
UCMR5 result

The verdict

EPA records 225 drinking-water violations at Duckwater, 8% of them health-based.

225
Total EPA violations on record
8%
Health-based (MCL / treatment failure)
166
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Duckwater

Duckwater is a native american-owned community water system that delivers drinking water to 166 residents in Duckwater, EPA Region 9 — Tribal Water Systems through 59 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 225 total violations for this system , of which 19 (8%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 155 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 33 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 9 — 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
166
Total Violations
225
Health-Based Violations
19
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
59
School/Daycare
No
MCL Violations
6
Monitoring Violations
155
Treatment Tech Violations
13

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 33 2015
Nitrate MR 13 2024
Groundwater Rule TT 13 2024
Consumer Confidence Rule Other 10 2023
Chlorine MR 9 2025
Coliform (TCR) MCL 6 2006
Endrin MR 2 2020
BHC-GAMMA MR 2 2020
Methoxychlor MR 2 2020
Toxaphene MR 2 2020
Diquat MR 2 2020
Endothall MR 2 2020
Glyphosate MR 2 2020
Di(2-ethylhexyl) adipate MR 2 2020
OXAMYL MR 2 2020
Simazine MR 2 2020
Di(2-ethylhexyl) phthalate MR 2 2020
Picloram MR 2 2020
Dinoseb MR 2 2020
Hexachlorocyclopentadiene MR 2 2020
Carbofuran MR 2 2020
Atrazine MR 2 2020
LASSO MR 2 2020
2,3,7,8-TCDD MR 2 2014
Heptachlor MR 2 2020
Heptachlor epoxide MR 2 2020
2,4,5-TP MR 2 2020
Benzo(a)pyrene MR 2 2020
Pentachlorophenol MR 2 2020
Total Polychlorinated Biphenyls (PCB) MR 2 2020

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 Duckwater.

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 093200163 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

EPA Region 9 — Tribal Water Systems Drinking Water Authority

EPA Region 9 — 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 09 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 Chlorine MR 9 SDWIS / 093200163 / 0999
2024 Nitrate MR 13 SDWIS / 093200163 / 1040
2024 Groundwater Rule TT 13 SDWIS / 093200163 / 0700
2023 Consumer Confidence Rule Other 10 SDWIS / 093200163 / 7000
2023 Revised Total Coliform Rule RPT 1 SDWIS / 093200163 / 8000
2020 Endrin MR 2 SDWIS / 093200163 / 2005
2020 BHC-GAMMA MR 2 SDWIS / 093200163 / 2010
2020 Methoxychlor MR 2 SDWIS / 093200163 / 2015
2020 Toxaphene MR 2 SDWIS / 093200163 / 2020
2020 Diquat MR 2 SDWIS / 093200163 / 2032
2020 Endothall MR 2 SDWIS / 093200163 / 2033
2020 Glyphosate MR 2 SDWIS / 093200163 / 2034
2020 Di(2-ethylhexyl) adipate MR 2 SDWIS / 093200163 / 2035
2020 OXAMYL MR 2 SDWIS / 093200163 / 2036
2020 Simazine MR 2 SDWIS / 093200163 / 2037

How Duckwater Compares

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

Metric Duckwater EPA Region 9 — Tribal Water Systems avg Federal benchmark
Total violations 225 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 19 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 166 - 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 9 — 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 Duckwater water safe to drink? ▼
Duckwater (PWS ID: 093200163) has 225 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 166 people using Groundwater sources.
How many people does Duckwater serve? ▼
Duckwater serves 166 people in Duckwater, EPA Region 9 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 59 service connections.
What type of violations does Duckwater have? ▼
Duckwater has 225 total violations: 19 health-based violations (MCL exceedances or treatment failures), 155 monitoring/reporting violations, and 13 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Duckwater water? ▼
No PFAS testing data is available for Duckwater under the EPA's UCMR5 monitoring program.
What water source does Duckwater use? ▼
Duckwater 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.