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States → EPA Region 9 — Tribal Water Systems

Community Water System · PWS 093200163

Duckwater

Operator location Duckwater, EPA Region 9 — Tribal Water Systems - smaller served population (≤ 999) at 166 people served; 225 SDWIS violations on record from groundwater sources.

166
People served (this PWS)
225
EPA violations (this PWS)
19
Health-based (this PWS)
Untested
UCMR5 (this PWS)
Follow published updates (RSS)

Duckwater standing, high SDWIS violation third

166 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 8% is middle-third health share (≤ 23%).

The verdict

Duckwater sits in the upper third of the sitemap cohort by violation count (225), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (166; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 8% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.

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

Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.

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

Violation Count vs. the National Corpus

Duckwater has 225 recorded EPA violations, 87% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 13% carry more. 8% of this system's own violations are health-based (19 of 225), and it ranks unranked by population served among that same cohort.

EPA violations vs. the national water-system corpus

Public water systems serving 500+ people (EPA SDWIS)

225 Higher than most more violations than 87% of 29,740 water systems

the national water-system corpus, bucketed by value

Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.

Source EPA SDWIS · 2026-05-15

Population served record for Duckwater

EPA SDWIS lists 166 people served and 59 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.

EPA SDWIS · PWS 093200163

Sources: EPA SDWIS

Nationwide peers

225 violations · 166 served: nearest cross-state SDWIS matches.

Cross-state systems with comparable violation load

Nearest cross-state community systems (500+ served) by total SDWIS violations on record.

4 peers

What to do with Duckwater

Use this system's EPA-reported record as a starting filter, not a final verdict.

EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater