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States → EPA Region 8 — Tribal Water Systems

Community Water System · PWS 083090044

Hays/White Cow Canyon WS

Harlem, EPA Region 8 — Tribal Water Systems 59526 - drinking water served from groundwater sources to 840 people, tracked in EPA SDWIS and UCMR5.

840
People served
158
EPA violations
15
Health-based
Untested
UCMR5 result

The verdict

EPA records 158 drinking-water violations at Hays/White Cow Canyon WS, 9% of them health-based.

158
Total EPA violations on record
9%
Health-based (MCL / treatment failure)
840
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Hays/White Cow Canyon WS

Hays/White Cow Canyon WS is a native american-owned community water system that delivers drinking water to 840 residents in Harlem, EPA Region 8 — Tribal Water Systems through 150 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 158 total violations for this system , of which 15 (9%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 140 monitoring and reporting violations are on file. The most recent violation on record dates to 2019.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 29 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 8 — 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
840
Total Violations
158
Health-Based Violations
15
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
150
School/Daycare
No
MCL Violations
14
Monitoring Violations
140
Treatment Tech Violations
1

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 29 2009
Coliform (TCR) MCL 14 2009
Di(2-ethylhexyl) phthalate MR 3 2008
Nitrate MR 2 2008
1,2,4-Trichlorobenzene MR 2 2008
cis-1,2-Dichloroethylene MR 2 2008
o-Dichlorobenzene MR 2 2008
p-Dichlorobenzene MR 2 2008
1,1-Dichloroethylene MR 2 2008
1,2-Dichloroethane MR 2 2008
1,1,1-Trichloroethane MR 2 2008
Carbon tetrachloride MR 2 2008
1,2-Dichloropropane MR 2 2008
Tetrachloroethylene MR 2 2008
Benzene MR 2 2008
Toluene MR 2 2008
Ethylbenzene MR 2 2008
Styrene MR 2 2008
Methoxychlor MR 2 2008
BHC-GAMMA MR 2 2008
Diquat MR 2 2008
Endothall MR 2 2008
Glyphosate MR 2 2008
Di(2-ethylhexyl) adipate MR 2 2008
Simazine MR 2 2008
Dinoseb MR 2 2008
Hexachlorocyclopentadiene MR 2 2008
Carbofuran MR 2 2008
Heptachlor MR 2 2008
HEXACHLOROBENZENE MR 2 2008

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 Hays/White Cow Canyon WS.

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 083090044 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

EPA Region 8 — Tribal Water Systems Drinking Water Authority

EPA Region 8 — 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 08 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
2019 Groundwater Rule TT 1 SDWIS / 083090044 / 0700
2009 Coliform (TCR) MR 29 SDWIS / 083090044 / 3100
2009 Coliform (TCR) MCL 14 SDWIS / 083090044 / 3100
2008 Di(2-ethylhexyl) phthalate MR 3 SDWIS / 083090044 / 2039
2008 Nitrate MR 2 SDWIS / 083090044 / 1040
2008 1,2,4-Trichlorobenzene MR 2 SDWIS / 083090044 / 2378
2008 cis-1,2-Dichloroethylene MR 2 SDWIS / 083090044 / 2380
2008 o-Dichlorobenzene MR 2 SDWIS / 083090044 / 2968
2008 p-Dichlorobenzene MR 2 SDWIS / 083090044 / 2969
2008 1,1-Dichloroethylene MR 2 SDWIS / 083090044 / 2977
2008 1,2-Dichloroethane MR 2 SDWIS / 083090044 / 2980
2008 1,1,1-Trichloroethane MR 2 SDWIS / 083090044 / 2981
2008 Carbon tetrachloride MR 2 SDWIS / 083090044 / 2982
2008 1,2-Dichloropropane MR 2 SDWIS / 083090044 / 2983
2008 Tetrachloroethylene MR 2 SDWIS / 083090044 / 2987

How Hays/White Cow Canyon WS Compares

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

Metric Hays/White Cow Canyon WS EPA Region 8 — Tribal Water Systems avg Federal benchmark
Total violations 158 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 15 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 840 - 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 8 — 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 Hays/White Cow Canyon WS water safe to drink? ▼
Hays/White Cow Canyon WS (PWS ID: 083090044) has 158 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 840 people using Groundwater sources.
How many people does Hays/White Cow Canyon WS serve? ▼
Hays/White Cow Canyon WS serves 840 people in Harlem, EPA Region 8 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 150 service connections.
What type of violations does Hays/White Cow Canyon WS have? ▼
Hays/White Cow Canyon WS has 158 total violations: 15 health-based violations (MCL exceedances or treatment failures), 140 monitoring/reporting violations, and 1 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Hays/White Cow Canyon WS water? ▼
No PFAS testing data is available for Hays/White Cow Canyon WS under the EPA's UCMR5 monitoring program.
What water source does Hays/White Cow Canyon WS use? ▼
Hays/White Cow Canyon WS 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.