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Community Water System · PWS CO0150800

May Valley WA

Wiley, Colorado 81092 - drinking water served from groundwater sources to 1,500 people, tracked in EPA SDWIS and UCMR5.

1,500
People served
2,247
EPA violations
1,709
Health-based
Untested
UCMR5 result

The verdict

EPA records 2,247 drinking-water violations at May Valley WA, 76% of them health-based - above the Colorado per-system average.

2,247
Total EPA violations on record
76%
Health-based (MCL / treatment failure)
1,500
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: May Valley WA

May Valley WA is a private-owned community water system that delivers drinking water to 1,500 residents in Wiley, Colorado (Prowers County) through 629 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 2,247 total violations for this system , of which 1,709 (76%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 522 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 Combined Radium (-226 and -228), recorded in 1,022 violations (MCL, health-based). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Colorado, EPA tracks 2,193 public water systems serving 7,473,456 people, with 238,796 cumulative violations and 30,589 health-based violations on record. About 93% of systems in the state carry at least one violation, and state-wide the average per system is 108.9 violations. Statewide, 98 of 163 UCMR5-tested systems have reported PFAS detections (60.1%).

May Valley WA's 2,247 violations sit above the Colorado average.

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
1,500
Total Violations
2,247
Health-Based Violations
1,709
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
629
County
Prowers
School/Daycare
No
MCL Violations
1,709
Monitoring Violations
522
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Combined Radium (-226 and -228) MCL 1,022 2025
Gross Alpha, Excl. Radon and U MCL 687 2025
Gross Alpha, Excl. Radon and U MR 24 2024
Combined Radium (-226 and -228) MR 24 2024
Combined Uranium MR 24 2024
1,2,4-Trichlorobenzene MR 17 2020
cis-1,2-Dichloroethylene MR 17 2020
p-Dichlorobenzene MR 17 2020
Vinyl chloride MR 17 2020
trans-1,2-Dichloroethylene MR 17 2020
1,2-Dichloroethane MR 17 2020
1,1,1-Trichloroethane MR 17 2020
Carbon tetrachloride MR 17 2020
Trichloroethylene MR 17 2020
Tetrachloroethylene MR 17 2020
Benzene MR 17 2020
Ethylbenzene MR 17 2020
Styrene MR 17 2020
Xylenes, Total MR 17 2020
o-Dichlorobenzene MR 17 2020
1,1-Dichloroethylene MR 17 2020
1,1,2-Trichloroethane MR 17 2020
CHLOROBENZENE MR 17 2020
DICHLOROMETHANE MR 17 2020
1,2-Dichloropropane MR 17 2020
Toluene MR 17 2020
Public Notice Other 10 2023
Coliform (TCR) MR 4 1993
Fluoride MR 4 2020
E. COLI MR 3 2023

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 May Valley WA.

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 CO0150800 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Colorado Drinking Water Authority

Colorado Department of Public Health and Environment, Water Quality Control is the primacy agency that licenses and inspects May Valley WA under EPA-delegated authority.

Open CO regulator portal

Source: Colorado Department of Public Health and Environment, Water Quality Control

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 Combined Radium (-226 and -228) MCL 1,022 SDWIS / CO0150800 / 4010
2025 Gross Alpha, Excl. Radon and U MCL 687 SDWIS / CO0150800 / 4000
2024 Gross Alpha, Excl. Radon and U MR 24 SDWIS / CO0150800 / 4000
2024 Combined Radium (-226 and -228) MR 24 SDWIS / CO0150800 / 4010
2024 Combined Uranium MR 24 SDWIS / CO0150800 / 4006
2023 Public Notice Other 10 SDWIS / CO0150800 / 7500
2023 E. COLI MR 3 SDWIS / CO0150800 / 3014
2020 1,2,4-Trichlorobenzene MR 17 SDWIS / CO0150800 / 2378
2020 cis-1,2-Dichloroethylene MR 17 SDWIS / CO0150800 / 2380
2020 p-Dichlorobenzene MR 17 SDWIS / CO0150800 / 2969
2020 Vinyl chloride MR 17 SDWIS / CO0150800 / 2976
2020 trans-1,2-Dichloroethylene MR 17 SDWIS / CO0150800 / 2979
2020 1,2-Dichloroethane MR 17 SDWIS / CO0150800 / 2980
2020 1,1,1-Trichloroethane MR 17 SDWIS / CO0150800 / 2981
2020 Carbon tetrachloride MR 17 SDWIS / CO0150800 / 2982

How May Valley WA Compares

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

Metric May Valley WA Colorado avg Federal benchmark
Total violations 2,247 108.9 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 1,709 13.9 Indicates a contaminant exceeded a federal MCL
PFAS detection None 60.1% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 1,500 3,408 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 2,193 regulated public water systems in Colorado.

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 May Valley WA water safe to drink? ▼
May Valley WA (PWS ID: CO0150800) has 2247 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,500 people using Groundwater sources.
How many people does May Valley WA serve? ▼
May Valley WA serves 1,500 people in Wiley, Colorado. It is a Private-owned system using Groundwater water sources with 629 service connections.
What type of violations does May Valley WA have? ▼
May Valley WA has 2,247 total violations: 1,709 health-based violations (MCL exceedances or treatment failures), 522 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in May Valley WA water? ▼
No PFAS testing data is available for May Valley WA under the EPA's UCMR5 monitoring program.
What water source does May Valley WA use? ▼
May Valley WA 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.