Community Water System · PWS CO0150800
May Valley WA
Operator location Wiley, Colorado - 76% of 2,247 violations are health-based (upper-third health share (> 23%)); groundwater source; 1,500 served per SDWIS.
- 1,500
- People served (this PWS)
- 2,247
- EPA violations (this PWS)
- 1,709
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
May Valley WA standing, high SDWIS violation third
76% of 2,247 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 76% is upper-third health share (> 23%). Population rank #15,881 of 29,740 among systems serving 500+.
The verdict
May Valley WA sits in the upper third of the sitemap cohort by violation count (2,247), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 1,500 (mid served population (≤ 3,309)). Health-based share is 76% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #15,881 of 29,740
- Population · /systems
- #289 of 551
- Population · CO
- 2,247
- Total EPA violations on record
- 76%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
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 |
Violation Count vs. the National Corpus
May Valley WA has 2,247 recorded EPA violations, 100% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 0% carry more. 76% of this system's own violations are health-based (1,709 of 2,247), and it ranks #15,881 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
2,247 Higher than most more violations than 99%+ 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
Health-based violations on May Valley WA
1,709 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for CO0150800.
Sources: EPA SDWIS · Colorado Department of Public Health and Environment, Water Quality Control
Nationwide peers
2,247 violations · 1,500 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.
Cross-state systems near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with May Valley WA
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Colorado compares on the same EPA violation measures. Colorado systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.