Non-Transient Non-Community Water System · PWS CO0241186
Colowyo Coal Company
Operator location Denver, Colorado - 36% of 145 violations are health-based (upper-third health share (> 23%)); groundwater source; 500 served per SDWIS.
- 500
- People served (this PWS)
- 145
- EPA violations (this PWS)
- 52
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Colowyo Coal Company standing, high SDWIS violation third
36% of 145 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 36% is upper-third health share (> 23%). Population rank #28,780 of 29,740 among systems serving 500+.
The verdict
Colowyo Coal Company sits in the upper third of the sitemap cohort by violation count (145), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (500; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 36% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #28,780 of 29,740
- Population · /systems
- #548 of 551
- Population · CO
- 145
- Total EPA violations on record
- 36%
- 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
- Non-Transient Non-Community
- Owner Type
- Private
- Connections
- 6
- County
- Moffat
- School/Daycare
- No
- MCL Violations
- 34
- Monitoring Violations
- 88
- Treatment Tech Violations
- 18
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| TTHM | MCL | 25 | 2024 |
| Surface Water Treatment Rule | TT | 18 | 2003 |
| Coliform (TCR) | MR | 10 | 2012 |
| Total Haloacetic Acids (HAA5) | MCL | 9 | 2005 |
| Chlorine | MR | 9 | 2022 |
| Nitrate | MR | 7 | 2007 |
| Surface Water Treatment Rule | MR | 6 | 2002 |
| Arsenic | MR | 4 | 2007 |
| Cadmium | MR | 4 | 2007 |
| Chromium | MR | 4 | 2007 |
| Nickel | MR | 4 | 2007 |
| Selenium | MR | 4 | 2007 |
| Fluoride | MR | 4 | 2007 |
| Barium | MR | 4 | 2007 |
| Mercury | MR | 4 | 2007 |
| Thallium, Total | MR | 4 | 2007 |
| Beryllium, Total | MR | 4 | 2007 |
| Antimony, Total | MR | 4 | 2007 |
| Lead and Copper Rule | MR | 3 | 2011 |
| Revised Total Coliform Rule | MON | 3 | 2022 |
| Total Haloacetic Acids (HAA5) | MR | 3 | 2025 |
| TTHM | MR | 3 | 2025 |
Violation Count vs. the National Corpus
Colowyo Coal Company has 145 recorded EPA violations, 80% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 19% carry more. 36% of this system's own violations are health-based (52 of 145), and it ranks #28,780 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)
145 Higher than most more violations than 80% 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 Colowyo Coal Company
52 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for CO0241186.
Sources: EPA SDWIS · Colorado Department of Public Health and Environment, Water Quality Control
Nationwide peers
145 violations · 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 with smaller service footprints
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Colowyo Coal Company
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.