Community Water System · PWS 090400051
Colorado River Regional Water System
Operator location Parker, EPA Region 9 — Tribal Water Systems - larger served population (> 3,309) at 8,490 people served; 132 SDWIS violations on record from groundwater sources.
- 8,490
- People served (this PWS)
- 132
- EPA violations (this PWS)
- 17
- Health-based (this PWS)
- No PFAS
- UCMR5 (this PWS)
Colorado River Regional Water System standing, high SDWIS violation third
8,490 people served (SDWIS) - larger served population (> 3,309). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 13% is middle-third health share (≤ 23%). UCMR5: UCMR5 tested, none detected. Population rank #5,371 of 29,740 among systems serving 500+.
The verdict
Colorado River Regional Water System sits in the upper third of the sitemap cohort by violation count (132), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (8,490; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 13% (middle-third health share (≤ 23%)). UCMR5 tested this system and reported no PFAS above the minimum reporting level.
- #5,371 of 29,740
- Population · /systems
- #20 of 129
- Population · 09
- 132
- Total EPA violations on record
- 13%
- 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
- Native American
- Connections
- 1,860
- School/Daycare
- No
- MCL Violations
- 10
- Monitoring Violations
- 28
- Treatment Tech Violations
- 7
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 9 | 2014 |
| Coliform (TCR) | MCL | 7 | 2015 |
| Total Haloacetic Acids (HAA5) | MR | 6 | 2021 |
| TTHM | MR | 6 | 2021 |
| Groundwater Rule | TT | 6 | 2014 |
| Consumer Confidence Rule | Other | 6 | 2006 |
| Nitrate | MR | 3 | 2021 |
| Lead and Copper Rule | MR | 3 | 2023 |
| Public Notice | Other | 3 | 2015 |
| Revised Total Coliform Rule | RPT | 3 | 2025 |
| TTHM | MCL | 2 | 2011 |
| Revised Total Coliform Rule | MCL | 1 | 2016 |
| Revised Total Coliform Rule | TT | 1 | 2020 |
| Revised Total Coliform Rule | MON | 1 | 2016 |
Violation Count vs. the National Corpus
Colorado River Regional Water System has 132 recorded EPA violations, 79% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 21% carry more. 13% of this system's own violations are health-based (17 of 132), and it ranks #5,371 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)
132 Higher than most more violations than 79% 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
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 58 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFHpA | 7/22/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 7/22/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 7/22/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 7/22/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 7/22/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 7/22/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxS | 7/22/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 7/22/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 7/22/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 7/22/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| NEtFOSAA | 7/22/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFUnA | 7/22/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 7/22/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 7/22/2024 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFEESA | 7/22/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 7/22/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 7/22/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 7/22/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFMBA | 7/22/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 7/22/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 7/22/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 7/22/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 7/22/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 7/22/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| HFPO-DA | 7/22/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| ADONA | 7/22/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 7/22/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| 4:2 FTS | 7/22/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 7/22/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFBA | 1/8/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 1/8/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFUnA | 1/8/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFHxA | 1/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 1/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 1/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 1/8/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFOS | 1/8/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFTrDA | 1/8/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFNA | 1/8/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFBS | 1/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 1/8/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFOA | 1/8/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| NMeFOSAA | 1/8/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 1/8/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHpA | 1/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 1/8/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxS | 1/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 1/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 1/8/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| NFDHA | 1/8/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
Population served record for Colorado River Regional Water System
EPA SDWIS lists 8,490 people served and 1,860 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
132 violations · 8,490 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 similar served population
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Colorado River Regional Water System
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in EPA Region 9 — Tribal Water Systems compares on the same EPA violation measures. EPA Region 9 — Tribal Water Systems 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.