PATTERSON VALLEY WC
PWS ID: CO0145540 · ROCKY FORD, Colorado 81067
PFAS Detected
1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
Population Served
96
Total Violations
521
Health-Based Violations
425
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 42
- County
- Otero
- School/Daycare
- No
- MCL Violations
- 425
- Monitoring Violations
- 77
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Gross Alpha, Excl. Radon and U | MCL | 207 | 2025 |
| Combined Radium (-226 and -228) | MCL | 207 | 2025 |
| Coliform (TCR) | MCL | 11 | 1994 |
| Public Notice | Other | 11 | 2024 |
| Combined Uranium | MR | 9 | 2024 |
| Gross Alpha, Excl. Radon and U | MR | 6 | 2024 |
| Combined Radium (-226 and -228) | MR | 6 | 2024 |
| Lead and Copper Rule | MR | 6 | 2025 |
| Nitrate | MR | 5 | 2024 |
| TTHM | MR | 3 | 2015 |
| Total Haloacetic Acids (HAA5) | MR | 3 | 2015 |
| Arsenic | MR | 3 | 2014 |
| Cadmium | MR | 3 | 2014 |
| Antimony, Total | MR | 3 | 2014 |
| Beryllium, Total | MR | 3 | 2014 |
| Thallium, Total | MR | 3 | 2014 |
| Selenium | MR | 3 | 2014 |
| Toluene | MR | 3 | 2024 |
| Mercury | MR | 3 | 2014 |
| Nickel | MR | 3 | 2014 |
| Chlorine | MR | 3 | 2016 |
| E. COLI | MR | 3 | 2024 |
| Barium | MR | 3 | 2014 |
| Chromium | MR | 3 | 2014 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 2 of 60 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFNA | 9/9/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHxS | 9/9/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpA | 9/9/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBS | 9/9/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxA | 9/9/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDoA | 9/9/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFOA | 9/9/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFTA | 9/9/2024 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| NMeFOSAA | 9/9/2024 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| PFMBA | 9/9/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NEtFOSAA | 9/9/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| lithium | 9/9/2024 | 291.0000 µg/L | 9 µg/L | Detected |
| PFTrDA | 9/9/2024 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| PFDA | 9/9/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 8:2 FTS | 9/9/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFOS | 9/9/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| NFDHA | 9/9/2024 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFEESA | 9/9/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpS | 9/9/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeS | 9/9/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFMPA | 9/9/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 4:2 FTS | 9/9/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 6:2 FTS | 9/9/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFBA | 9/9/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| HFPO-DA | 9/9/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| ADONA | 9/9/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 9Cl-PF3ONS | 9/9/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 11Cl-PF3OUdS | 9/9/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFUnA | 9/9/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFPeA | 9/9/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFUnA | 3/12/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFHxA | 3/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDA | 3/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBA | 3/12/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFOA | 3/12/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFDoA | 3/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 11Cl-PF3OUdS | 3/12/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 9Cl-PF3ONS | 3/12/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| HFPO-DA | 3/12/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFHpA | 3/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 6:2 FTS | 3/12/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 4:2 FTS | 3/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFTA | 3/12/2024 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFTrDA | 3/12/2024 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| NEtFOSAA | 3/12/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| NMeFOSAA | 3/12/2024 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| ADONA | 3/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeA | 3/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpS | 3/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeS | 3/12/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
PFAS data from EPA UCMR5 monitoring program (2023-2025).
This data is provided for informational purposes only.