ANTONITO TOWN OF
PWS ID: CO0111100 · ANTONITO, Colorado 81120
Population Served
981
Total Violations
574
Health-Based Violations
55
Water Source
Surface Water
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 435
- County
- Conejos
- School/Daycare
- No
- MCL Violations
- 4
- Monitoring Violations
- 487
- Treatment Tech Violations
- 51
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 40 | 2013 |
| Chlorine | MR | 38 | 2025 |
| Lead and Copper Rule | MR | 30 | 2020 |
| Surface Water Treatment Rule | MR | 28 | 2025 |
| Total Haloacetic Acids (HAA5) | MR | 26 | 2020 |
| TTHM | MR | 26 | 2020 |
| Public Notice | Other | 23 | 2022 |
| Surface Water Treatment Rule | TT | 21 | 2018 |
| Revised Total Coliform Rule | MON | 16 | 2025 |
| CARBON, TOTAL | MR | 14 | 2024 |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | TT | 12 | 2018 |
| Nitrate | MR | 11 | 2012 |
| Groundwater Rule | TT | 9 | 2018 |
| Xylenes, Total | MR | 6 | 2020 |
| DICHLOROMETHANE | MR | 6 | 2020 |
| o-Dichlorobenzene | MR | 6 | 2020 |
| Vinyl chloride | MR | 6 | 2020 |
| 1,1,1-Trichloroethane | MR | 6 | 2020 |
| Carbon tetrachloride | MR | 6 | 2020 |
| 1,2-Dichloropropane | MR | 6 | 2020 |
| Trichloroethylene | MR | 6 | 2020 |
| 1,1,2-Trichloroethane | MR | 6 | 2020 |
| Benzene | MR | 6 | 2020 |
| Interim Enhanced Surface Water Treatment Rule | MR | 6 | 2022 |
| p-Dichlorobenzene | MR | 6 | 2020 |
| 1,1-Dichloroethylene | MR | 6 | 2020 |
| trans-1,2-Dichloroethylene | MR | 6 | 2020 |
| 1,2-Dichloroethane | MR | 6 | 2020 |
| CHLOROBENZENE | MR | 6 | 2020 |
| Ethylbenzene | MR | 6 | 2020 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 120 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFEESA | 9/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFUnA | 9/12/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 11Cl-PF3OUdS | 9/12/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 9Cl-PF3ONS | 9/12/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| ADONA | 9/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| HFPO-DA | 9/12/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFTrDA | 9/12/2024 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| PFPeS | 9/12/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFMBA | 9/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NFDHA | 9/12/2024 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFHxA | 9/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeA | 9/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpS | 9/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBA | 9/12/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFDoA | 9/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDA | 9/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFOA | 9/12/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOS | 9/12/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFNA | 9/12/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHxS | 9/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBS | 9/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMPA | 9/12/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 8:2 FTS | 9/12/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 4:2 FTS | 9/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 6:2 FTS | 9/12/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFTA | 9/12/2024 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFHpA | 9/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NEtFOSAA | 9/12/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| NMeFOSAA | 9/12/2024 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| lithium | 8/7/2024 | <9 µg/L | 9 µg/L | Not Detected |
| 4:2 FTS | 5/7/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 6:2 FTS | 5/7/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFBA | 5/7/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| HFPO-DA | 5/7/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| ADONA | 5/7/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 9Cl-PF3ONS | 5/7/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 8:2 FTS | 5/7/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFUnA | 5/7/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFDA | 5/7/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxA | 5/7/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDoA | 5/7/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFNA | 5/7/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| NMeFOSAA | 5/7/2024 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| PFTrDA | 5/7/2024 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| PFTA | 5/7/2024 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| 11Cl-PF3OUdS | 5/7/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFOA | 5/7/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| NEtFOSAA | 5/7/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFMPA | 5/7/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOS | 5/7/2024 | <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.