TOWN OF MOUNT AIRY
PWS ID: MD0060007 · MOUNT AIRY, Maryland 21771
PFAS Detected
7 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
Population Served
9,890
Total Violations
156
Health-Based Violations
5
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 3,326
- County
- Carroll
- School/Daycare
- No
- MCL Violations
- 5
- Monitoring Violations
- 151
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Fluoride | MR | 10 | 2022 |
| 1,2,4-Trichlorobenzene | MR | 5 | 2001 |
| 1,2-Dichloroethane | MR | 5 | 2001 |
| 1,1,1-Trichloroethane | MR | 5 | 2001 |
| 1,2-Dichloropropane | MR | 5 | 2001 |
| 1,1,2-Trichloroethane | MR | 5 | 2001 |
| CHLOROBENZENE | MR | 5 | 2001 |
| Benzene | MR | 5 | 2001 |
| Ethylbenzene | MR | 5 | 2001 |
| Styrene | MR | 5 | 2001 |
| Xylenes, Total | MR | 5 | 2001 |
| DICHLOROMETHANE | MR | 5 | 2001 |
| p-Dichlorobenzene | MR | 5 | 2001 |
| Vinyl chloride | MR | 5 | 2001 |
| Trichloroethylene | MR | 5 | 2001 |
| 1,1-Dichloroethylene | MR | 5 | 2001 |
| trans-1,2-Dichloroethylene | MR | 5 | 2001 |
| Nitrate | MCL | 5 | 1992 |
| cis-1,2-Dichloroethylene | MR | 5 | 2001 |
| Tetrachloroethylene | MR | 5 | 2001 |
| Toluene | MR | 5 | 2001 |
| o-Dichlorobenzene | MR | 5 | 2001 |
| Carbon tetrachloride | MR | 5 | 2001 |
| Chromium | MR | 3 | 1999 |
| Nickel | MR | 3 | 1999 |
| Antimony, Total | MR | 3 | 1999 |
| Thallium, Total | MR | 3 | 1999 |
| TTHM | MR | 3 | 2010 |
| Mercury | MR | 3 | 1999 |
| Cadmium | MR | 3 | 1999 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 33 of 300 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFHxA | 6/6/2023 | 0.0041 µg/L | 0.003 µg/L | Detected |
| PFHpA | 6/6/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxS | 6/6/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFNA | 6/6/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOS | 6/6/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOA | 6/6/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFDoA | 6/6/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBS | 6/6/2023 | 0.0063 µg/L | 0.003 µg/L | Detected |
| PFUnA | 6/6/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 11Cl-PF3OUdS | 6/6/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 9Cl-PF3ONS | 6/6/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| ADONA | 6/6/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| HFPO-DA | 6/6/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFDA | 6/6/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBA | 6/6/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFHpS | 6/6/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeS | 6/6/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| NFDHA | 6/6/2023 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFEESA | 6/6/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMBA | 6/6/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeA | 6/6/2023 | 0.0046 µg/L | 0.003 µg/L | Detected |
| PFMPA | 6/6/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 8:2 FTS | 6/6/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 4:2 FTS | 6/6/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 6:2 FTS | 6/6/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 11Cl-PF3OUdS | 6/6/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFHpS | 6/6/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NFDHA | 6/6/2023 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFHpA | 6/6/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFNA | 6/6/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOS | 6/6/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOA | 6/6/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFDA | 6/6/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDoA | 6/6/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeS | 6/6/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFUnA | 6/6/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFBS | 6/6/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 9Cl-PF3ONS | 6/6/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| ADONA | 6/6/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| HFPO-DA | 6/6/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFBA | 6/6/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 6:2 FTS | 6/6/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 4:2 FTS | 6/6/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 8:2 FTS | 6/6/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFMPA | 6/6/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFPeA | 6/6/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMBA | 6/6/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFEESA | 6/6/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxA | 6/6/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxS | 6/6/2023 | <0.003 µg/L | 0.003 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.