AYER DPW WATER DIVISION
PWS ID: MA2019000 · AYER, Massachusetts 01432
PFAS Detected
3 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
Population Served
8,479
Total Violations
55
Health-Based Violations
4
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 3,340
- County
- Middlesex
- School/Daycare
- No
- MCL Violations
- 4
- Monitoring Violations
- 37
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Lead and Copper Rule | MR | 11 | 2023 |
| Arsenic | MR | 7 | 2010 |
| Coliform (TCR) | MCL | 4 | 2000 |
| Consumer Confidence Rule | Other | 4 | 2019 |
| Asbestos | MR | 2 | 1995 |
| Nitrate | MR | 2 | 1996 |
| Total Haloacetic Acids (HAA5) | MR | 2 | 2005 |
| TTHM | MR | 2 | 2005 |
| Barium | MR | 1 | 1998 |
| Cadmium | MR | 1 | 1998 |
| Chromium | MR | 1 | 1998 |
| Nickel | MR | 1 | 1998 |
| Selenium | MR | 1 | 1998 |
| CYANIDE | MR | 1 | 1998 |
| Antimony, Total | MR | 1 | 1998 |
| Fluoride | MR | 1 | 1998 |
| Beryllium, Total | MR | 1 | 1998 |
| Mercury | MR | 1 | 1998 |
| Thallium, Total | MR | 1 | 1998 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 6 of 120 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFMBA | 5/2/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDA | 5/2/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFOA | 5/2/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOS | 5/2/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFNA | 5/2/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHxS | 5/2/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpA | 5/2/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBS | 5/2/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDoA | 5/2/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NFDHA | 5/2/2023 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFPeS | 5/2/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFPeA | 5/2/2023 | 0.0042 µg/L | 0.003 µg/L | Detected |
| PFMPA | 5/2/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 8:2 FTS | 5/2/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 4:2 FTS | 5/2/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 6:2 FTS | 5/2/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFBA | 5/2/2023 | 0.0101 µg/L | 0.005 µg/L | Detected |
| PFHpS | 5/2/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NEtFOSAA | 5/2/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| lithium | 5/2/2023 | <9 µg/L | 9 µg/L | Not Detected |
| PFHxA | 5/2/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFEESA | 5/2/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NMeFOSAA | 5/2/2023 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| PFTrDA | 5/2/2023 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| PFTA | 5/2/2023 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| HFPO-DA | 5/2/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| ADONA | 5/2/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 9Cl-PF3ONS | 5/2/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 11Cl-PF3OUdS | 5/2/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFUnA | 5/2/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 8:2 FTS | 5/2/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFBA | 5/2/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 4:2 FTS | 5/2/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFTA | 5/2/2023 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFTrDA | 5/2/2023 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| NEtFOSAA | 5/2/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFHpS | 5/2/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| lithium | 5/2/2023 | <9 µg/L | 9 µg/L | Not Detected |
| PFBS | 5/2/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMPA | 5/2/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFPeA | 5/2/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMBA | 5/2/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NFDHA | 5/2/2023 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFPeS | 5/2/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHpA | 5/2/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NMeFOSAA | 5/2/2023 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| PFUnA | 5/2/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFHxS | 5/2/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFNA | 5/2/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOS | 5/2/2023 | <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.