RIVERHEAD WATER DISTRICT
PWS ID: NY5103705 · RIVERHEAD, New York 11901
PFAS Detected
4 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
Population Served
35,000
Total Violations
156
Health-Based Violations
3
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 9,334
- County
- Suffolk
- School/Daycare
- No
- MCL Violations
- 3
- Monitoring Violations
- 147
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| cis-1,2-Dichloroethylene | MR | 3 | 2010 |
| o-Dichlorobenzene | MR | 3 | 2010 |
| 1,1-Dichloroethylene | MR | 3 | 2010 |
| 1,2-Dichloroethane | MR | 3 | 2010 |
| Carbon tetrachloride | MR | 3 | 2010 |
| Trichloroethylene | MR | 3 | 2010 |
| Tetrachloroethylene | MR | 3 | 2010 |
| CHLOROBENZENE | MR | 3 | 2010 |
| Benzene | MR | 3 | 2010 |
| Toluene | MR | 3 | 2010 |
| Ethylbenzene | MR | 3 | 2010 |
| Styrene | MR | 3 | 2010 |
| BHC-GAMMA | MR | 3 | 2010 |
| Toxaphene | MR | 3 | 2010 |
| Dalapon | MR | 3 | 2010 |
| Di(2-ethylhexyl) adipate | MR | 3 | 2010 |
| Di(2-ethylhexyl) phthalate | MR | 3 | 2010 |
| Picloram | MR | 3 | 2010 |
| Dinoseb | MR | 3 | 2010 |
| Hexachlorocyclopentadiene | MR | 3 | 2010 |
| Aldicarb sulfoxide | MR | 3 | 2010 |
| Aldicarb sulfone | MR | 3 | 2010 |
| Atrazine | MR | 3 | 2010 |
| LASSO | MR | 3 | 2010 |
| Heptachlor | MR | 3 | 2010 |
| Benzo(a)pyrene | MR | 3 | 2010 |
| Total Polychlorinated Biphenyls (PCB) | MR | 3 | 2010 |
| Chlordane | MR | 3 | 2010 |
| Consumer Confidence Rule | Other | 3 | 2010 |
| Nitrate-Nitrite | MR | 3 | 2023 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 4 of 600 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| NMeFOSAA | 7/6/2023 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| NEtFOSAA | 7/6/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFTrDA | 7/6/2023 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| PFTA | 7/6/2023 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFTA | 7/31/2023 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| NMeFOSAA | 7/31/2023 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| NEtFOSAA | 7/31/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFTrDA | 7/31/2023 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| NMeFOSAA | 7/17/2023 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| NEtFOSAA | 7/17/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFTrDA | 7/17/2023 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| PFTA | 7/17/2023 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFNA | 6/20/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHpS | 6/20/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeS | 6/20/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFEESA | 6/20/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NFDHA | 6/20/2023 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| 6:2 FTS | 6/20/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFHxS | 6/20/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFOS | 6/20/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFTrDA | 6/20/2023 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| PFBS | 6/20/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFOA | 6/20/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFMBA | 6/20/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeA | 6/20/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMPA | 6/20/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHpA | 6/20/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFUnA | 6/20/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFBA | 6/20/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| lithium | 6/20/2023 | <9 µg/L | 9 µg/L | Not Detected |
| HFPO-DA | 6/20/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| ADONA | 6/20/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 9Cl-PF3ONS | 6/20/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 8:2 FTS | 6/20/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 11Cl-PF3OUdS | 6/20/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFTA | 6/20/2023 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFHxA | 6/20/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDoA | 6/20/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDA | 6/20/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NMeFOSAA | 6/20/2023 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| NEtFOSAA | 6/20/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 4:2 FTS | 6/20/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 8:2 FTS | 6/20/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFDoA | 6/20/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxA | 6/20/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFUnA | 6/20/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 11Cl-PF3OUdS | 6/20/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 9Cl-PF3ONS | 6/20/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| ADONA | 6/20/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| HFPO-DA | 6/20/2023 | <0.005 µg/L | 0.005 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.