NEW CASTLE/STANWOOD W.D.
PWS ID: NY5903442 · CHAPPAQUA, New York 10514
Population Served
17,116
Total Violations
105
Health-Based Violations
4
Water Source
Surface Water
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 5,183
- County
- Westchester
- School/Daycare
- No
- MCL Violations
- 4
- Monitoring Violations
- 95
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| TTHM | MR | 8 | 2018 |
| Total Haloacetic Acids (HAA5) | MR | 8 | 2018 |
| Beryllium, Total | MR | 5 | 2002 |
| Selenium | MR | 5 | 2002 |
| Thallium, Total | MR | 5 | 2002 |
| Cadmium | MR | 5 | 2002 |
| Nitrate-Nitrite | MR | 5 | 2002 |
| Barium | MR | 5 | 2002 |
| Chromium | MR | 5 | 2002 |
| Fluoride | MR | 5 | 2002 |
| Nickel | MR | 5 | 2002 |
| Nitrite | MR | 5 | 2002 |
| Mercury | MR | 5 | 2002 |
| CYANIDE | MR | 5 | 2002 |
| Antimony, Total | MR | 5 | 2002 |
| Nitrate | MR | 5 | 2002 |
| Arsenic | MR | 5 | 2002 |
| Coliform (TCR) | MR | 4 | 2007 |
| Coliform (TCR) | MCL | 4 | 2009 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 120 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| 9Cl-PF3ONS | 9/12/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 11Cl-PF3OUdS | 9/12/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| lithium | 9/12/2023 | <9 µg/L | 9 µg/L | Not Detected |
| PFBS | 9/12/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpA | 9/12/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFUnA | 9/12/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFNA | 9/12/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOS | 9/12/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOA | 9/12/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFDA | 9/12/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDoA | 9/12/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxA | 9/12/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxS | 9/12/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 8:2 FTS | 9/12/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFBA | 9/12/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFHpS | 9/12/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeS | 9/12/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| NFDHA | 9/12/2023 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFEESA | 9/12/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMBA | 9/12/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| HFPO-DA | 9/12/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFMPA | 9/12/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| ADONA | 9/12/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 4:2 FTS | 9/12/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 6:2 FTS | 9/12/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFTA | 9/12/2023 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFTrDA | 9/12/2023 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| NEtFOSAA | 9/12/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| NMeFOSAA | 9/12/2023 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| PFPeA | 9/12/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBA | 6/20/2023 | <0.005 µg/L | 0.005 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 |
| PFUnA | 6/20/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 6:2 FTS | 6/20/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFPeS | 6/20/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFDA | 6/20/2023 | <0.003 µg/L | 0.003 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 |
| PFMPA | 6/20/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFPeA | 6/20/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMBA | 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 |
| PFHxA | 6/20/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpS | 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 |
| PFEESA | 6/20/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFTrDA | 6/20/2023 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| 11Cl-PF3OUdS | 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.