SAN SEBASTIAN
PWS ID: PR0003303 · SAN SEBASTIAN, Puerto Rico 00685
Population Served
24,449
Total Violations
250
Health-Based Violations
128
Water Source
Surface Water
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 9,157
- County
- San Sebastian Municipio
- School/Daycare
- No
- MCL Violations
- 64
- Monitoring Violations
- 100
- Treatment Tech Violations
- 64
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Total Haloacetic Acids (HAA5) | MCL | 39 | 2020 |
| Surface Water Treatment Rule | TT | 38 | 2001 |
| Interim Enhanced Surface Water Treatment Rule | TT | 17 | 2011 |
| Cryptosporidium | MR | 17 | 2018 |
| TTHM | MCL | 17 | 2016 |
| Turbidity | MR | 15 | 2018 |
| E. COLI | MR | 15 | 2018 |
| Coliform (TCR) | MR | 9 | 2013 |
| CARBON, TOTAL | TT | 9 | 2015 |
| Coliform (TCR) | MCL | 8 | 2016 |
| Lead and Copper Rule | MR | 7 | 2016 |
| Consumer Confidence Rule | Other | 4 | 2020 |
| OXAMYL | MR | 2 | 2015 |
| Chromium | MR | 2 | 1984 |
| Mercury | MR | 2 | 1984 |
| Nitrate | MR | 2 | 1984 |
| Arsenic | MR | 2 | 1984 |
| Selenium | MR | 2 | 1984 |
| Cadmium | MR | 2 | 1984 |
| Fluoride | MR | 2 | 1984 |
| Nitrite | MR | 2 | 2005 |
| Barium | MR | 2 | 1984 |
| Carbofuran | MR | 2 | 2015 |
| TTHM | MR | 1 | 2005 |
| ETHYLENE DIBROMIDE | MR | 1 | 2005 |
| Chlordane | MR | 1 | 2009 |
| Endrin | MR | 1 | 2009 |
| BHC-GAMMA | MR | 1 | 2009 |
| Heptachlor epoxide | MR | 1 | 2009 |
| HEXACHLOROBENZENE | MR | 1 | 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 |
|---|---|---|---|---|
| PFMBA | 9/26/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 8:2 FTS | 9/26/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFDoA | 9/26/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDA | 9/26/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpS | 9/26/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeS | 9/26/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFEESA | 9/26/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeA | 9/26/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMPA | 9/26/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHxS | 9/26/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFUnA | 9/26/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFHpA | 9/26/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxA | 9/26/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBS | 9/26/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 6:2 FTS | 9/26/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFOA | 9/26/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOS | 9/26/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| NFDHA | 9/26/2023 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFNA | 9/26/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 4:2 FTS | 9/26/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| ADONA | 9/26/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBA | 9/26/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 11Cl-PF3OUdS | 9/26/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 9Cl-PF3ONS | 9/26/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| HFPO-DA | 9/26/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFTrDA | 9/26/2023 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| NEtFOSAA | 9/26/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| lithium | 9/26/2023 | <9 µg/L | 9 µg/L | Not Detected |
| PFTA | 9/26/2023 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| NMeFOSAA | 9/26/2023 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| PFBS | 6/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpS | 6/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| HFPO-DA | 6/27/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 11Cl-PF3OUdS | 6/27/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| NFDHA | 6/27/2023 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFEESA | 6/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMBA | 6/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeA | 6/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMPA | 6/27/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 8:2 FTS | 6/27/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 4:2 FTS | 6/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 6:2 FTS | 6/27/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 9Cl-PF3ONS | 6/27/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| ADONA | 6/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpA | 6/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFUnA | 6/27/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFHxA | 6/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDoA | 6/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDA | 6/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFOA | 6/27/2023 | <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.