BIA San Carlos
PWS ID: 090400060 · San Carlos, 09 85550
Population Served
2,150
Total Violations
309
Health-Based Violations
28
Water Source
Groundwater
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- Federal
- Connections
- 75
- School/Daycare
- No
- MCL Violations
- 27
- Monitoring Violations
- 201
- Treatment Tech Violations
- 1
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 29 | 2013 |
| Coliform (TCR) | MCL | 15 | 2015 |
| Arsenic | MCL | 12 | 2012 |
| Arsenic | MR | 10 | 2012 |
| Revised Total Coliform Rule | RPT | 9 | 2025 |
| Nitrate | MR | 6 | 2017 |
| TTHM | MR | 6 | 2021 |
| Consumer Confidence Rule | Other | 6 | 2009 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 5 | 2014 |
| ETHYLENE DIBROMIDE | MR | 5 | 2014 |
| Total Haloacetic Acids (HAA5) | MR | 5 | 2021 |
| Atrazine | MR | 4 | 2014 |
| Total Polychlorinated Biphenyls (PCB) | MR | 4 | 2004 |
| Chlordane | MR | 4 | 2004 |
| Chlorine | MR | 4 | 2023 |
| Barium | MR | 3 | 2004 |
| Cadmium | MR | 3 | 2004 |
| Chromium | MR | 3 | 2004 |
| Mercury | MR | 3 | 2004 |
| Fluoride | MR | 3 | 2004 |
| Selenium | MR | 3 | 2004 |
| BHC-GAMMA | MR | 3 | 2004 |
| Toxaphene | MR | 3 | 2004 |
| Methoxychlor | MR | 3 | 2004 |
| Carbofuran | MR | 3 | 2004 |
| LASSO | MR | 3 | 2004 |
| 2,3,7,8-TCDD | MR | 3 | 2014 |
| Heptachlor | MR | 3 | 2004 |
| Heptachlor epoxide | MR | 3 | 2004 |
| 2,4-D | MR | 3 | 2004 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.