SAN YSIDRO WATER SUPPLY SYSTEM
PWS ID: NM3509723 · SAN YSIDRO, New Mexico 87053
Population Served
166
Total Violations
429
Health-Based Violations
193
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 96
- County
- Sandoval
- School/Daycare
- No
- MCL Violations
- 178
- Monitoring Violations
- 189
- Treatment Tech Violations
- 15
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Fluoride | MCL | 138 | 2024 |
| Arsenic | MR | 44 | 2022 |
| Total Haloacetic Acids (HAA5) | MR | 40 | 2023 |
| TTHM | MR | 39 | 2023 |
| Arsenic | MCL | 24 | 2023 |
| Coliform (TCR) | MR | 23 | 1998 |
| Consumer Confidence Rule | Other | 18 | 2021 |
| Lead and Copper Rule | MR | 18 | 2015 |
| TTHM | MCL | 13 | 2011 |
| Fluoride | MR | 12 | 2022 |
| Revised Total Coliform Rule | MON | 8 | 2020 |
| Groundwater Rule | TT | 8 | 2025 |
| Public Notice | Other | 5 | 2022 |
| Chlorine | MR | 4 | 2020 |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | TT | 4 | 2012 |
| LEAD AND COPPER RULE REVISIONS | RPT | 3 | 2024 |
| LEAD AND COPPER RULE REVISIONS | TT | 3 | 2024 |
| Coliform (TCR) | MCL | 3 | 1999 |
| Nitrate-Nitrite | MR | 1 | 2006 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.