SAN YSIDRO WATER SUPPLY SYSTEM
PWS ID: NM3509723 · SAN YSIDRO, New Mexico 87053
SAN YSIDRO WATER SUPPLY SYSTEM serves 166 people in SAN YSIDRO, New Mexico using Groundwater water sources. It has 429 recorded EPA violations, including 193 health-based violations. No PFAS contamination was detected in UCMR5 testing.
Water Quality Snapshot: SAN YSIDRO WATER SUPPLY SYSTEM
SAN YSIDRO WATER SUPPLY SYSTEM is a local-owned community water system that delivers drinking water to 166 residents in SAN YSIDRO, New Mexico (Sandoval County) through 96 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 429 total violations for this system , of which 193 (45%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 189 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.
The most frequently cited contaminant at this system is Fluoride, recorded in 138 violations (MCL, health-based). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.
Across New Mexico, EPA tracks 1,037 public water systems serving 2,027,497 people, with 154,522 cumulative violations and 38,650 health-based violations on record. About 97% of systems in the state carry at least one violation, and state-wide the average per system is 149 violations. SAN YSIDRO WATER SUPPLY SYSTEM's 429 violations sit above the New Mexico average. Statewide, 70 of 72 UCMR5-tested systems have reported PFAS detections (97.2%). All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.
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 |
Verify This Water System
The figures above are aggregated from EPA's public databases. To verify the underlying records — or to file a complaint, request a Consumer Confidence Report, or check current monitoring status — go directly to the federal and state regulators that enforce the Safe Drinking Water Act for SAN YSIDRO WATER SUPPLY SYSTEM.
EPA SDWIS — Federal Reports
EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:
View PWS ID NM3509723 on SDWISSource: EPA SDWIS Federal Reports Search
New Mexico Drinking Water Authority
New Mexico's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.
Find NM regulator via EPA SDWISViolation Timeline
Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.
| Year (latest) | Contaminant | Category | Count | EPA Record |
|---|---|---|---|---|
| 2025 | Groundwater Rule | TT | 8 | SDWIS / NM3509723 / 0700 |
| 2024 | Fluoride | MCL | 138 | SDWIS / NM3509723 / 1025 |
| 2024 | LEAD AND COPPER RULE REVISIONS | RPT | 3 | SDWIS / NM3509723 / 5200 |
| 2024 | LEAD AND COPPER RULE REVISIONS | TT | 3 | SDWIS / NM3509723 / 5200 |
| 2023 | Total Haloacetic Acids (HAA5) | MR | 40 | SDWIS / NM3509723 / 2456 |
| 2023 | TTHM | MR | 39 | SDWIS / NM3509723 / 2950 |
| 2023 | Arsenic | MCL | 24 | SDWIS / NM3509723 / 1005 |
| 2022 | Arsenic | MR | 44 | SDWIS / NM3509723 / 1005 |
| 2022 | Fluoride | MR | 12 | SDWIS / NM3509723 / 1025 |
| 2022 | Public Notice | Other | 5 | SDWIS / NM3509723 / 7500 |
| 2021 | Consumer Confidence Rule | Other | 18 | SDWIS / NM3509723 / 7000 |
| 2020 | Revised Total Coliform Rule | MON | 8 | SDWIS / NM3509723 / 8000 |
| 2020 | Chlorine | MR | 4 | SDWIS / NM3509723 / 0999 |
| 2015 | Lead and Copper Rule | MR | 18 | SDWIS / NM3509723 / 5000 |
| 2012 | Stage 1 Disinfectants and Disinfection Byproducts Rule | TT | 4 | SDWIS / NM3509723 / 0400 |
How SAN YSIDRO WATER SUPPLY SYSTEM Compares
Cross-reference this system's record against state averages and the federal MCL framework for context.
| Metric | SAN YSIDRO WATER SUPPLY SYSTEM | New Mexico avg | Federal benchmark |
|---|---|---|---|
| Total violations | 429 | 149 | SDWA compliance — any non-zero count is a recorded breach |
| Health-based violations | 193 | 37.3 | Indicates a contaminant exceeded a federal MCL |
| PFAS detection | None | 97.2% | EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt |
| Population served | 166 | 1,955 | Sizing context for compliance burden |
Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,037 regulated public water systems in New Mexico.
Federal MCL reference — Safe Drinking Water Act thresholds ▼
| Contaminant | Federal MCL / Action Level | Note |
|---|---|---|
| Lead | 0 mg/L (Action Level: 0.015 mg/L) | Lead and Copper Rule treatment technique |
| Arsenic | 0.010 mg/L (10 ppb) | Health-based MCL since 2006 |
| Total Coliform | Treatment technique (RTCR) | Indicator organism, monitoring trigger |
| PFOA / PFOS (PFAS) | 4.0 ppt each (final 2024 rule) | Compliance deadline 2029 |
| Nitrate (as N) | 10 mg/L | Acute health risk for infants |
Frequently Asked Questions
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Related Data for New Mexico
Read our methodology — how this data is sourced, computed, and verified.