Community Water System · PWS NM3518225
North San Ysidro Mdwca
Operator location Ilfeld, New Mexico - 23% of 226 violations are health-based (upper-third health share (> 23%)); groundwater source; 133 served per SDWIS.
- 133
- People served (this PWS)
- 226
- EPA violations (this PWS)
- 52
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
North San Ysidro Mdwca standing, high SDWIS violation third
23% of 226 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 23% is upper-third health share (> 23%).
The verdict
North San Ysidro Mdwca sits in the upper third of the sitemap cohort by violation count (226), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (133; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 23% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- 226
- Total EPA violations on record
- 23%
- Health-based (MCL / treatment failure)
- 133
- People served by this PWS (SDWIS)
- N/A
- PFAS compounds detected (UCMR5)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 45
- County
- San Miguel
- School/Daycare
- No
- MCL Violations
- 14
- Monitoring Violations
- 71
- Treatment Tech Violations
- 38
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Consumer Confidence Rule | Other | 50 | 2025 |
| Coliform (TCR) | MR | 45 | 2012 |
| Groundwater Rule | TT | 32 | 2020 |
| Public Notice | Other | 14 | 2020 |
| Lead and Copper Rule | MR | 13 | 2021 |
| E. COLI | MR | 9 | 2022 |
| Revised Total Coliform Rule | TT | 6 | 2016 |
| Revised Total Coliform Rule | MCL | 6 | 2016 |
| Groundwater Rule | Other | 5 | 2020 |
| Coliform (TCR) | MCL | 4 | 2007 |
| Nitrate | MCL | 4 | 1986 |
| Revised Total Coliform Rule | MON | 3 | 2017 |
| Fluoride | MR | 1 | 1984 |
Violation Count vs. the National Corpus
North San Ysidro Mdwca has 226 recorded EPA violations, 87% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 13% carry more. 23% of this system's own violations are health-based (52 of 226), and it ranks unranked by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
226 Higher than most more violations than 87% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
Health-based violations on North San Ysidro Mdwca
52 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for NM3518225.
Sources: EPA SDWIS
Nationwide peers
226 violations · 133 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
What to do with North San Ysidro Mdwca
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in New Mexico compares on the same EPA violation measures. New Mexico systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.