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States → New Mexico

Community Water System · PWS NM3518225

North San Ysidro Mdwca

Ilfeld, New Mexico 87538 - drinking water served from groundwater sources to 133 people, tracked in EPA SDWIS and UCMR5.

133
People served
226
EPA violations
52
Health-based
Untested
UCMR5 result

The verdict

EPA records 226 drinking-water violations at North San Ysidro Mdwca, 23% of them health-based - above the New Mexico per-system average.

226
Total EPA violations on record
23%
Health-based (MCL / treatment failure)
133
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: North San Ysidro Mdwca

North San Ysidro Mdwca is a local-owned community water system that delivers drinking water to 133 residents in Ilfeld, New Mexico (San Miguel County) through 45 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 226 total violations for this system , of which 52 (23%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 71 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 Consumer Confidence Rule, recorded in 50 violations (Other). 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. Statewide, 70 of 72 UCMR5-tested systems have reported PFAS detections (97.2%).

North San Ysidro Mdwca's 226 violations sit above the New Mexico average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
133
Total Violations
226
Health-Based Violations
52
Water Source
Groundwater

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

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 North San Ysidro Mdwca.

Federal Source of Truth

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 NM3518225 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

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 SDWIS

Violation 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 Consumer Confidence Rule Other 50 SDWIS / NM3518225 / 7000
2022 E. COLI MR 9 SDWIS / NM3518225 / 3014
2021 Lead and Copper Rule MR 13 SDWIS / NM3518225 / 5000
2020 Groundwater Rule TT 32 SDWIS / NM3518225 / 0700
2020 Public Notice Other 14 SDWIS / NM3518225 / 7500
2020 Groundwater Rule Other 5 SDWIS / NM3518225 / 0700
2017 Revised Total Coliform Rule MON 3 SDWIS / NM3518225 / 8000
2016 Revised Total Coliform Rule TT 6 SDWIS / NM3518225 / 8000
2016 Revised Total Coliform Rule MCL 6 SDWIS / NM3518225 / 8000
2012 Coliform (TCR) MR 45 SDWIS / NM3518225 / 3100
2007 Coliform (TCR) MCL 4 SDWIS / NM3518225 / 3100
1986 Nitrate MCL 4 SDWIS / NM3518225 / 1040
1984 Fluoride MR 1 SDWIS / NM3518225 / 1025

How North San Ysidro Mdwca Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric North San Ysidro Mdwca New Mexico avg Federal benchmark
Total violations 226 149 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 52 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 133 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 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is North San Ysidro Mdwca water safe to drink? ▼
North San Ysidro Mdwca (PWS ID: NM3518225) has 226 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 133 people using Groundwater sources.
How many people does North San Ysidro Mdwca serve? ▼
North San Ysidro Mdwca serves 133 people in Ilfeld, New Mexico. It is a Local-owned system using Groundwater water sources with 45 service connections.
What type of violations does North San Ysidro Mdwca have? ▼
North San Ysidro Mdwca has 226 total violations: 52 health-based violations (MCL exceedances or treatment failures), 71 monitoring/reporting violations, and 38 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in North San Ysidro Mdwca water? ▼
No PFAS testing data is available for North San Ysidro Mdwca under the EPA's UCMR5 monitoring program.
What water source does North San Ysidro Mdwca use? ▼
North San Ysidro Mdwca uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.