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San Antonito, NM Tap Water Quality 2026

Water quality report for San Antonito, NM — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at San Antonito's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Entranosa Water Association PWSID: NM3524626 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 1.30 ppb, 9% of the action level and no violations are open. No PFAS was detected.

B

San Antonito earns a B for water quality

Graded on violations, lead, and PFAS, with state inspection findings.

Lead: 1.30 ppb — 9% of the federal action level
PFAS tested, none detected
5 violations since 2015, 0 health-based
No violations currently open
San Antonito's lead level vs. all New Mexico community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 1.30 ppb — 9% of the federal action level
✓ Lower lead than 67% of New Mexico utilities
Population Served
92
~3225 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
5 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
9% of EPA action level
1.30 ppb
Action level: 15 ppb
Copper (Cu)
90th percentile of tap samples. SDWIS reports a copper figure only when a system exceeds the action level, so any value here is an exceedance.
107.7% of EPA action level
1,400 ppb
Action level: 1,300 ppb
The 90th-percentile lead result is 1.30 ppb, 9% of the 15 ppb federal action level. The action level is a treatment trigger, not a legal maximum, and it is measured across sampled taps rather than at any single home. Copper reached the action level here; a copper figure appears in SDWIS only when a system triggers it.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Public Notice OTHER — — 2020 Resolved
Groundwater Rule OTHER — — 2020 Resolved
Groundwater Rule OTHER — — 2019 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2017 Resolved
Groundwater Rule OTHER — — 2017 Resolved
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

5 violations are on record since 2015, of which 0 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Entranosa Water Association
PWSID NM3524626
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 92
Service connections 3,225
Systems serving this area 2
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is San Antonito tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 1.30 ppb, 9% of the action level.
Does San Antonito water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to San Antonito? ▼
Entranosa Water Association (PWSID NM3524626), one of 2 systems serving this area. Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2024-05-02. Inspectors recorded 2 significant deficiencies.

What Should San Antonito Residents Do?

1
Read your annual water report
Your supplier publishes a Consumer Confidence Report each July covering the prior year.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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