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Community Water System · PWS NM3560007

Mesilla Water System

Mesilla, New Mexico 88046 - drinking water served from groundwater sources to 2,167 people, tracked in EPA SDWIS and UCMR5.

2,167
People served
147
EPA violations
28
Health-based
Untested
UCMR5 result

The verdict

EPA records 147 drinking-water violations at Mesilla Water System, 19% of them health-based - below the New Mexico per-system average.

147
Total EPA violations on record
19%
Health-based (MCL / treatment failure)
2,167
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Mesilla Water System

Mesilla Water System is a local-owned community water system that delivers drinking water to 2,167 residents in Mesilla, New Mexico (Dona Ana County) through 827 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 147 total violations for this system , of which 28 (19%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 91 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Groundwater Rule, recorded in 22 violations (TT, 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. Statewide, 70 of 72 UCMR5-tested systems have reported PFAS detections (97.2%).

Mesilla Water System's 147 violations sit below 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
2,167
Total Violations
147
Health-Based Violations
28
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
827
County
Dona Ana
School/Daycare
No
MCL Violations
4
Monitoring Violations
91
Treatment Tech Violations
24

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Groundwater Rule TT 22 2024
Coliform (TCR) MR 21 2012
TTHM MR 20 2019
Total Haloacetic Acids (HAA5) MR 20 2019
Chlorine MR 16 2020
Public Notice Other 11 2021
Consumer Confidence Rule Other 8 2020
Asbestos MR 6 2020
Lead and Copper Rule MR 5 2008
Coliform (TCR) MCL 4 2005
Revised Total Coliform Rule MON 3 2020
LEAD AND COPPER RULE REVISIONS TT 2 2024
LEAD AND COPPER RULE REVISIONS RPT 2 2024

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 Mesilla Water System.

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 NM3560007 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
2024 Groundwater Rule TT 22 SDWIS / NM3560007 / 0700
2024 LEAD AND COPPER RULE REVISIONS TT 2 SDWIS / NM3560007 / 5200
2024 LEAD AND COPPER RULE REVISIONS RPT 2 SDWIS / NM3560007 / 5200
2021 Public Notice Other 11 SDWIS / NM3560007 / 7500
2020 Chlorine MR 16 SDWIS / NM3560007 / 0999
2020 Consumer Confidence Rule Other 8 SDWIS / NM3560007 / 7000
2020 Asbestos MR 6 SDWIS / NM3560007 / 1094
2020 Revised Total Coliform Rule MON 3 SDWIS / NM3560007 / 8000
2019 TTHM MR 20 SDWIS / NM3560007 / 2950
2019 Total Haloacetic Acids (HAA5) MR 20 SDWIS / NM3560007 / 2456
2012 Coliform (TCR) MR 21 SDWIS / NM3560007 / 3100
2008 Lead and Copper Rule MR 5 SDWIS / NM3560007 / 5000
2005 Coliform (TCR) MCL 4 SDWIS / NM3560007 / 3100

How Mesilla Water System Compares

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

Metric Mesilla Water System New Mexico avg Federal benchmark
Total violations 147 149 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 28 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 2,167 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 Mesilla Water System water safe to drink? ▼
Mesilla Water System (PWS ID: NM3560007) has 147 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 2,167 people using Groundwater sources.
How many people does Mesilla Water System serve? ▼
Mesilla Water System serves 2,167 people in Mesilla, New Mexico. It is a Local-owned system using Groundwater water sources with 827 service connections.
What type of violations does Mesilla Water System have? ▼
Mesilla Water System has 147 total violations: 28 health-based violations (MCL exceedances or treatment failures), 91 monitoring/reporting violations, and 24 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Mesilla Water System water? ▼
No PFAS testing data is available for Mesilla Water System under the EPA's UCMR5 monitoring program.
What water source does Mesilla Water System use? ▼
Mesilla Water System 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.