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Community Water System · PWS NM3527920

San Jon Water Supply

San Jon, New Mexico 88434 - drinking water served from groundwater sources to 360 people, tracked in EPA SDWIS and UCMR5.

360
People served
129
EPA violations
72
Health-based
Untested
UCMR5 result

The verdict

EPA records 129 drinking-water violations at San Jon Water Supply, 56% of them health-based - below the New Mexico per-system average.

129
Total EPA violations on record
56%
Health-based (MCL / treatment failure)
360
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: San Jon Water Supply

San Jon Water Supply is a local-owned community water system that delivers drinking water to 360 residents in San Jon, New Mexico (Quay County) through 158 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 129 total violations for this system , of which 72 (56%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 31 monitoring and reporting violations are on file. The most recent violation on record dates to 2005.

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

San Jon Water Supply's 129 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
360
Total Violations
129
Health-Based Violations
72
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
158
County
Quay
School/Daycare
No
MCL Violations
72
Monitoring Violations
31
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Fluoride MCL 72 2004
Lead and Copper Rule MR 8 1996
Consumer Confidence Rule Other 4 2004
Combined Uranium MR 4 2002
Radium-226 MR 4 2002
Radium-228 MR 4 2002
Gross Beta Particle Activity MR 4 2002
Gross Alpha, Excl. Radon and U MR 4 2002
Asbestos MR 2 2002
Public Notice Other 1 2005
Coliform (TCR) MR 1 2003

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 Jon Water Supply.

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 NM3527920 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
2005 Public Notice Other 1 SDWIS / NM3527920 / 7500
2004 Fluoride MCL 72 SDWIS / NM3527920 / 1025
2004 Consumer Confidence Rule Other 4 SDWIS / NM3527920 / 7000
2003 Coliform (TCR) MR 1 SDWIS / NM3527920 / 3100
2002 Combined Uranium MR 4 SDWIS / NM3527920 / 4006
2002 Radium-226 MR 4 SDWIS / NM3527920 / 4020
2002 Radium-228 MR 4 SDWIS / NM3527920 / 4030
2002 Gross Beta Particle Activity MR 4 SDWIS / NM3527920 / 4100
2002 Gross Alpha, Excl. Radon and U MR 4 SDWIS / NM3527920 / 4000
2002 Asbestos MR 2 SDWIS / NM3527920 / 1094
1996 Lead and Copper Rule MR 8 SDWIS / NM3527920 / 5000

How San Jon Water Supply Compares

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

Metric San Jon Water Supply New Mexico avg Federal benchmark
Total violations 129 149 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 72 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 360 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 San Jon Water Supply water safe to drink? ▼
San Jon Water Supply (PWS ID: NM3527920) has 129 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 360 people using Groundwater sources.
How many people does San Jon Water Supply serve? ▼
San Jon Water Supply serves 360 people in San Jon, New Mexico. It is a Local-owned system using Groundwater water sources with 158 service connections.
What type of violations does San Jon Water Supply have? ▼
San Jon Water Supply has 129 total violations: 72 health-based violations (MCL exceedances or treatment failures), 31 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in San Jon Water Supply water? ▼
No PFAS testing data is available for San Jon Water Supply under the EPA's UCMR5 monitoring program.
What water source does San Jon Water Supply use? ▼
San Jon Water Supply 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.