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Community Water System · PWS NM3532517

Block a Well Co-Op

Mentmore, New Mexico 87319 - drinking water served from groundwater sources to 92 people, tracked in EPA SDWIS and UCMR5.

92
People served
175
EPA violations
42
Health-based
Untested
UCMR5 result

The verdict

EPA records 175 drinking-water violations at Block a Well Co-Op, 24% of them health-based - above the New Mexico per-system average.

175
Total EPA violations on record
24%
Health-based (MCL / treatment failure)
92
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Block a Well Co-Op

Block a Well Co-Op is a private-owned community water system that delivers drinking water to 92 residents in Mentmore, New Mexico (McKinley County) through 24 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 175 total violations for this system , of which 42 (24%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 101 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 Coliform (TCR), recorded in 39 violations (MR). 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%).

Block a Well Co-Op's 175 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
92
Total Violations
175
Health-Based Violations
42
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
24
County
McKinley
School/Daycare
No
MCL Violations
6
Monitoring Violations
101
Treatment Tech Violations
36

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 39 2013
Groundwater Rule TT 36 2024
Chlorine MR 34 2008
Consumer Confidence Rule Other 14 2013
Revised Total Coliform Rule MON 12 2023
Lead and Copper Rule MR 6 2009
Coliform (TCR) MCL 6 1997
Public Notice Other 4 2014
Asbestos MR 4 2020
Arsenic MR 1 1980
Mercury MR 1 1980
Cadmium MR 1 1980
Barium MR 1 1980
Selenium MR 1 1980
Chromium MR 1 1980

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 Block a Well Co-Op.

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 NM3532517 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 36 SDWIS / NM3532517 / 0700
2023 Revised Total Coliform Rule MON 12 SDWIS / NM3532517 / 8000
2020 Asbestos MR 4 SDWIS / NM3532517 / 1094
2014 Public Notice Other 4 SDWIS / NM3532517 / 7500
2013 Coliform (TCR) MR 39 SDWIS / NM3532517 / 3100
2013 Consumer Confidence Rule Other 14 SDWIS / NM3532517 / 7000
2009 Lead and Copper Rule MR 6 SDWIS / NM3532517 / 5000
2008 Chlorine MR 34 SDWIS / NM3532517 / 0999
1997 Coliform (TCR) MCL 6 SDWIS / NM3532517 / 3100
1980 Arsenic MR 1 SDWIS / NM3532517 / 1005
1980 Mercury MR 1 SDWIS / NM3532517 / 1035
1980 Cadmium MR 1 SDWIS / NM3532517 / 1015
1980 Barium MR 1 SDWIS / NM3532517 / 1010
1980 Selenium MR 1 SDWIS / NM3532517 / 1045
1980 Chromium MR 1 SDWIS / NM3532517 / 1020

How Block a Well Co-Op Compares

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

Metric Block a Well Co-Op New Mexico avg Federal benchmark
Total violations 175 149 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 42 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 92 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 Block a Well Co-Op water safe to drink? ▼
Block a Well Co-Op (PWS ID: NM3532517) has 175 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 92 people using Groundwater sources.
How many people does Block a Well Co-Op serve? ▼
Block a Well Co-Op serves 92 people in Mentmore, New Mexico. It is a Private-owned system using Groundwater water sources with 24 service connections.
What type of violations does Block a Well Co-Op have? ▼
Block a Well Co-Op has 175 total violations: 42 health-based violations (MCL exceedances or treatment failures), 101 monitoring/reporting violations, and 36 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Block a Well Co-Op water? ▼
No PFAS testing data is available for Block a Well Co-Op under the EPA's UCMR5 monitoring program.
What water source does Block a Well Co-Op use? ▼
Block a Well Co-Op 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.