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Public water system record

San Mateo MDWCA

Serves San Mateo, Cibola County, NM · 182 people served

Federal records show 4 health-based violations and 11 monitoring/reporting issues for San Mateo MDWCA in the last ten years, including an unresolved Groundwater Rule violation.

  • NM3525733
  • MILAN
  • NM
  • 182 served

System profile

Source water Groundwater
ZIP 87021
EPA system ID NM3525733

Verify this system on EPA ECHO →

Health-based violations, last 10 years
4
Resolved
3
Unresolved
1
Any acute record
No
Monitoring issues, last 10 years
11

Key facts

  • San Mateo MDWCA draws water from 1 well.
  • Most recent formal enforcement: compliance order (no penalty) by EPA, September 2000.
  • Record on file since 1984, with 11 health-based violations before October 20, 2016.
  • Lead pipe inventory: 0 lead and 63 unknown out of 63 service lines.

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Health-based violations

Since October 2016

Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.

Contaminant Rule family Start date Status Acute
Groundwater Rule
Treatment technique failure
 140 Jun 15, 2023 Resolved No
Groundwater Rule
Treatment technique failure
 140 Sep 21, 2018 Resolved No
Groundwater Rule
Treatment technique failure
 140 Sep 21, 2018 Resolved No
Groundwater Rule
Treatment technique failure
 140 Apr 25, 2016 Active No

Monitoring and reporting issues

Since October 2016

Missed tests or reports, not contaminants found above a limit.

Issue Start date Status
Lead and Copper Rule
Monitoring and reporting
 Oct 1, 2025 Active
Consumer Confidence Rule
OTHER
 Jul 1, 2025 Resolved
Consumer Confidence Rule
OTHER
 Oct 1, 2024 Resolved
Consumer Confidence Rule
OTHER
 Jul 1, 2024 Resolved
E. coli
Monitoring and reporting
 Nov 24, 2023 Resolved
Lead and Copper Rule
Monitoring and reporting
 Oct 1, 2021 Resolved
Consumer Confidence Rule
OTHER
 Oct 1, 2021 Resolved
Public Notice
OTHER
 Dec 20, 2019 Resolved
Consumer Confidence Rule
OTHER
 Oct 1, 2018 Resolved
Consumer Confidence Rule
OTHER
 Oct 1, 2017 Resolved
Public Notice
OTHER
 Jun 18, 2017 Resolved

Full record since 1984

EPA's records for San Mateo MDWCA go back to 1984. Before October 20, 2016 they list 11 health-based violations (9 resolved, 1 not resolved, 1 archived by EPA without a recorded fix) and 27 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1980s 1 0
1990s 2 8
2000s 6 18
2010 to October 19, 2016 2 1
October 20, 2016 to 2019 2 4
2020s 1 7

Most recent health-based violation before October 20, 2016: Groundwater Rule, began April 2016, Active.

Show all 11 health-based violations before October 20, 2016
Contaminant Start date Status
Groundwater Rule
Treatment technique failure
 Apr 25, 2016 Active
Total Coliform
Contaminant limit exceeded
 Sep 1, 2015 Resolved
Total Coliform
Contaminant limit exceeded
 Sep 1, 2002 Resolved
Total Coliform
Contaminant limit exceeded
 Aug 1, 2002 Resolved
Total Coliform
Contaminant limit exceeded
 Dec 1, 2001 Resolved
Total Coliform
Contaminant limit exceeded
 Sep 1, 2001 Resolved
Total Coliform
Contaminant limit exceeded
 Aug 1, 2001 Resolved
Total Coliform
Contaminant limit exceeded
 Jul 1, 2001 Resolved
Total Coliform
Contaminant limit exceeded
 Dec 1, 1999 Resolved
Total Coliform
Contaminant limit exceeded
 Aug 1, 1999 Resolved
Fluoride
Contaminant limit exceeded
 Jul 1, 1984 Archived

Enforcement actions

EPA took 1 formal enforcement action against San Mateo MDWCA in 2000. The most recent was a compliance order (no penalty) in September 2000.

Date By Action Violations covered
Sep 22, 2000 EPA Compliance order (no penalty) 2 violations: Consumer Confidence Rule

What the violations mean

Groundwater Rule

4 incidents

The system did not complete a treatment step or action that the Groundwater Rule requires (a treatment technique violation).

The utility had to notify customers about each of these violations.

Where the water comes from

San Mateo MDWCA draws water from 1 well.

Annual water quality report

San Mateo MDWCA must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.

Systems serving 500 or fewer people may meet the rule by telling customers the report is available on request, so you may need to ask San Mateo MDWCA for a copy.

Find a posted report with EPA's Consumer Confidence Report search

Testing your own water

To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by New Mexico.

Certified drinking water labs by state EPA guidance for private wells