SAN MATEO MDWCA

New Mexico — Community Water System — PWSID: NM3525733

System Information

PWSID	NM3525733
System Name	SAN MATEO MDWCA
System Type	Community Water System
Water Source	Ground Water
Activity Status	Active
Owner Type	Local
EPA Region	06
Serves School	No
Wholesaler	No
First Reported	Oct 21, 1981
Last Reported	Dec 3, 2025

Location & Contact

State	New Mexico
City	MILAN
ZIP Code	87021
Address	—
Organization	ORTEGA, LLOYD
Phone	505-287-8108

Population & Service

Population Served	182
Service Connections	55

Drinking Water Violations (113)

This water system has 113 violations recorded in the EPA SDWIS database.

Begin Date	End Date	Contaminant	Category	Health-Based	Major	Measured	Federal MCL	State MCL	Status	Return to Compliance	Rule
Jul 1, 2025	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Sep 19, 2025	Consumer Confidence Rule
Jul 1, 2025	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Sep 19, 2025	Consumer Confidence Rule
Oct 1, 2024	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Oct 7, 2024	Consumer Confidence Rule
Oct 1, 2024	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Oct 7, 2024	Consumer Confidence Rule
Jul 1, 2024	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Oct 3, 2024	Consumer Confidence Rule
Jul 1, 2024	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Oct 3, 2024	Consumer Confidence Rule
Nov 24, 2023	—	E. COLI	MR	No	Yes	—	—	—	Resolved	Nov 27, 2023	Ground Water Rule
Nov 24, 2023	—	E. COLI	MR	No	Yes	—	—	—	Resolved	Nov 27, 2023	Ground Water Rule
Nov 24, 2023	—	E. COLI	MR	No	Yes	—	—	—	Resolved	Nov 27, 2023	Ground Water Rule
Oct 1, 2021	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Jul 27, 2022	Lead and Copper Rule
Oct 1, 2021	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Jul 27, 2022	Lead and Copper Rule
Oct 1, 2021	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Jul 27, 2022	Lead and Copper Rule
Oct 1, 2021	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Jul 27, 2022	Lead and Copper Rule
Oct 1, 2021	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Oct 26, 2021	Consumer Confidence Rule
Oct 1, 2021	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Oct 26, 2021	Consumer Confidence Rule
Dec 20, 2019	—	Public Notice	Other	No	No	—	—	—	Resolved	May 22, 2020	Public Notice Rule and Revised PN Rule
Oct 1, 2018	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Nov 19, 2018	Consumer Confidence Rule
Oct 1, 2018	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Nov 19, 2018	Consumer Confidence Rule
Sep 21, 2018	—	Groundwater Rule	TT	Yes	No	—	—	—	Resolved	May 7, 2019	Ground Water Rule
Sep 21, 2018	—	Groundwater Rule	TT	Yes	No	—	—	—	Resolved	Nov 19, 2018	Ground Water Rule
Sep 21, 2018	—	Groundwater Rule	TT	Yes	No	—	—	—	Resolved	Nov 19, 2018	Ground Water Rule
Sep 21, 2018	—	Groundwater Rule	TT	Yes	No	—	—	—	Resolved	Nov 19, 2018	Ground Water Rule
Sep 21, 2018	—	Groundwater Rule	TT	Yes	No	—	—	—	Resolved	Nov 19, 2018	Ground Water Rule
Sep 21, 2018	—	Groundwater Rule	TT	Yes	No	—	—	—	Resolved	May 7, 2019	Ground Water Rule
Sep 21, 2018	—	Groundwater Rule	TT	Yes	No	—	—	—	Resolved	May 7, 2019	Ground Water Rule
Sep 21, 2018	—	Groundwater Rule	TT	Yes	No	—	—	—	Resolved	May 7, 2019	Ground Water Rule
Oct 1, 2017	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Feb 13, 2018	Consumer Confidence Rule
Jun 18, 2017	—	Public Notice	Other	No	No	—	—	—	Resolved	May 27, 2020	Public Notice Rule and Revised PN Rule
Jun 2, 2016	—	Revised Total Coliform Rule	Other	No	No	—	—	—	Resolved	Aug 3, 2016	Revised Total Coliform Rule
Jun 2, 2016	—	Revised Total Coliform Rule	Other	No	No	—	—	—	Resolved	Aug 3, 2016	Revised Total Coliform Rule
Jun 2, 2016	—	Revised Total Coliform Rule	Other	No	No	—	—	—	Resolved	Aug 3, 2016	Revised Total Coliform Rule
Jun 2, 2016	—	Revised Total Coliform Rule	Other	No	No	—	—	—	Resolved	Aug 3, 2016	Revised Total Coliform Rule
Apr 25, 2016	—	Groundwater Rule	TT	Yes	No	—	—	—	Unaddressed	—	Ground Water Rule
Apr 25, 2016	—	Groundwater Rule	TT	Yes	No	—	—	—	Unaddressed	—	Ground Water Rule
Sep 1, 2015	Sep 30, 2015	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Sep 30, 2015	Total Coliform Rule
Sep 1, 2015	Sep 30, 2015	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Sep 30, 2015	Total Coliform Rule
Sep 1, 2015	Sep 30, 2015	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Sep 30, 2015	Total Coliform Rule
Sep 1, 2015	Sep 30, 2015	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Sep 30, 2015	Total Coliform Rule
Apr 1, 2003	Apr 30, 2003	Coliform (TCR)	Other	No	No	—	5% of samples	—	Resolved	Oct 31, 2002	Total Coliform Rule
Apr 1, 2003	Apr 30, 2003	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Apr 30, 2003	Total Coliform Rule
Apr 1, 2003	Apr 30, 2003	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Apr 30, 2003	Total Coliform Rule
Apr 1, 2003	Apr 30, 2003	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Apr 30, 2003	Total Coliform Rule
Apr 1, 2003	Apr 30, 2003	Coliform (TCR)	Other	No	No	—	5% of samples	—	Resolved	Aug 31, 2002	Total Coliform Rule
Oct 1, 2002	Oct 31, 2002	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Dec 31, 2001	Total Coliform Rule
Oct 1, 2002	Oct 31, 2002	Coliform (TCR)	Other	No	No	—	5% of samples	—	Resolved	Sep 30, 2002	Total Coliform Rule
Oct 1, 2002	Oct 31, 2002	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Dec 31, 2001	Total Coliform Rule
Oct 1, 2002	Oct 31, 2002	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Dec 31, 2001	Total Coliform Rule
Oct 1, 2002	Oct 31, 2002	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Dec 31, 2001	Total Coliform Rule
Oct 1, 2002	Oct 31, 2002	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Dec 31, 2001	Total Coliform Rule
Oct 1, 2002	Oct 31, 2002	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Dec 31, 2001	Total Coliform Rule

About This Water System

Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.

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