Public water system · NM3503521

Active

Vallecitos Mdwca

At a glance

Vallecitos Mdwca (PWSID NM3503521) is an active community water system in Rio Arriba County, New Mexico. It reports serving 84 people through 28 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 7 are health-based, and the most recent began in July 2022.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

Service connections

Primary source

Surface water

System type

CWS

Community water system

System record

PWSIDNM3503521

System typeCommunity water system

Activity statusActive

Population served84

Service connections28

Primary water sourceSurface water

Owner typeLocal government

Primacy agencyNM state drinking water program

City servedVallecitos

StateNew Mexico

ZIP—

CountyRio Arriba County

How does Vallecitos Mdwca compare with other water systems in Rio Arriba County?

By EPA's size categories, Vallecitos Mdwca is a very small system (500 people or fewer). Rio Arriba County has 63 active public water systems. Its population served is well below the county average of 463 people per system, and accounts for 0.3% of the 29,192 people reported by systems filed under the county. Across New Mexico, the 1,165 active systems average 1,885 people each. Nationally, the average active community water system reports serving 6,703 people, so Vallecitos Mdwca is well below that figure.

What does “community water system” mean?

A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. New Mexico has 645 active community water systems, 55% of the state's 1,165 active systems. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 37 New Mexico systems (3.2%) list surface water as their primary source.

Who owns and regulates Vallecitos Mdwca?

EPA lists Vallecitos Mdwca as owned by a local government. The NM state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 41 of the 63 active systems in Rio Arriba County (65%) are also owned by a local government.

Does Vallecitos Mdwca have drinking water violations?

Of the 12 most recent violations in EPA's records, 7 are health-based, and the most recent began in July 2022. The violations listed here began between January 2018 and July 2022. By type: 7 required treatment not met, 3 public notice, recordkeeping or other, 1 monitoring and reporting and 1 monitoring. The contaminant or rule involved most often is Interim Enhanced Surface Water Treatment Rule (8 of them). EPA lists 12 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.

Began	Violation	Contaminant or rule	Health-based	Status
2022-07-01	Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38	Interim Enhanced Surface Water Treatment Rulecode 0300	No	Resolved
2019-06-22	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2018-12-05	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2018-07-01	Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Resolved
2018-06-01	Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Resolved
2018-05-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2018-05-01	Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Resolved
2018-04-01	Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Resolved
2018-03-01	Required treatment not metSingle Turbidity Exceed (Enhanced SWTR) · code 43	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Resolved
2018-03-01	Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Resolved
2018-01-08	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2018-01-01	Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Resolved

The 12 most recent violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.

Vallecitos Mdwca: frequently asked questions

Who runs Vallecitos Mdwca?

Vallecitos Mdwca (PWSID NM3503521) is a community water system owned by a local government. It is regulated by the NM state drinking water program.

How many people does Vallecitos Mdwca serve?

Vallecitos Mdwca reports serving 84 people through 28 service connections in Rio Arriba County, New Mexico.

Where does Vallecitos Mdwca get its water?

EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.

Does Vallecitos Mdwca have any drinking water violations?

Of the 12 most recent violations in EPA's records, 7 are health-based, and the most recent began in July 2022. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.

Is Vallecitos Mdwca's water safe to drink?

AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. Of the 12 most recent violations in EPA's records, 7 are health-based, and the most recent began in July 2022. For current results, consult the system's annual water quality report, EPA ECHO, or the NM state drinking water program.

Where can I find Vallecitos Mdwca's water quality report?

As a community water system, Vallecitos Mdwca must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.

Other water systems in Rio Arriba County

Water system	County	Population served	Type	Source
Espanola Water System	Rio Arriba	12,012	Community	Groundwater
Chama Water System	Rio Arriba	1,573	Community	Surface water
Agua Sana Wua	Rio Arriba	1,514	Community	Groundwater
El Rito Regional Water & Waste Water Asn	Rio Arriba	1,200	Community	Groundwater
Greater Chimayo Mdwca	Rio Arriba	1,050	Community	Groundwater
Alcalde Mdwca	Rio Arriba	927	Community	Groundwater

Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.

About this data

Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.

Cite as: AquaCensus, “Vallecitos Mdwca, PWSID NM3503521, New Mexico”, https://aquacensus.com/water-systems/new-mexico/vallecitos-mdwca-nm3503521 (data as of October 1, 2026).