Public water system · NM3574429
ActiveUnion Del Llano Mdwca
At a glance
Union Del Llano Mdwca (PWSID NM3574429) is an active community water system in Taos County, New Mexico. It reports serving 400 people through 75 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in March 2023.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
400
Service connections
75
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Union Del Llano Mdwca compare with other water systems in Taos County?
By EPA's size categories, Union Del Llano Mdwca is a very small system (500 people or fewer). Taos County has 94 active public water systems. Its population served is about 50% above the county average of 266 people per system, and accounts for 1.6% of the 25,046 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 Union Del Llano 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. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 1,009 New Mexico systems (87%) list groundwater as their primary source.
Who owns and regulates Union Del Llano Mdwca?
EPA lists Union Del Llano 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. 36 of the 94 active systems in Taos County (38%) are also owned by a local government.
Does Union Del Llano Mdwca have drinking water violations?
Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in March 2023. The violations listed here began between November 2017 and March 2023. By type: 6 required treatment not met, 5 public notice, recordkeeping or other and 1 monitoring and reporting. The contaminant or rule involved most often is Groundwater Rule (7 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 |
|---|---|---|---|---|
| 2023-03-18 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2023-03-18 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2022-12-21 | Public notice, recordkeeping or otherFailure to Consult with State · code 20 | Groundwater Rulecode 0700 | No | Resolved |
| 2022-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2018-08-22 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2018-08-22 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2018-08-22 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2018-02-24 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2017-11-23 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2017-11-23 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2017-11-23 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2017-11-23 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | 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.
Union Del Llano Mdwca: frequently asked questions
Who runs Union Del Llano Mdwca?
Union Del Llano Mdwca (PWSID NM3574429) is a community water system owned by a local government. It is regulated by the NM state drinking water program.
How many people does Union Del Llano Mdwca serve?
Union Del Llano Mdwca reports serving 400 people through 75 service connections in Taos County, New Mexico.
Where does Union Del Llano Mdwca get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Union Del Llano Mdwca have any drinking water violations?
Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in March 2023. 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 Union Del Llano 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, 6 are health-based, and the most recent began in March 2023. For current results, consult the system's annual water quality report, EPA ECHO, or the NM state drinking water program.
Where can I find Union Del Llano Mdwca's water quality report?
As a community water system, Union Del Llano 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 Taos County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Taos Municipal Water System | Taos | 5,528 | Community | Groundwater |
| Questa Water System | Taos | 2,337 | Community | Groundwater |
| El Prado Water & Sanitation District | Taos | 1,076 | Community | Groundwater |
| Village of Taos Ski Valley | Taos | 1,025 | Community | Groundwater |
| Llano Quemado Mdwca | Taos | 800 | Community | Groundwater |
| Ranchos De Taos Mdwca | Taos | 750 | Community | Groundwater |
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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, “Union Del Llano Mdwca, PWSID NM3574429, New Mexico”, https://aquacensus.com/water-systems/new-mexico/union-del-llano-mdwca-nm3574429 (data as of October 1, 2026).