Public water system · NM3560007
ActiveMesilla Water System
At a glance
Mesilla Water System (PWSID NM3560007) is an active community water system in Dona Ana County, New Mexico. It reports serving 2,167 people through 827 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, 2 are health-based, and the most recent began in November 2024.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
2,167
Service connections
827
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Mesilla Water System compare with other water systems in Dona Ana County?
By EPA's size categories, Mesilla Water System is a small system (501 to 3,300 people). Dona Ana County has 68 active public water systems. Its population served is about 42% below the county average of 3,744 people per system, and accounts for 0.9% of the 254,574 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 Mesilla Water System 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 Mesilla Water System?
EPA lists Mesilla Water System 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. 23 of the 68 active systems in Dona Ana County (34%) are also owned by a local government.
Does Mesilla Water System have drinking water violations?
Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in November 2024. The violations listed here began between October 2018 and November 2024. By type: 4 public notice, recordkeeping or other, 4 monitoring and reporting, 2 required treatment not met, 1 reporting and 1 monitoring. The contaminant or rule involved most often is Lead and Copper Rule Revisions (2 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 |
|---|---|---|---|---|
| 2024-11-20 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2024-10-17 | ReportingLSL Reporting · code 4G | Lead and Copper Rule Revisionscode 5200 | No | Resolved |
| 2024-10-17 | Required treatment not metLSL Inventory · code 2E | Lead and Copper Rule Revisionscode 5200 | Yes | Resolved |
| 2021-12-19 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2020-11-18 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2020-11-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2020-10-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2020-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Asbestoscode 1094 | No | Resolved |
| 2019-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2019-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2018-10-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | 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.
Mesilla Water System: frequently asked questions
Who runs Mesilla Water System?
Mesilla Water System (PWSID NM3560007) is a community water system owned by a local government. It is regulated by the NM state drinking water program.
How many people does Mesilla Water System serve?
Mesilla Water System reports serving 2,167 people through 827 service connections in Dona Ana County, New Mexico.
Where does Mesilla Water System 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 Mesilla Water System have any drinking water violations?
Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in November 2024. 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 Mesilla Water System'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, 2 are health-based, and the most recent began in November 2024. For current results, consult the system's annual water quality report, EPA ECHO, or the NM state drinking water program.
Where can I find Mesilla Water System's water quality report?
As a community water system, Mesilla Water System 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 Dona Ana County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Las Cruces Municipal Water System | Dona Ana | 98,175 | Community | Groundwater |
| New Mexico State University | Dona Ana | 24,000 | Community | Groundwater |
| Camino Real Regional Utility Authority | Dona Ana | 19,466 | Community | Groundwater |
| Dona Ana Mdwca | Dona Ana | 16,987 | Community | Groundwater |
| Lake Section Water Company | Dona Ana | 14,619 | Community | Groundwater |
| Moongate West | Dona Ana | 13,362 | Community | Groundwater |
Related pages
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, “Mesilla Water System, PWSID NM3560007, New Mexico”, https://aquacensus.com/water-systems/new-mexico/mesilla-water-system-nm3560007 (data as of October 1, 2026).