Public water system · NM3540007
ActiveSt Johns MHP
At a glance
St Johns MHP (PWSID NM3540007) is an active community water system in Dona Ana County, New Mexico. It reports serving 431 people through 167 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in December 2024.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
431
Service connections
167
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does St Johns MHP compare with other water systems in Dona Ana County?
By EPA's size categories, St Johns MHP is a very small system (500 people or fewer). Dona Ana County has 68 active public water systems. Its population served is well below the county average of 3,744 people per system, and accounts for 0.2% 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 St Johns MHP 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 St Johns MHP?
EPA lists St Johns MHP as privately owned. 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. 35 of the 68 active systems in Dona Ana County (51%) are also privately owned.
Does St Johns MHP have drinking water violations?
Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in December 2024. The violations listed here began between September 2013 and December 2024. By type: 5 public notice, recordkeeping or other, 3 required treatment not met, 2 monitoring and reporting and 2 contaminant level above the legal limit. The contaminant or rule involved most often is Public Notice (4 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 |
|---|---|---|---|---|
| 2024-12-18 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2024-03-16 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2024-01-25 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2024-01-25 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2024-01-25 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2023-10-30 | Public notice, recordkeeping or otherFailure to Consult with State · code 20 | Groundwater Rulecode 0700 | No | Resolved |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Asbestoscode 1094 | No | Resolved |
| 2018-02-04 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2017-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Uraniumcode 4006 | Yes | Resolved |
| 2015-01-16 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2013-12-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2013-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | 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.
St Johns MHP: frequently asked questions
Who runs St Johns MHP?
St Johns MHP (PWSID NM3540007) is a community water system privately owned. It is regulated by the NM state drinking water program.
How many people does St Johns MHP serve?
St Johns MHP reports serving 431 people through 167 service connections in Dona Ana County, New Mexico.
Where does St Johns MHP 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 St Johns MHP have any drinking water violations?
Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in December 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 St Johns MHP'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, 5 are health-based, and the most recent began in December 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 St Johns MHP's water quality report?
As a community water system, St Johns MHP 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 |
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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, “St Johns MHP, PWSID NM3540007, New Mexico”, https://aquacensus.com/water-systems/new-mexico/st-johns-mhp-nm3540007 (data as of October 1, 2026).