Public water system · NM3500117
ActiveWhite Cliffs Mdwua
At a glance
White Cliffs Mdwua (PWSID NM3500117) is an active community water system in McKinley County, New Mexico. It reports serving 323 people through 95 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 December 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
323
Service connections
95
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does White Cliffs Mdwua compare with other water systems in McKinley County?
By EPA's size categories, White Cliffs Mdwua is a very small system (500 people or fewer). McKinley County has 27 active public water systems. Its population served is well below the county average of 1,245 people per system, and accounts for 1% of the 33,611 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 White Cliffs Mdwua 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 White Cliffs Mdwua?
EPA lists White Cliffs Mdwua 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. 8 of the 27 active systems in McKinley County (30%) are also owned by a local government.
Does White Cliffs Mdwua have drinking water violations?
Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in December 2025. The violations listed here began between April 2014 and December 2025. By type: 5 public notice, recordkeeping or other, 4 monitoring and reporting, 2 required treatment not met and 1 monitoring. The contaminant or rule involved most often is Groundwater Rule (4 of them). EPA lists 11 as resolved and 1 as unaddressed. 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. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-12-19 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Unaddressed |
| 2024-11-24 | Public notice, recordkeeping or otherFailure to Consult with State · code 20 | Groundwater Rulecode 0700 | No | Resolved |
| 2024-09-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2021-10-09 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2019-12-11 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2019-12-11 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2019-11-21 | Monitoring and reportingMonitoring, Source Water (GWR) · code 34 | E. colicode 3014 | No | Resolved |
| 2019-09-15 | Public notice, recordkeeping or otherFailure to Consult with State · code 20 | Groundwater Rulecode 0700 | No | Resolved |
| 2019-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2015-09-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2014-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2014-04-24 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | 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.
White Cliffs Mdwua: frequently asked questions
Who runs White Cliffs Mdwua?
White Cliffs Mdwua (PWSID NM3500117) is a community water system owned by a local government. It is regulated by the NM state drinking water program.
How many people does White Cliffs Mdwua serve?
White Cliffs Mdwua reports serving 323 people through 95 service connections in McKinley County, New Mexico.
Where does White Cliffs Mdwua 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 White Cliffs Mdwua 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 December 2025. 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 White Cliffs Mdwua'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 December 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the NM state drinking water program.
Where can I find White Cliffs Mdwua's water quality report?
As a community water system, White Cliffs Mdwua 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 McKinley County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Gallup Water System | McKinley | 20,880 | Community | Groundwater |
| Manuelito Rest Area | McKinley | 2,501 | Transient non-community | Groundwater |
| Gamerco Water & Sanitation | McKinley | 1,744 | Community | Purchased groundwater |
| Gallup Port of Entry | McKinley | 1,500 | Transient non-community | Groundwater |
| St Bonaventure Mission | McKinley | 1,350 | Transient non-community | Groundwater |
| Thoreau Water & Sanitation District | McKinley | 1,173 | 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, “White Cliffs Mdwua, PWSID NM3500117, New Mexico”, https://aquacensus.com/water-systems/new-mexico/white-cliffs-mdwua-nm3500117 (data as of October 1, 2026).