Public water system · NM3591827
ActiveMonticello Canyon Dwca
At a glance
Monticello Canyon Dwca (PWSID NM3591827) is an active transient non-community water system in Sierra County, New Mexico. It reports serving 63 people through 30 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, none is health-based, and the most recent began in April 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
63
Service connections
30
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Monticello Canyon Dwca compare with other water systems in Sierra County?
By EPA's size categories, Monticello Canyon Dwca is a very small system (500 people or fewer). Sierra County has 21 active public water systems. Its population served is well below the county average of 550 people per system, and accounts for 0.5% of the 11,551 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 transient non-community water system reports serving 144 people, so Monticello Canyon Dwca is about 56% below that figure.
What does “transient non-community water system” mean?
A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. New Mexico has 369 active transient non-community water systems, 32% 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 Monticello Canyon Dwca?
EPA lists Monticello Canyon Dwca 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. 8 of the 21 active systems in Sierra County (38%) are also privately owned.
Does Monticello Canyon Dwca have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in April 2025. The violations listed here began between June 2016 and April 2025. By type: 7 public notice, recordkeeping or other and 5 monitoring. The contaminant or rule involved most often is Revised Total Coliform Rule (6 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 |
|---|---|---|---|---|
| 2025-04-25 | Public notice, recordkeeping or otherPublic Notification Violation without NPDWR Violation · code 76 | Public Noticecode 7500 | No | Unaddressed |
| 2024-07-11 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2023-04-12 | Public notice, recordkeeping or otherFailure to Consult with State · code 20 | Groundwater Rulecode 0700 | No | Resolved |
| 2023-03-19 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2022-10-30 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2022-08-07 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2022-02-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2021-08-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2021-06-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2016-08-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2016-07-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2016-06-02 | Public notice, recordkeeping or otherSample Siting Plan Errors (RTCR) · code 5A | Revised Total Coliform Rulecode 8000 | 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.
Monticello Canyon Dwca: frequently asked questions
Who runs Monticello Canyon Dwca?
Monticello Canyon Dwca (PWSID NM3591827) is a transient non-community water system privately owned. It is regulated by the NM state drinking water program.
How many people does Monticello Canyon Dwca serve?
Monticello Canyon Dwca reports serving 63 people through 30 service connections in Sierra County, New Mexico.
Where does Monticello Canyon Dwca 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 Monticello Canyon Dwca have any drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in April 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 Monticello Canyon Dwca'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, none is health-based, and the most recent began in April 2025. For current results, consult EPA ECHO, or the NM state drinking water program.
Where can I find Monticello Canyon Dwca's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Monticello Canyon Dwca is a transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.
Other water systems in Sierra County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Truth Or Consequences | Sierra | 6,783 | Community | Groundwater |
| Elephant Butte Water System | Sierra | 2,286 | Community | Groundwater |
| Elephant Butte, City of | Sierra | 1,350 | Community | Groundwater |
| Desert View Rv Park | Sierra | 220 | Transient non-community | Groundwater |
| Hillsboro Mdwca | Sierra | 172 | Community | Groundwater |
| National Rcs Test Facility | Sierra | 100 | Non-transient non-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, “Monticello Canyon Dwca, PWSID NM3591827, New Mexico”, https://aquacensus.com/water-systems/new-mexico/monticello-canyon-dwca-nm3591827 (data as of October 1, 2026).