Public water system · CO0357500

Active

Matterhorn Cg

At a glance

Matterhorn Cg (PWSID CO0357500) is an active transient non-community water system in San Miguel County, Colorado. It reports serving 50 people through 15 service connections. Its primary water source is groundwater, and EPA lists it as owned by the federal government. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in May 2025.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

Service connections

Primary source

Groundwater

System type

TNCWS

Transient non-community water system

System record

PWSIDCO0357500

System typeTransient non-community water system

Activity statusActive

Population served50

Service connections15

Primary water sourceGroundwater

Owner typeFederal government

Primacy agencyCO state drinking water program

City served—

StateColorado

ZIP—

CountySan Miguel County

How does Matterhorn Cg compare with other water systems in San Miguel County?

By EPA's size categories, Matterhorn Cg is a very small system (500 people or fewer). San Miguel County has 20 active public water systems. Its population served is well below the county average of 1,103 people per system, and accounts for 0.2% of the 22,054 people reported by systems filed under the county. Across Colorado, the 2,207 active systems average 3,400 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Matterhorn Cg is about 65% 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. Colorado has 956 active transient non-community water systems, 43% of the state's 2,207 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 1,437 Colorado systems (65%) list groundwater as their primary source.

Who owns and regulates Matterhorn Cg?

EPA lists Matterhorn Cg as owned by the federal government. The CO state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 3 of the 20 active systems in San Miguel County (15%) are also owned by the federal government.

Does Matterhorn Cg have drinking water violations?

Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in May 2025. The violations listed here began between August 2018 and May 2025. By type: 11 monitoring and reporting and 1 reporting. The contaminant or rule involved most often is Surface Water Treatment Rule (6 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
2025-05-01	ReportingReport Sample Result/Fail Monitor (RTCR) · code 4B	Revised Total Coliform Rulecode 8000	No	Resolved
2019-09-01	Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38	Interim Enhanced Surface Water Treatment Rulecode 0300	No	Resolved
2019-09-01	Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36	Surface Water Treatment Rulecode 0200	No	Resolved
2019-08-01	Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36	Surface Water Treatment Rulecode 0200	No	Resolved
2019-08-01	Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38	Interim Enhanced Surface Water Treatment Rulecode 0300	No	Resolved
2019-07-01	Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36	Surface Water Treatment Rulecode 0200	No	Resolved
2019-06-01	Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36	Surface Water Treatment Rulecode 0200	No	Resolved
2019-06-01	Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38	Interim Enhanced Surface Water Treatment Rulecode 0300	No	Resolved
2019-05-01	Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36	Surface Water Treatment Rulecode 0200	No	Resolved
2019-05-01	Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38	Interim Enhanced Surface Water Treatment Rulecode 0300	No	Resolved
2018-08-01	Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36	Surface Water Treatment Rulecode 0200	No	Resolved
2018-08-01	Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38	Interim Enhanced Surface Water Treatment Rulecode 0300	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.

Matterhorn Cg: frequently asked questions

Who runs Matterhorn Cg?

Matterhorn Cg (PWSID CO0357500) is a transient non-community water system owned by the federal government. It is regulated by the CO state drinking water program.

How many people does Matterhorn Cg serve?

Matterhorn Cg reports serving 50 people through 15 service connections in San Miguel County, Colorado.

Where does Matterhorn Cg 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 Matterhorn Cg 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 May 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 Matterhorn Cg'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 May 2025. For current results, consult EPA ECHO, or the CO state drinking water program.

Where can I find Matterhorn Cg's water quality report?

The annual Consumer Confidence Report requirement applies to community water systems. Matterhorn Cg 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 San Miguel County

Water system	County	Population served	Type	Source
Mountain Village Town of	San Miguel	9,700	Community	Groundwater
Telluride Town of	San Miguel	7,900	Community	Surface water
Norwood Water Commission	San Miguel	1,700	Community	Surface water
Telluride Regional Airport	San Miguel	485	Transient non-community	Groundwater
Aldasoro Ranch Hoc	San Miguel	412	Community	Groundwater
Ilium Valley Ws	San Miguel	322	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, “Matterhorn Cg, PWSID CO0357500, Colorado”, https://aquacensus.com/water-systems/colorado/matterhorn-cg-co0357500 (data as of October 1, 2026).