Public water system · CO0349502

Active

Maroon Lake

At a glance

Maroon Lake (PWSID CO0349502) is an active transient non-community water system in Pitkin County, Colorado. It reports serving 550 people through 5 service connections. Its primary water source is groundwater, and EPA lists it as owned by the federal government. EPA's records list 10 violations for this system; 3 are health-based, and the most recent began in July 2023.

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

Population served

550

Service connections

Primary source

Groundwater

System type

TNCWS

Transient non-community water system

System record

PWSIDCO0349502

System typeTransient non-community water system

Activity statusActive

Population served550

Service connections5

Primary water sourceGroundwater

Owner typeFederal government

Primacy agencyCO state drinking water program

City served—

StateColorado

ZIP—

CountyPitkin County

How does Maroon Lake compare with other water systems in Pitkin County?

By EPA's size categories, Maroon Lake is a small system (501 to 3,300 people). Pitkin County has 49 active public water systems. Its population served is about half of the county average of 1,085 people per system, and accounts for 1% of the 53,175 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 Maroon Lake is about 3.8 times 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 Maroon Lake?

EPA lists Maroon Lake 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. 5 of the 49 active systems in Pitkin County (10%) are also owned by the federal government.

Does Maroon Lake have drinking water violations?

EPA's records list 10 violations for this system; 3 are health-based, and the most recent began in July 2023. The violations listed here began between July 1995 and July 2023. By type: 5 monitoring and reporting, 2 contaminant level above the legal limit, 1 reporting, 1 monitoring and 1 required treatment not met. The contaminant or rule involved most often is Total coliform bacteria (TCR) (4 of them). EPA lists 10 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
2023-07-11	ReportingReport Startup Procedures Cert Form (RTCR) · code 4C	Revised Total Coliform Rulecode 8000	No	Resolved
2023-06-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2023-01-01	Monitoring and reportingMonitoring, Regular · code 03	Nitratecode 1040	No	Resolved
2018-10-18	Required treatment not metTreatment Technique Startup Procedures (RTCR) · code 2D	Revised Total Coliform Rulecode 8000	Yes	Resolved
2004-06-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
2002-01-01	Monitoring and reportingMonitoring, Regular · code 03	Nitratecode 1040	No	Resolved
2001-01-01	Monitoring and reportingMonitoring, Regular · code 03	Nitratecode 1040	No	Resolved
1995-10-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
1995-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
1995-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Acute (TCR) · code 21	Total coliform bacteria (TCR)code 3100	Yes	Resolved

All 10 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.

Maroon Lake: frequently asked questions

Who runs Maroon Lake?

Maroon Lake (PWSID CO0349502) 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 Maroon Lake serve?

Maroon Lake reports serving 550 people through 5 service connections in Pitkin County, Colorado.

Where does Maroon Lake 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 Maroon Lake have any drinking water violations?

EPA's records list 10 violations for this system; 3 are health-based, and the most recent began in July 2023. 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 Maroon Lake'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. EPA's records list 10 violations for this system; 3 are health-based, and the most recent began in July 2023. For current results, consult EPA ECHO, or the CO state drinking water program.

Where can I find Maroon Lake's water quality report?

The annual Consumer Confidence Report requirement applies to community water systems. Maroon Lake 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 Pitkin County

Water system	County	Population served	Type	Source
Aspen City of	Pitkin	31,100	Community	Surface water
Snowmass Village Wsd	Pitkin	6,353	Community	Surface water
Aspen Ski Corp Hi Alpine L9	Pitkin	2,900	Transient non-community	Surface water
Aspen Ski Corp Garrett Gulch	Pitkin	2,630	Transient non-community	Surface water
Aspen Ski Co Sundeck	Pitkin	1,801	Transient non-community	Groundwater under influence of surface water
Aspen Ski Corp Elk Camp	Pitkin	1,380	Transient non-community	Surface water

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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, “Maroon Lake, PWSID CO0349502, Colorado”, https://aquacensus.com/water-systems/colorado/maroon-lake-co0349502 (data as of October 1, 2026).