Public water system · CO0139321
ActiveGrand Junction City of
At a glance
City of Grand Junction (PWSID CO0139321) is an active community water system in Mesa County, Colorado. It reports serving 26,000 people through 9,300 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's records list 6 violations for this system; 2 are health-based, and the most recent began in January 2018.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
26,000
Service connections
9,300
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does City of Grand Junction compare with other water systems in Mesa County?
By EPA's size categories, City of Grand Junction is a large system (10,001 to 100,000 people). Mesa County has 30 active public water systems, and City of Grand Junction is the 3rd-largest of them by population served. Its population served is about 4.8 times the county average of 5,438 people per system, and accounts for 16% of the 163,137 people reported by systems filed under the county. Across Colorado, the 2,207 active systems average 3,400 people each. Nationally, the average active community water system reports serving 6,703 people, so City of Grand Junction is about 3.9 times 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. Colorado has 1,068 active community water systems, 48% of the state's 2,207 active systems. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 228 Colorado systems (10%) list surface water as their primary source.
Who owns and regulates City of Grand Junction?
EPA lists City of Grand Junction as owned by a local 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. 11 of the 30 active systems in Mesa County (37%) are also owned by a local government.
Does City of Grand Junction have drinking water violations?
EPA's records list 6 violations for this system; 2 are health-based, and the most recent began in January 2018. The violations listed here began between March 1993 and January 2018. By type: 4 monitoring and reporting and 2 contaminant level above the legal limit. The contaminant or rule involved most often is E. coli (2 of them). EPA lists 6 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 |
|---|---|---|---|---|
| 2018-01-01 | Monitoring and reportingMonitoring, Source Water (LT2) · code 32 | E. colicode 3014 | No | Resolved |
| 2016-11-01 | Monitoring and reportingMonitoring, Source Water (LT2) · code 32 | Cryptosporidiumcode 3015 | No | Resolved |
| 2016-11-01 | Monitoring and reportingMonitoring, Source Water (LT2) · code 32 | Turbiditycode 0100 | No | Resolved |
| 2016-11-01 | Monitoring and reportingMonitoring, Source Water (LT2) · code 32 | E. colicode 3014 | No | Resolved |
| 1993-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1993-03-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
All 6 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.
City of Grand Junction: frequently asked questions
Who runs City of Grand Junction?
City of Grand Junction (PWSID CO0139321) is a community water system owned by a local government. It is regulated by the CO state drinking water program.
How many people does City of Grand Junction serve?
City of Grand Junction reports serving 26,000 people through 9,300 service connections in Mesa County, Colorado.
Where does City of Grand Junction get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does City of Grand Junction have any drinking water violations?
EPA's records list 6 violations for this system; 2 are health-based, and the most recent began in January 2018. 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 City of Grand Junction'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 6 violations for this system; 2 are health-based, and the most recent began in January 2018. For current results, consult the system's annual water quality report, EPA ECHO, or the CO state drinking water program.
Where can I find City of Grand Junction's water quality report?
As a community water system, City of Grand Junction 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 Mesa County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Ute Wcd | Mesa | 92,580 | Community | Surface water |
| Clifton Wd | Mesa | 34,500 | Community | Surface water |
| Palisade Town of | Mesa | 3,060 | Community | Surface water |
| Debeque Town of | Mesa | 911 | Community | Surface water |
| Midlands Village | Mesa | 893 | Community | Purchased surface water |
| Candlewood Park | Mesa | 800 | Community | Purchased 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, “Grand Junction City of, PWSID CO0139321, Colorado”, https://aquacensus.com/water-systems/colorado/grand-junction-city-of-co0139321 (data as of October 1, 2026).