Public water system · CO0159040
ActiveDillon Valley District
At a glance
Dillon Valley District (PWSID CO0159040) is an active community water system in Summit County, Colorado. It reports serving 3,063 people through 435 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's records list 4 violations for this system; none is health-based, and the most recent began in November 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
3,063
Service connections
435
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Dillon Valley District compare with other water systems in Summit County?
By EPA's size categories, Dillon Valley District is a small system (501 to 3,300 people). Summit County has 42 active public water systems. Its population served is about 43% above the county average of 2,142 people per system, and accounts for 3.4% of the 89,964 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 Dillon Valley District is about half of 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 Dillon Valley District?
EPA lists Dillon Valley District 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. 15 of the 42 active systems in Summit County (36%) are also owned by a local government.
Does Dillon Valley District have drinking water violations?
EPA's records list 4 violations for this system; none is health-based, and the most recent began in November 2025. The violations listed here began between February 1994 and November 2025. By type: 4 monitoring and reporting. The contaminants or rules involved are Surface Water Treatment Rule, Chlorine, Carbon, total and Total coliform bacteria (TCR). EPA lists 4 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 |
|---|---|---|---|---|
| 2025-11-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2025-10-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2025-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Carbon, totalcode 2920 | No | Resolved |
| 1994-02-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
All 4 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.
Dillon Valley District: frequently asked questions
Who runs Dillon Valley District?
Dillon Valley District (PWSID CO0159040) is a community water system owned by a local government. It is regulated by the CO state drinking water program.
How many people does Dillon Valley District serve?
Dillon Valley District reports serving 3,063 people through 435 service connections in Summit County, Colorado.
Where does Dillon Valley District 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 Dillon Valley District have any drinking water violations?
EPA's records list 4 violations for this system; none is health-based, and the most recent began in November 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 Dillon Valley District'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 4 violations for this system; none is health-based, and the most recent began in November 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the CO state drinking water program.
Where can I find Dillon Valley District's water quality report?
As a community water system, Dillon Valley District 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 Summit County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Breckenridge Town of | Summit | 28,315 | Community | Surface water |
| Snake River Wd | Summit | 9,900 | Community | Groundwater |
| Silverthorne Town of | Summit | 8,400 | Community | Groundwater |
| Copper Mountain Consolidated Md | Summit | 5,785 | Community | Groundwater |
| Frisco Town of | Summit | 4,495 | Community | Surface water |
| Cdot Vail Pass Ra | Summit | 3,302 | 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, “Dillon Valley District, PWSID CO0159040, Colorado”, https://aquacensus.com/water-systems/colorado/dillon-valley-district-co0159040 (data as of October 1, 2026).