Public water system · CO0162200
ActiveDacono City of
At a glance
City of Dacono (PWSID CO0162200) is an active community water system in Weld County, Colorado. It reports serving 6,900 people through 2,420 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list 7 violations for this system; 2 are health-based, and the most recent began in October 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
6,900
Service connections
2,420
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does City of Dacono compare with other water systems in Weld County?
By EPA's size categories, City of Dacono is a medium system (3,301 to 10,000 people). Weld County has 75 active public water systems. Its population served is about 43% above the county average of 4,824 people per system, and accounts for 1.9% of the 361,765 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 Dacono is roughly in line with 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. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 337 Colorado systems (15%) list purchased surface water as their primary source.
Who owns and regulates City of Dacono?
EPA lists City of Dacono 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. 31 of the 75 active systems in Weld County (41%) are also owned by a local government.
Does City of Dacono have drinking water violations?
EPA's records list 7 violations for this system; 2 are health-based, and the most recent began in October 2025. The violations listed here began between August 1995 and October 2025. By type: 4 monitoring and reporting, 1 public notice, recordkeeping or other, 1 required treatment not met and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Haloacetic acids (HAA5) (2 of them). EPA lists 7 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 |
|---|---|---|---|---|
| 2025-10-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2025-10-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2022-02-06 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2022-01-01 | Required treatment not metTreatment Technique No Certif. Operator · code 12 | Stage 1 Disinfectants and Disinfection Byproducts Rulecode 0400 | Yes | Resolved |
| 2016-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2016-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 1995-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
All 7 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 Dacono: frequently asked questions
Who runs City of Dacono?
City of Dacono (PWSID CO0162200) 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 Dacono serve?
City of Dacono reports serving 6,900 people through 2,420 service connections in Weld County, Colorado.
Where does City of Dacono get its water?
EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.
Does City of Dacono have any drinking water violations?
EPA's records list 7 violations for this system; 2 are health-based, and the most recent began in October 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 City of Dacono'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 7 violations for this system; 2 are health-based, and the most recent began in October 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 City of Dacono's water quality report?
As a community water system, City of Dacono 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 Weld County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Greeley City of | Weld | 132,310 | Community | Surface water |
| Firestone Town of | Weld | 27,798 | Community | Purchased surface water |
| Johnstown Town of | Weld | 27,295 | Community | Surface water |
| Windsor Town of | Weld | 23,500 | Community | Purchased surface water |
| Evans City of | Weld | 19,369 | Community | Purchased surface water |
| Frederick Town of | Weld | 17,173 | 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, “Dacono City of, PWSID CO0162200, Colorado”, https://aquacensus.com/water-systems/colorado/dacono-city-of-co0162200 (data as of October 1, 2026).