Public water system · CO0124147
ActiveBlack Hawk City of
At a glance
City of Black Hawk (PWSID CO0124147) is an active community water system in Gilpin County, Colorado. It reports serving 15,167 people through 117 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in September 2021.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
15,167
Service connections
117
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does City of Black Hawk compare with other water systems in Gilpin County?
By EPA's size categories, City of Black Hawk is a large system (10,001 to 100,000 people). Gilpin County has 20 active public water systems, and City of Black Hawk is the largest of them by population served. Its population served is about 13 times the county average of 1,125 people per system, and accounts for 67% of the 22,489 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 Black Hawk is about 126% above 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 Black Hawk?
EPA lists City of Black Hawk 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. 5 of the 20 active systems in Gilpin County (25%) are also owned by a local government.
Does City of Black Hawk have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in September 2021. The violations listed here began between January 2018 and September 2021. By type: 11 monitoring and reporting and 1 monitoring. The contaminants or rules involved are Chlorite, Total trihalomethanes (TTHM), Haloacetic acids (HAA5) and Surface Water Treatment Rule. 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 |
|---|---|---|---|---|
| 2021-09-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chloritecode 1009 | No | Resolved |
| 2020-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2020-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2020-02-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2020-02-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2020-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2018-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | cis-1,2-Dichloroethylenecode 2380 | No | Resolved |
| 2018-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2018-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | o-Dichlorobenzenecode 2968 | No | Resolved |
| 2018-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,2-Dichloroethanecode 2980 | No | Resolved |
| 2018-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Dichloromethanecode 2964 | No | Resolved |
| 2018-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,1-Dichloroethylenecode 2977 | 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.
City of Black Hawk: frequently asked questions
Who runs City of Black Hawk?
City of Black Hawk (PWSID CO0124147) 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 Black Hawk serve?
City of Black Hawk reports serving 15,167 people through 117 service connections in Gilpin County, Colorado.
Where does City of Black Hawk 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 Black Hawk 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 September 2021. 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 Black Hawk'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 September 2021. 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 Black Hawk's water quality report?
As a community water system, City of Black Hawk 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 Gilpin County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Central City City of | Gilpin | 3,750 | Community | Surface water |
| Gilpin County School | Gilpin | 562 | Non-transient non-community | Groundwater |
| Z-Stop | Gilpin | 500 | Transient non-community | Groundwater |
| Columbine Cg | Gilpin | 376 | Transient non-community | Groundwater |
| Cold Springs Cg | Gilpin | 304 | Transient non-community | Groundwater |
| Base Camp at Golden Gate Canyon | Gilpin | 302 | Transient non-community | Groundwater |
Related pages
Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “Black Hawk City of, PWSID CO0124147, Colorado”, https://aquacensus.com/water-systems/colorado/black-hawk-city-of-co0124147 (data as of October 1, 2026).