CASTLE ROCK, CO · Douglas County

CASTLE ROCK TOWN OF Water System

Current status

No open violations on record as of July 4, 2026.

This system's next federally required Consumer Confidence Report is due July 1, 2027, under the EPA's revised reporting rule.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed July 4, 2026. This is a record-keeping and public-information tool — it does not replace Colorado’s official records. Always confirm current status with Colorado before making decisions based on this information.

System facts

System ID (PWSID): CO0118010
System type: Community Water System
Population served: 106,822
Service connections: 27,172
Ownership: local government
Water source: surface water (rivers, lakes, or reservoirs)

Violation history

Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
June 1, 2025 – June 30, 2025
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
April 1, 2022 – June 30, 2022
Resolved
Monitoring, Regular
—
Combined Uranium
April 1, 2022 – June 30, 2022
Resolved
Monitoring, Regular
—
Combined Radium (-226 and -228)
April 1, 2022 – June 30, 2022
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
May 1, 2019 – May 31, 2019
Resolved
Monitoring, Regular
—
Nitrate
January 1, 2006 – December 31, 2006
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
June 1, 1999 – June 30, 1999
Resolved

Resolved addressed and confirmed by the state

Period	Violation	Contaminant / rule	Health-based	Status
June 1, 2025 – June 30, 2025	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
April 1, 2022 – June 30, 2022	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Resolved
April 1, 2022 – June 30, 2022	Monitoring, Regular	Combined Uranium	—	Resolved
April 1, 2022 – June 30, 2022	Monitoring, Regular	Combined Radium (-226 and -228)	—	Resolved
May 1, 2019 – May 31, 2019	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
January 1, 2006 – December 31, 2006	Monitoring, Regular	Nitrate	—	Resolved
June 1, 1999 – June 30, 1999	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved

Resolved addressed and confirmed by the state

Enforcement actions

August 7, 2025State Compliance achieved2 linked violations
July 18, 2025State Public Notification requested1 linked violation
July 18, 2025State Violation/Reminder Notice1 linked violation
June 30, 2025State Public Notification requested1 linked violation
June 30, 2025State Violation/Reminder Notice1 linked violation
August 10, 2023State Compliance achieved6 linked violations
August 8, 2022State Violation/Reminder Notice1 linked violation
August 8, 2022State Public Notification requested1 linked violation
August 8, 2022State Violation/Reminder Notice1 linked violation
August 8, 2022State Public Notification requested1 linked violation
August 8, 2022State Violation/Reminder Notice1 linked violation
August 8, 2022State Public Notification requested1 linked violation
August 8, 2022State Violation/Reminder Notice1 linked violation
August 8, 2022State Public Notification requested1 linked violation
August 8, 2022State Violation/Reminder Notice1 linked violation
August 8, 2022State Public Notification requested1 linked violation
August 8, 2022State Violation/Reminder Notice1 linked violation
August 8, 2022State Public Notification requested1 linked violation
October 21, 2019State Violation/Reminder Notice1 linked violation
October 21, 2019State Public Notification requested1 linked violation
July 3, 2019State Compliance achieved1 linked violation
October 5, 2016State Compliance achieved2 linked violations
December 12, 2013State Public Notification requested1 linked violation
December 12, 2013State Violation/Reminder Notice1 linked violation
November 26, 2013State Public Notification requested1 linked violation
November 26, 2013State Violation/Reminder Notice1 linked violation
August 26, 2008State Compliance achieved1 linked violation
July 30, 2008State Violation/Reminder Notice4 linked violations
July 30, 2008State Public Notification requested1 linked violation
April 4, 2008State Compliance achieved2 linked violations
August 13, 2007State Compliance achieved5 linked violations
February 27, 2007State Compliance achieved4 linked violations
February 8, 2007State Violation/Reminder Notice2 linked violations
February 8, 2007State Violation/Reminder Notice1 linked violation
February 8, 2007State Violation/Reminder Notice1 linked violation
February 8, 2007State Violation/Reminder Notice2 linked violations
August 5, 1999State Formal Notice of Violation issued4 linked violations

Contact

BRANNING, HANNAH

720-733-6041

CASTLE ROCK, CO 80109