Is CASTLE ROCK TOWN OF required to publish a Consumer Confidence Report?

Yes. CASTLE ROCK TOWN OF is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.

When is CASTLE ROCK TOWN OF’s next Consumer Confidence Report due?

CASTLE ROCK TOWN OF’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.

What is a Consumer Confidence Report?

A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

CASTLE ROCK, CO · Douglas County

CASTLE ROCK TOWN OF Water System

Consumer Confidence Report status

CASTLE ROCK TOWN OF must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.

As of August 1, 2026, EPA's federal records show no open violations for CASTLE ROCK TOWN OF.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 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: 110,298
Service connections: 27,865
Ownership: local government
Water source: surface water (rivers, lakes, or reservoirs)

CASTLE ROCK TOWN OF is among the 12 largest community water systems in Colorado, serving 110,298 people from surface water.

As of August 1, 2026, its federal record holds 8 entries between 1999 and 2022, all of which EPA lists as closed. Nothing has been added since 2022.

All 8 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves the Radionuclides and Revised Rad Rule, the Surface Water Treatment Rules, and inorganic chemicals.

Violation history

Monitoring, Regular
—
Combined Radium (-226 and -228)
April 1, 2022 – June 30, 2022
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 Uranium
April 1, 2022 – June 30, 2022
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
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
April 1, 2022 – June 30, 2022	Monitoring, Regular	Combined Radium (-226 and -228)	—	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 Uranium	—	Resolved
April 1, 2022 – June 30, 2022	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	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 Public Notification requested1 linked violation
August 8, 2022State Violation/Reminder Notice1 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 Public Notification requested1 linked violation
October 21, 2019State Violation/Reminder Notice1 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 Violation/Reminder Notice1 linked violation
November 26, 2013State Public Notification requested1 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 Notice1 linked violation
February 8, 2007State Violation/Reminder Notice1 linked violation

Common questions

Is CASTLE ROCK TOWN OF required to publish a Consumer Confidence Report?: Yes. CASTLE ROCK TOWN OF is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.
When is CASTLE ROCK TOWN OF’s next Consumer Confidence Report due?: CASTLE ROCK TOWN OF’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does CASTLE ROCK TOWN OF have any open drinking water violations on record?: As of August 1, 2026, EPA's federal records show no open violations for CASTLE ROCK TOWN OF.
What is a Consumer Confidence Report?: A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

Contact

BRANNING, HANNAH

720-733-6041

CASTLE ROCK, CO 80109