MyCleanWater

Castle Rock, Colorado Water Quality Report

Water quality data for 10 water systems serving 115,676 people.

100
Excellent
out of 100

Water Source

10
Water Systems
116K
People Served
Surface water, Ground water
Water Source

Detected Contaminants

ContaminantDetected LevelEPA Limit (MCL)Health Guideline% of LimitStatus
lithium30.9 No federal limit10.0 ug/L(EPA/USGS HBSL)
309%
Above guideline
PFBA0.005 No federal limit1000.0 ug/L(EWG)
0%
Below guideline
PFPeA0.005 No federal limit1000.0 ug/L(EWG)
0%
Below guideline

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Compliance & Violations

Active Violations (2)

66

Oct 1, 2025

moderate

66

Oct 1, 2025

moderate

Resolved Violations (498)

36

Jun 1, 2025 — Jun 30, 2025

moderate

36

Jun 1, 2025 — Jun 30, 2025

moderate

36

Jun 1, 2025 — Jun 30, 2025

moderate

36

May 1, 2025 — May 31, 2025

moderate

36

May 1, 2025 — May 31, 2025

moderate

+ 493 more resolved violations

Frequently Asked Questions

Is Castle Rock tap water safe to drink?

Castle Rock's water meets all EPA maximum contaminant levels. However, 3 contaminants were detected at various levels. Some residents may prefer additional filtration for peace of mind.

What contaminants are in Castle Rock tap water?

3 contaminants have been detected in Castle Rock's water supply across 10 water systems. See the full contaminant table above for details.

How can I improve my water quality in Castle Rock?

Install a water filter rated for the specific contaminants found in Castle Rock's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.

Does Castle Rock have any water quality violations?

Yes, Castle Rock currently has 29 active violations. See the violations section above for details.