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Water system · PWSID CO0118010

CASTLE ROCK TOWN OF

CASTLE ROCK, CO · ~106,822 people served

Check your exact address → CASTLE ROCK overview
100
Excellent
PurityRadar safety score

PWSID

CO0118010

State

Colorado

City

CASTLE ROCK

Population served

106,822

Primary source

Surface water

Score history

No change since tracking began Jun 18, 2026.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 100

2 score updates logged since tracking began Jun 18, 2026. Each future EPA re-score adds a point.

PFAS & contaminant readings

Latest detections from EPA’s UCMR5 monitoring (through Feb 2024). Levels in parts per trillion (ppt).

Lithium

24,400 ppt

limit —

No federal limit

PFBA

5.1 ppt

limit —

No federal limit

PFPeA

3 ppt

limit —

No federal limit

Violations & enforcement

19

Violations on record

0

Unaddressed

0

Health-based

41

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Aug 2025. Official EPA record →

Monitoring & reporting · EPA contaminant 0200 began Jun 2025 Resolved
Monitoring & reporting · EPA contaminant 0200 began May 2025 Resolved
Monitoring & reporting · Uranium began Apr 2022 Resolved
Monitoring & reporting · Combined radium-226/228 began Apr 2022 Resolved
Monitoring & reporting · Combined radium-226/228 began Apr 2022 Resolved
Monitoring & reporting · Gross alpha began Apr 2022 Resolved
Monitoring & reporting · Gross alpha began Apr 2022 Resolved
Monitoring & reporting · Uranium began Apr 2022 Resolved
Monitoring & reporting · EPA contaminant 0200 began May 2019 Resolved
Monitoring & reporting · EPA contaminant 0200 began Oct 2013 Resolved
Monitoring & reporting · EPA contaminant 0200 began Sep 2013 Resolved
Monitoring & reporting · Nitrite began Apr 2008 Resolved

Recent enforcement actions

  • State action · SOX Aug 2025
  • State action · SIA Jul 2025
  • State action · SIE Jul 2025
  • State action · SIE Jun 2025
  • State action · SIA Jun 2025
  • State action · SOX Aug 2023
  • State action · SIA Aug 2022
  • State action · SIA Aug 2022

Area water-quality monitoring

Environmental monitoring (rivers, wells, intakes) recorded in this system’s service area in the EPA/USGS Water Quality Portal since 2018 — source/ambient water, not finished tap water. Context for the watershed, not a reading from your tap.

ContaminantMedian · max · samples

Manganese

2 stations · latest May 2025

154 · max 546 ug/L · 30

Copper

2 stations · latest Nov 2024

0.9 · max 2.6 ug/L · 17

Lead

2 stations · latest Nov 2024

2 · max 3 ug/L · 15

Arsenic

2 stations · latest Oct 2024

0 · max 2 ug/L · 14

Source: Water Quality Portal (EPA/USGS/state agencies). Values are as-reported and aren’t health thresholds.

This profile is built from EPA public records for system CO0118010 — SDWIS violations and UCMR5 PFAS sampling. The score is system-level and can’t account for your home’s plumbing (older pipes can add lead at the tap). For health decisions, check your exact address, read the utility’s Consumer Confidence Report, and confirm with your provider.