PFAS in Castle Rock, CO Drinking Water
PFAS data for Castle Rock, Colorado · 99,741 residents · 3 ZIP codes
ZipCheckup's reading of PFAS in Castle Rock, Colorado: the highest detected level is 0.014 ppt; the EPA limit is 4 ppt (PFOA/PFOS individually). PFAS carries a high health-risk designation.
Water quality records for Castle Rock, Colorado show PFAS detections on file - a finding that places it among the contaminants worth tracking for this area.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-07-13
PFAS in Castle Rock Tap Water
PFAS has been detected in Castle Rock, Colorado drinking water at a maximum level of 0.014 detections — relative to the EPA MCL of 4 ppt (PFOA/PFOS individually).
This analysis covers 99,741 residents across 3 ZIP codes in Castle Rock.
Castle Rock's overall water quality grade is C (68/100).
Is PFAS in Castle Rock Water Safe?
PFAS was detected in Castle Rock water but currently falls within EPA limits. However, some health organizations argue the EPA MCL may not be protective enough.
If you are concerned, a reverse osmosis or granular activated carbon filter can reduce pfas levels further.
PFAS Levels by ZIP Code
| ZIP Code | PFAS Level | EPA Limit | Status |
|---|---|---|---|
| 80108 | 35 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 80104 | 3 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 80109 | 3 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
Average pfas level across Castle Rock: 13.67 ppt
Health Effects of PFAS
- Increased risk of kidney and testicular cancer
- Thyroid disease and immune system suppression
- Reproductive problems and reduced fertility
- Elevated cholesterol and liver effects
- Developmental effects in infants and children
Health risk severity: High. Governed by the PFAS National Primary Drinking Water Regulation (2024).
How PFAS Gets Into Drinking Water
- Firefighting foam (AFFF) used at military bases and airports
- Industrial manufacturing (non-stick coatings, stain-resistant fabrics)
- Wastewater treatment plants that receive industrial discharge
- Landfill leachate from PFAS-containing consumer products
What to Do About PFAS in Castle Rock Water
- Install a reverse osmosis system (most effective — removes 90%+ of PFAS)
- Granular activated carbon (GAC) filters remove some PFAS compounds
- Look for NSF 53 or NSF 58 certification specifically tested for PFAS
- Pitcher filters with activated carbon provide partial reduction
Look for filters certified under NSF 53 / NSF 58 for pfas removal.