PFAS in Riderwood, MD Drinking Water
PFAS data for Riderwood, Maryland · 1,600,000 residents · 1 ZIP code
In Riderwood, Maryland, PFAS has been detected in the public water supply — a contaminant that health agencies track because of documented effects associated with prolonged exposure at elevated concentrations.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-05-14
PFAS in Riderwood Tap Water
PFAS has been detected in Riderwood, Maryland drinking water at a maximum level of 0.003 ppt — below the EPA MCL of 4 ppt (PFOA/PFOS individually).
This analysis covers 1,600,000 residents across 1 ZIP code in Riderwood.
Riderwood's overall water quality grade is C (63/100).
Is PFAS in Riderwood Water Safe?
PFAS was detected in Riderwood 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 |
|---|---|---|---|
| 21139 | 1 detections | 4 ppt (PFOA/PFOS individually) | OK |
Average pfas level across Riderwood: 1 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 Riderwood 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.