PFAS in Herndon, VA Drinking Water
PFAS data for Herndon, Virginia · 94,168 residents · 6 ZIP codes
ZipCheckup's reading of PFAS in Herndon, Virginia: the highest detected level is 0.0215 ppt; the EPA limit is 4 ppt (PFOA/PFOS individually). PFAS carries a high health-risk designation.
If you rely on a public water system in Herndon, Virginia, PFAS is a contaminant your utility has been required to test for - and EPA records show it has been detected at measurable levels, making it worth understanding as part of your tap water's detection record.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-07-13
PFAS in Herndon Tap Water
PFAS has been detected in Herndon, Virginia drinking water at a maximum level of 0.0215 detections — relative to the EPA MCL of 4 ppt (PFOA/PFOS individually).
This analysis covers 94,168 residents across 6 ZIP codes in Herndon.
Herndon's overall water quality grade is C (66/100).
Is PFAS in Herndon Water Safe?
PFAS was detected in Herndon 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 |
|---|---|---|---|
| 20170 | 47 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 20171 | 40 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 20192 | 40 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
Average pfas level across Herndon: 42.33 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 Herndon 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.