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Water system · PWSID VA6059501

FAIRFAX COUNTY WATER AUTHORITY

HERNDON, VA · ~1,121,613 people served

Check your exact address → HERNDON overview
60
Fair
PurityRadar safety score

PWSID

VA6059501

State

Virginia

City

HERNDON

Population served

1,121,613

Primary source

Surface water

Score history

▼ 40 points — the score moved from 100 to 60 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 60

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 Dec 2024). Levels in parts per trillion (ppt).

PFOA

Perfluorooctanoic acid

6.1 ppt

limit 4 ppt

Above EPA limit · 1.5×

PFOS

Perfluorooctanesulfonic acid

5.7 ppt

limit 4 ppt

Above EPA limit · 1.4×

PFPeA

18 ppt

limit —

No federal limit

PFBA

18 ppt

limit —

No federal limit

PFHxA

14 ppt

limit —

No federal limit

6:2 FTS

9.2 ppt

limit —

No federal limit

PFBS

7 ppt

limit —

No federal limit

PFHpA

4.9 ppt

limit —

No federal limit

Violations & enforcement

No violations are on record for this system in EPA’s SDWIS/ECHO data.

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

Nitrate

7 stations · latest Oct 2024

0.45 · max 1.96 mg/L · 298

Manganese

6 stations · latest Aug 2023

0.048 · max 0.357 mg/l · 244

Fluoride

3 stations · latest Nov 2023

0.04 · max 0.5 mg/l · 61

Arsenic

3 stations · latest Apr 2024

0.2 · max 0.43 ug/L · 9

Copper

3 stations · latest Apr 2024

1.4 · max 1.9 ug/L · 9

Lead

3 stations · latest Apr 2024

0.06 · max 0.45 ug/L · 9

Atrazine

1 station · latest Aug 2022

7.1 · max 7.1 ng/l · 1

Uranium

1 station · latest Aug 2022

0.0201 · max 0.0201 ug/l · 1

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 VA6059501 — 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.