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Water system · PWSID CT0340011

DANBURY WATER DEPARTMENT

DANBURY, CT · ~62,055 people served

Check your exact address → DANBURY overview

Excellent

PurityRadar safety score

PWSID

CT0340011

State

Connecticut

City

DANBURY

Population served

62,055

Primary source

Surface water

Score history

▼ 10 points — the score moved from 100 to 90 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 90

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 Sep 2025). Levels in parts per trillion (ppt).

PFOA

Perfluorooctanoic acid

5 ppt

limit 4 ppt

Above EPA limit · 1.3×

PFBS

4.3 ppt

limit —

No federal limit

PFHxA

3.6 ppt

limit —

No federal limit

PFPeA

3.4 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Mar 2022. Official EPA record →

Monitoring & reporting · Haloacetic acids (HAA5) began Oct 2021 Resolved

Treatment technique · EPA contaminant 0300 health-based began Jul 2021 Resolved

Monitoring & reporting · Lead & Copper Rule began Dec 2020 Resolved

Monitoring & reporting · Haloacetic acids (HAA5) began Jul 2019 Resolved

Monitoring & reporting · Total trihalomethanes (TTHM) began Oct 2017 Resolved

Monitoring & reporting · Bromate began Oct 2017 Resolved

Monitoring & reporting · Bromate began Apr 2017 Resolved

Monitoring & reporting · Total trihalomethanes (TTHM) began Apr 2017 Resolved

Monitoring & reporting · Haloacetic acids (HAA5) began Apr 2017 Resolved

Other · EPA contaminant 7000 began Jul 2016 Resolved

Monitoring & reporting · Bromate began Apr 2015 Resolved

Monitoring & reporting · Lead & Copper Rule began Jan 2014 Resolved

Recent enforcement actions

State action · SOX Mar 2022
State action · SOX Mar 2022
State action · SIA Mar 2022
State action · SOX Jan 2022
State action · SIF Sep 2021
State action · SOX Sep 2021
State action · SIA Aug 2021
State action · SIE Aug 2021

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

1 station · latest Jul 2023

0.011 · max 0.011 ppm · 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 CT0340011 — 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.