Danbury Water Department

Published drinking-water records and contacts for Danbury Water Department. System CT0340011. Review sources and dates; not a real-time water assessment.

System ID: CT0340011
State or territory: CT
Published population served: 62055
System type (source code): CWS

Published records and dates

PFAS / lithium (EPA UCMR 5): 240 — 2024-12-10 – 2025-09-17
Lead and copper monitoring summaries: 109 — 1992-07-01 – 2026-12-31

Missing records here do not mean the provider did not test. Published records are not a real-time assessment of your tap water.

Published testing results

Selected recent records are shown below. Different sampling locations and dates are not interchangeable. These excerpts are not a complete testing history.

“<” means below the stated reporting limit, not zero. A reported measurement alone is not a safety verdict. Read an example

EPA UCMR 5 — most recent imported sample per substance
Substance	Published result	Reporting limit	Sample date	Sampling location
11Cl-PF3OUdS	< 0.005 µg/L	0.005 µg/L	2025-09-17	Margerie TP / 3
4:2 FTS	< 0.003 µg/L	0.003 µg/L	2025-09-17	Margerie TP / 3
6:2 FTS	< 0.005 µg/L	0.005 µg/L	2025-09-17	Margerie TP / 3
8:2 FTS	< 0.005 µg/L	0.005 µg/L	2025-09-17	West Lake TP / 3
9Cl-PF3ONS	< 0.002 µg/L	0.002 µg/L	2025-09-17	Margerie TP / 3
ADONA	< 0.003 µg/L	0.003 µg/L	2025-09-17	West Lake TP / 3
HFPO-DA	< 0.005 µg/L	0.005 µg/L	2025-09-17	Margerie TP / 3
NEtFOSAA	< 0.005 µg/L	0.005 µg/L	2025-09-17	Margerie TP / 3
NFDHA	< 0.02 µg/L	0.02 µg/L	2025-09-17	Margerie TP / 3
NMeFOSAA	< 0.006 µg/L	0.006 µg/L	2025-09-17	Margerie TP / 3
PFBA	< 0.005 µg/L	0.005 µg/L	2025-09-17	Margerie TP / 3
PFBS	0.0043 µg/L	0.003 µg/L	2025-09-17	West Lake TP / 3
PFDA	< 0.003 µg/L	0.003 µg/L	2025-09-17	West Lake TP / 3
PFDoA	< 0.003 µg/L	0.003 µg/L	2025-09-17	West Lake TP / 3
PFEESA	< 0.003 µg/L	0.003 µg/L	2025-09-17	Margerie TP / 3
PFHpA	< 0.003 µg/L	0.003 µg/L	2025-09-17	Margerie TP / 3
PFHpS	< 0.003 µg/L	0.003 µg/L	2025-09-17	Margerie TP / 3
PFHxA	< 0.003 µg/L	0.003 µg/L	2025-09-17	West Lake TP / 3
PFHxS	< 0.003 µg/L	0.003 µg/L	2025-09-17	West Lake TP / 3
PFMBA	< 0.003 µg/L	0.003 µg/L	2025-09-17	West Lake TP / 3
PFMPA	< 0.004 µg/L	0.004 µg/L	2025-09-17	West Lake TP / 3
PFNA	< 0.004 µg/L	0.004 µg/L	2025-09-17	Margerie TP / 3
PFOA	0.0050 µg/L	0.004 µg/L	2025-09-17	Margerie TP / 3
PFOS	< 0.004 µg/L	0.004 µg/L	2025-09-17	Margerie TP / 3
PFPeA	< 0.003 µg/L	0.003 µg/L	2025-09-17	West Lake TP / 3
PFPeS	< 0.004 µg/L	0.004 µg/L	2025-09-17	West Lake TP / 3
PFTA	< 0.008 µg/L	0.008 µg/L	2025-09-17	West Lake TP / 3
PFTrDA	< 0.007 µg/L	0.007 µg/L	2025-09-17	Margerie TP / 3
PFUnA	< 0.002 µg/L	0.002 µg/L	2025-09-17	Margerie TP / 3
lithium	< 9 µg/L	9 µg/L	2025-09-17	West Lake TP / 3

Download all EPA UCMR 5 records (CSV)

Lead and copper: 90th-percentile summaries

These describe a monitoring period across sampled locations, not the result at your home. How to read the 90th percentile

Eight most recent imported monitoring summaries
Substance	Monitoring period	Source quarter
Lead (PB90)	2026-01-01 – 2026-12-31	2026Q3
Lead (PB90)	2026-01-01 – 2026-12-31	2026Q3
Lead (PB90)	2025-01-01 – 2025-12-31	2026Q3
Lead (PB90)	2025-01-01 – 2025-12-31	2026Q3
Lead (PB90)	2024-01-01 – 2024-12-31	2026Q3
Lead (PB90)	2024-01-01 – 2024-12-31	2026Q3
Lead (PB90)	2024-01-01 – 2024-12-31	2026Q3
Lead (PB90)	2024-01-01 – 2024-12-31	2026Q3

Published compliance history

11 imported records. Status is as recorded in the source; historical records are not current advisories. Missing records do not establish that no violations occurred.

Twenty most recent imported compliance records
Rule / record	Period	Recorded status	Health-based (EPA classification)	Source quarter
Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP)	2021-10-01 – 2021-12-31	Resolved	No	2026Q3
Interim and Long Term 1 Enhanced Surface Water Treatment Rule / Monthly Turbidity Exceed (Enhanced SWTR)	2021-07-01 – 2021-07-31	Resolved	Yes	2026Q3
Lead and Copper Rule / Lead Consumer Notice	2020-12-30 – —	Resolved	No	2026Q3
Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP)	2019-07-01 – 2019-09-30	Resolved	No	2026Q3
Stage 1 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP)	2017-10-01 – 2017-12-31	Resolved	No	2026Q3
Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP)	2017-10-01 – 2017-12-31	Resolved	No	2026Q3
Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP)	2017-04-01 – 2017-06-30	Resolved	No	2026Q3
Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP)	2017-04-01 – 2017-06-30	Resolved	No	2026Q3
Stage 1 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP)	2017-04-01 – 2017-06-30	Resolved	No	2026Q3
Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP)	2013-07-01 – 2013-09-30	Archived	No	2026Q3
Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP)	2013-07-01 – 2013-09-30	Archived	No	2026Q3

Source dates and refresh checks

A refresh check is not a sample date. Publication periods, sample dates and checks are shown separately.

EPA SDWIS lead/copper summaries and service areas — source period: — – —; last checked: 2026-10-17
EPA SDWIS contacts and compliance records — source period: — – —; last checked: 2026-10-17
EPA UCMR 5 sample results — source period: 2023-01-03 – 2026-06-17; last checked: 2026-10-17

Administrative contact (EPA filing)

Day, David M.: 203-797-4539

An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.

Official state resources · How to read these records