City water profile

Water hardness in Danbury

Find official utility reports, understand hardness, and check the water system serving your home in Danbury, Connecticut.

Utility-reported hardness

Not yet available

Check your provider and source →

State comparison: Unavailable
Evidence comparison rank: —
Matched utilities: 10
Active health records: 0

Your tap water

What does the utility report?

Match the utility name to your water bill. These results describe the utility’s water, not a test at your home. A ZIP can include several water systems.

Utility hardness unavailable in this index

Nearby river or groundwater samples cannot tell us the hardness coming out of your tap. Ask your water provider for total hardness as CaCO₃, or test it at home.

Find an official utility report →

Convert a hardness result →Test your tap →

Match the name on your water bill

Your utility’s measurements and compliance records

These are possible serving systems. A record for one system does not apply to every home in this ZIP. Confirm your provider before interpreting a measurement or notice. Federal records can lag current utility notices.

EPA snapshot: 2026Q2. Historical window begins Jan 1, 2021.

Danbury Water Department

CT0340011 · Surface water · 62,055 people served system-wide

The system names this served city; Census place overlap links the city to this ZCTA.

No active health-based record in this imported snapshot

Find this utility’s official report →

Measurements (1)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 0 mg/L
Action level: 0.015 mg/L

0% of the listed benchmark

Monitoring period: Jan 1, 2025 to Dec 31, 2025

Violation history (2)

Imported violation history for Danbury Water Department
Rule	Status	Period
Total Haloacetic Acids (HAA5)	Resolved	Oct 1, 2021 to Dec 31, 2021
Interim Enhanced Surface Water Treatment RuleHealth-based	Resolved	Jul 1, 2021 to Jul 31, 2021

Bethel Water Dept

CT0090011 · Surface water · 9,507 people served system-wide

The system names this served city; Census place overlap links the city to this ZCTA.

No active health-based record in this imported snapshot

Find this utility’s official report →

Measurements (1)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 0.0014 mg/L
Action level: 0.015 mg/L

9% of the listed benchmark

Monitoring period: Jan 1, 2026 to Jun 30, 2026

Violation history (52)

Imported violation history for Bethel Water Dept
Rule	Status	Period
CARBON, TOTAL	Resolved	Jan 1, 2025 to Jan 31, 2025
CARBON, TOTAL	Resolved	Jan 1, 2025 to Jan 31, 2025
Arsenic	Archived	Jan 1, 2025 to Dec 31, 2025
Cadmium	Archived	Jan 1, 2025 to Dec 31, 2025
Chromium	Archived	Jan 1, 2025 to Dec 31, 2025
Mercury	Archived	Jan 1, 2025 to Dec 31, 2025
Beryllium, Total	Archived	Jan 1, 2025 to Dec 31, 2025
Thallium, Total	Archived	Jan 1, 2025 to Dec 31, 2025
Selenium	Archived	Jan 1, 2025 to Dec 31, 2025
1,2,4-Trichlorobenzene	Resolved	Jan 1, 2025 to Dec 31, 2025
Vinyl chloride	Resolved	Jan 1, 2025 to Dec 31, 2025
1,2-Dichloroethane	Resolved	Jan 1, 2025 to Dec 31, 2025
1,1,1-Trichloroethane	Resolved	Jan 1, 2025 to Dec 31, 2025
Carbon tetrachloride	Resolved	Jan 1, 2025 to Dec 31, 2025
1,1,2-Trichloroethane	Resolved	Jan 1, 2025 to Dec 31, 2025
CHLOROBENZENE	Resolved	Jan 1, 2025 to Dec 31, 2025
Benzene	Resolved	Jan 1, 2025 to Dec 31, 2025
Styrene	Resolved	Jan 1, 2025 to Dec 31, 2025
CYANIDE	Archived	Jan 1, 2025 to Dec 31, 2025
o-Dichlorobenzene	Resolved	Jan 1, 2025 to Dec 31, 2025
Ethylbenzene	Resolved	Jan 1, 2025 to Dec 31, 2025
Tetrachloroethylene	Resolved	Jan 1, 2025 to Dec 31, 2025
Antimony, Total	Archived	Jan 1, 2025 to Dec 31, 2025
p-Dichlorobenzene	Resolved	Jan 1, 2025 to Dec 31, 2025
Nitrate	Resolved	Jan 1, 2025 to Dec 31, 2025
1,2-Dichloropropane	Resolved	Jan 1, 2025 to Dec 31, 2025
DICHLOROMETHANE	Resolved	Jan 1, 2025 to Dec 31, 2025
trans-1,2-Dichloroethylene	Resolved	Jan 1, 2025 to Dec 31, 2025
Trichloroethylene	Resolved	Jan 1, 2025 to Dec 31, 2025
Barium	Archived	Jan 1, 2025 to Dec 31, 2025
Toluene	Resolved	Jan 1, 2025 to Dec 31, 2025
Nitrite	Resolved	Jan 1, 2025 to Dec 31, 2025
Fluoride	Archived	Jan 1, 2025 to Dec 31, 2025
1,1-Dichloroethylene	Resolved	Jan 1, 2025 to Dec 31, 2025
cis-1,2-Dichloroethylene	Resolved	Jan 1, 2025 to Dec 31, 2025
Nickel	Archived	Jan 1, 2025 to Dec 31, 2025
Nitrate	Resolved	Jan 1, 2024 to Dec 31, 2024
Nitrite	Resolved	Jan 1, 2024 to Dec 31, 2024
Lead and Copper Rule	Resolved	Dec 30, 2022 to Dec 15, 2022
Total Haloacetic Acids (HAA5)	Resolved	Jan 1, 2022 to Mar 31, 2022
Thallium, Total	Resolved	Jan 1, 2022 to Dec 31, 2024
Nickel	Resolved	Jan 1, 2022 to Dec 31, 2024
Chromium	Resolved	Jan 1, 2022 to Dec 31, 2024
Arsenic	Resolved	Jan 1, 2022 to Dec 31, 2024
TTHM	Resolved	Jan 1, 2022 to Mar 31, 2022
CYANIDE	Resolved	Jan 1, 2022 to Dec 31, 2024
Selenium	Resolved	Jan 1, 2022 to Dec 31, 2024
Antimony, Total	Resolved	Jan 1, 2022 to Dec 31, 2024
Barium	Resolved	Jan 1, 2022 to Dec 31, 2024
Beryllium, Total	Resolved	Jan 1, 2022 to Dec 31, 2024
Mercury	Resolved	Jan 1, 2022 to Dec 31, 2024
Cadmium	Resolved	Jan 1, 2022 to Dec 31, 2024

Lake Waubeeka Association

CT0340171 · Groundwater influenced by surface water · 712 people served system-wide

The system names this served city; Census place overlap links the city to this ZCTA.

No active health-based record in this imported snapshot

Find this utility’s official report →

Measurements (2)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 0 mg/L
Action level: 0.015 mg/L

0% of the listed benchmark

Monitoring period: Jan 1, 2025 to Dec 31, 2025

Copper (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Above action level

Reported level: 1.9 mg/L
Action level: 1.3 mg/L

146% of the listed benchmark

Monitoring period: Jul 1, 1998 to Dec 31, 1998

Violation history (1)

Imported violation history for Lake Waubeeka Association
Rule	Status	Period
Consumer Confidence Rule	Resolved	Aug 10, 2021 to Aug 10, 2021

Aqua Vista Assoc, Inc

CT0340111 · Groundwater · 388 people served system-wide

The system names this served city; Census place overlap links the city to this ZCTA.

No active health-based record in this imported snapshot

Find this utility’s official report →

Measurements (1)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 0.001 mg/L
Action level: 0.015 mg/L

7% of the listed benchmark

Monitoring period: Jan 1, 2021 to Dec 31, 2023

Violation history (0)

No record returned in this imported window. This is not a guarantee of tap-water safety.

Aquarion-Indian Spring

CT0340191 · Groundwater · 242 people served system-wide

The system names this served city; Census place overlap links the city to this ZCTA.

No active health-based record in this imported snapshot

Find this utility’s official report →

Measurements (1)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 0 mg/L
Action level: 0.015 mg/L

0% of the listed benchmark

Monitoring period: Jan 1, 2025 to Dec 31, 2025

Violation history (2)

Imported violation history for Aquarion-Indian Spring
Rule	Status	Period
TTHM	Resolved	Jan 1, 2021 to Oct 29, 2021
Total Haloacetic Acids (HAA5)	Resolved	Jan 1, 2021 to Oct 29, 2021

Aquarion-Hollandale Estates

CT0340251 · Surface water · 200 people served system-wide

The system names this served city; Census place overlap links the city to this ZCTA.

No active health-based record in this imported snapshot

Find this utility’s official report →

Measurements (1)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 0.001 mg/L
Action level: 0.015 mg/L

7% of the listed benchmark

Monitoring period: Jan 1, 2021 to Dec 31, 2023

Violation history (0)

No record returned in this imported window. This is not a guarantee of tap-water safety.

Hawthorne Terrace Assoc

CT0340151 · Groundwater · 156 people served system-wide

The system names this served city; Census place overlap links the city to this ZCTA.

No active health-based record in this imported snapshot

Find this utility’s official report →

Measurements (2)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 0 mg/L
Action level: 0.015 mg/L

0% of the listed benchmark

Monitoring period: Jul 1, 2025 to Dec 31, 2025

Copper (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Above action level

Reported level: 1.6 mg/L
Action level: 1.3 mg/L

123% of the listed benchmark

Monitoring period: Jan 1, 2014 to Jun 30, 2014

Violation history (2)

Imported violation history for Hawthorne Terrace Assoc
Rule	Status	Period
Lead and Copper Rule	Resolved	Apr 1, 2025 to Apr 8, 2025
Lead and Copper Rule	Resolved	Jan 1, 2022 to Mar 31, 2022

Aquarion-Ken Oaks

CT0340211 · Surface water · 152 people served system-wide

The system names this served city; Census place overlap links the city to this ZCTA.

No active health-based record in this imported snapshot

Find this utility’s official report →

Measurements (1)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 0.001 mg/L
Action level: 0.015 mg/L

7% of the listed benchmark

Monitoring period: Jan 1, 2022 to Dec 31, 2024

Violation history (1)

Imported violation history for Aquarion-Ken Oaks
Rule	Status	Period
Lead and Copper Rule	Resolved	Dec 30, 2021 to Jan 21, 2022

Snug Harbor Development Corp

CT0340231 · Groundwater · 144 people served system-wide

The system names this served city; Census place overlap links the city to this ZCTA.

No active health-based record in this imported snapshot

Find this utility’s official report →

Measurements (1)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 0.001 mg/L
Action level: 0.015 mg/L

7% of the listed benchmark

Monitoring period: Jan 1, 2022 to Dec 31, 2024

Violation history (1)

Imported violation history for Snug Harbor Development Corp
Rule	Status	Period
Lead and Copper Rule	Resolved	Dec 30, 2021 to Dec 7, 2023

Aquarion-Pearce Manor

CT0340081 · Surface water · 133 people served system-wide

The system names this served city; Census place overlap links the city to this ZCTA.

No active health-based record in this imported snapshot

Find this utility’s official report →

Measurements (1)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 0.001 mg/L
Action level: 0.015 mg/L

7% of the listed benchmark

Monitoring period: Jan 1, 2025 to Dec 31, 2025

Violation history (0)

No record returned in this imported window. This is not a guarantee of tap-water safety.

City summary

What the indexed records say

Danbury has 2 published ZIP profiles across Fairfield County. The regional-evidence median is 95 PPM. The city does not meet the stricter comparison standard.

The 95.1–95.1 PPM range shows how much the available ZIP estimates vary within the city label.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs

Moderately hard2 ZIPs

Hard0 ZIPs

Very hard0 ZIPs

2 of 2 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance: 6.6 miles
Profiles with evidence: 2/2

Confidence labels

High: 2Moderate: 0Low: 0

Observation window: Aug 1, 2016 to Jun 2, 2026.

ZIP directory

Water reports in Danbury

Open a ZIP for site-level provenance and measurements.

ZIP code

06810

Moderately Hard

95.1 PPM

Nearest site: 6.6 mi
Confidence: High

View full ZIP evidence →

ZIP code

06811

Moderately Hard

95.1 PPM

Nearest site: 4.9 mi
Confidence: High

View full ZIP evidence →

Practical next steps

Move from index to evidence

1. Open your ZIP. Check distance, dates, confidence, and the associated utility.
2. Read the current CCR. Confirm source water, detections, limits, ranges, and notices.
3. Use a measured hardness result. Confirm health concerns or treatment sizing with the right method.

Continue comparing

Other Connecticut communities

Bethel

Fairfield County

95 PPM median

Bridgeport

Fairfield County

89 PPM median

Greenwich

Fairfield County

119 PPM median

New Canaan

Fairfield County

114 PPM median

Newtown

Fairfield County

92 PPM median

Norwalk

Fairfield County

114 PPM median

Search all 52 Connecticut cities →

Questions people ask

About water in Danbury

Is the water hard?

Check the utility-reported result above when available. Nearby environmental samples cannot establish tap-water hardness. Ask your provider or test your tap.

Is the tap water safe?

Compliance history is utility-wide and cannot guarantee conditions at every tap. Check current notices and test when address-specific evidence is needed.

Do I need treatment?

Choose treatment only after confirming the problem at the property. A softener targets hardness; contaminant treatment requires a matching, verified performance claim.