Utility-reported hardness
Unavailable
Ask your provider or test your tap
Local water dashboard
Official source aggregationWater quality in Danbury, CT 06811
Regional hardness evidence, possible serving systems, EPA compliance history, and the measurements that are—and are not—available for Fairfield County.
Historical measurement record needs context
- Largest possible serving system
- Danbury Water Department
- Source water
- Surface water + Groundwater influenced by surface water + Groundwater
- County
- Fairfield County
- Profile updated
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 →At a glance
What the current records say
EPA quarter 2026Q2
All possible systems
No active flag
0 active health-based records
Measurements by utility
Each result belongs to a specific system.
Utility match
10 systems
Serves 62,055 people system-wide
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
- 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)
| 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
- 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)
| 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
- 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
- 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)
| 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
- 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
- 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)
| 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
- 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
- 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
- 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)
| 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
- 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)
| 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
- 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)
| 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
- 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.
Hardness meter
What does nearby environmental evidence show?
95.1
PPM as CaCO₃
Moderately Hard
PPM
95.1
GPG
5.6
Regional environmental evidence
USGS hardness classification scale
95.1 PPM
Soft
0–60Moderate
61–120Hard
121–180Very hard
181+
0–60Moderate
61–120Hard
121–180Very hard
181+
Parts per million
95.1
mg/L as CaCO₃ equivalent
Grains per gallon
5.6
1 GPG ≈ 17.1 PPM
How to use regional evidence
These samples describe nearby environmental water. They cannot establish whether your tap water is soft or hard. Use a utility result or a tap test for appliance settings and treatment sizing.
USGS sites used
17
Nearest site
4.9 mi
Observation range
Aug 1, 2016–Jun 2, 2026
Regional evidence confidence
High
Median of the latest source-type-aligned hardness observation at each monitoring site within 25 miles. Nearest monitoring location: STILL RIVER AT ROUTE 7 AT BROOKFIELD CENTER, CT (Stream).USGS source documentation ↗Evidence tier: Regional environmental evidence. This value is not used as proof of the serving utility's treated-water hardness.
Regional context
Is 06811 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Danbury median
95 PPM
About the same2 indexed ZIP readings · Range 95.1–95.1 PPM
Connecticut median
89 PPM
6 PPM higher98 indexed ZIP readings · Range 15.8–254 PPM
Evidence-first next steps
Confirm the problem before choosing treatment
This profile can help you ask the right question. It cannot select equipment for a property without a current result from the serving utility or the tap.
Confirm the serving system
ZIP boundaries and utility service areas do not perfectly match. Verify the system on a water bill before relying on system-wide records.
Read the current utility report
A reported action-level record needs context. Check its monitoring period and the utility's current report.
Find an official utility report →Test for the decision you face
Use a tap hardness test before sizing a softener. For health concerns, use a certified laboratory and the correct sampling protocol.
Convert your hardness test result →Nearby indexed reports
More local profiles in Danbury
Estimates can differ across a city because monitoring locations and associated systems differ.
Frequently asked
Water questions for Danbury
Is tap water safe in Danbury?+
EPA ECHO shows no active health-based violation for the associated systems in this reporting snapshot. This does not prove every contaminant is absent; federal records can lag and household plumbing can change tap conditions.
How hard is the water?+
Utility-reported hardness is unavailable in this index. Regional samples do not establish tap-water hardness. Ask your provider or test your tap.
Do I need a water softener?+
Confirm hardness at your tap and consider actual scale or spotting before choosing treatment. Regional environmental values cannot determine whether you need a softener. A softener addresses hardness, not every contaminant.