City water profile

Water hardness in Cornwall

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

Utility-reported hardness

Not yet available

Check your provider and source →

State comparison: Unavailable
Evidence comparison rank: —
Matched utilities: 3
Active health records: 3

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.

Aquarion-Cornwall

CT0310011 · Groundwater · 98 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: 0.002 mg/L
Action level: 0.015 mg/L

13% 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.

Kugeman Village

CT0311021 · Groundwater · 54 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: 0.002 mg/L
Action level: 0.015 mg/L

13% of the listed benchmark

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

Violation history (0)

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

Cornwall Water Company

CT0311011 · Groundwater · 48 people served system-wide

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

3 reported active health-based record(s) for this system

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: 5.5e-4 mg/L
Action level: 0.015 mg/L

4% of the listed benchmark

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

Violation history (81)

Imported violation history for Cornwall Water Company
Rule	Status	Period
Consumer Confidence Rule	Resolved	Aug 10, 2025 to Oct 7, 2025
Lead and Copper Rule	Unaddressed	Jul 1, 2025
Consumer Confidence Rule	Resolved	Jul 1, 2025 to Oct 7, 2025
Lead and Copper Rule	Unaddressed	Jan 1, 2025
LEAD AND COPPER RULE REVISIONSHealth-based	Unaddressed	Oct 17, 2024
LEAD AND COPPER RULE REVISIONS	Unaddressed	Oct 17, 2024
Lead and Copper Rule	Unaddressed	Sep 29, 2024
Consumer Confidence Rule	Resolved	Aug 10, 2024 to Oct 7, 2025
Consumer Confidence Rule	Resolved	Jul 1, 2024 to Oct 7, 2025
Public Notice	Resolved	May 16, 2024 to Jun 26, 2024
Public Notice	Resolved	May 16, 2024 to Jun 26, 2024
Public Notice	Resolved	May 16, 2024 to Jun 26, 2024
Public Notice	Resolved	May 16, 2024 to Jun 26, 2024
Public Notice	Resolved	Apr 14, 2024 to Jun 26, 2024
Lead and Copper Rule	Unaddressed	Mar 31, 2024
Nitrate	Resolved	Jan 1, 2024 to Dec 31, 2024
Nitrite	Resolved	Jan 1, 2024 to Dec 31, 2024
Public Notice	Resolved	Dec 2, 2023 to Jun 26, 2024
Public Notice	Resolved	Dec 2, 2023 to Jun 26, 2024
Lead and Copper Rule	Resolved	Jul 1, 2023 to Dec 31, 2023
Public Notice	Resolved	Apr 8, 2023 to Jun 26, 2024
Public Notice	Resolved	Jan 20, 2023 to Jun 26, 2024
Lead and Copper Rule	Unaddressed	Jan 1, 2023
o-Dichlorobenzene	Resolved	Jan 1, 2023 to Dec 31, 2025
p-Dichlorobenzene	Resolved	Jan 1, 2023 to Dec 31, 2025
Vinyl chloride	Resolved	Jan 1, 2023 to Dec 31, 2025
trans-1,2-Dichloroethylene	Resolved	Jan 1, 2023 to Dec 31, 2025
1,1,1-Trichloroethane	Resolved	Jan 1, 2023 to Dec 31, 2025
Carbon tetrachloride	Resolved	Jan 1, 2023 to Dec 31, 2025
1,2-Dichloropropane	Resolved	Jan 1, 2023 to Dec 31, 2025
Trichloroethylene	Resolved	Jan 1, 2023 to Dec 31, 2025
Tetrachloroethylene	Resolved	Jan 1, 2023 to Dec 31, 2025
CHLOROBENZENE	Resolved	Jan 1, 2023 to Dec 31, 2025
Benzene	Resolved	Jan 1, 2023 to Dec 31, 2025
Toluene	Resolved	Jan 1, 2023 to Dec 31, 2025
Ethylbenzene	Resolved	Jan 1, 2023 to Dec 31, 2025
Styrene	Resolved	Jan 1, 2023 to Dec 31, 2025
DICHLOROMETHANE	Resolved	Jan 1, 2023 to Dec 31, 2025
1,1-Dichloroethylene	Resolved	Jan 1, 2023 to Dec 31, 2025
1,2-Dichloroethane	Resolved	Jan 1, 2023 to Dec 31, 2025
1,1,2-Trichloroethane	Resolved	Jan 1, 2023 to Dec 31, 2025
1,2,4-Trichlorobenzene	Resolved	Jan 1, 2023 to Dec 31, 2025
cis-1,2-Dichloroethylene	Resolved	Jan 1, 2023 to Dec 31, 2025
Lead and Copper Rule	Unaddressed	Apr 23, 2022
Revised Total Coliform Rule	Resolved	Apr 1, 2022 to Apr 30, 2022
Public Notice	Resolved	Mar 23, 2022 to Jun 26, 2024
Lead and Copper Rule	Resolved	Oct 1, 2021 to Dec 27, 2021
Revised Total Coliform Rule	Resolved	Apr 1, 2021 to Apr 30, 2021
Endrin	Archived	Jan 1, 2021 to Dec 31, 2023
BHC-GAMMA	Archived	Jan 1, 2021 to Dec 31, 2023
Methoxychlor	Archived	Jan 1, 2021 to Dec 31, 2023
Dalapon	Archived	Jan 1, 2021 to Dec 31, 2023
Diquat	Archived	Jan 1, 2021 to Dec 31, 2023
Glyphosate	Archived	Jan 1, 2021 to Dec 31, 2023
Di(2-ethylhexyl) adipate	Archived	Jan 1, 2021 to Dec 31, 2023
Simazine	Archived	Jan 1, 2021 to Dec 31, 2023
Picloram	Archived	Jan 1, 2021 to Dec 31, 2023
Hexachlorocyclopentadiene	Archived	Jan 1, 2021 to Dec 31, 2023
Aldicarb sulfoxide	Archived	Jan 1, 2021 to Dec 31, 2023
Aldicarb	Archived	Jan 1, 2021 to Dec 31, 2023
LASSO	Archived	Jan 1, 2021 to Dec 31, 2023
Heptachlor	Archived	Jan 1, 2021 to Dec 31, 2023
Benzo(a)pyrene	Archived	Jan 1, 2021 to Dec 31, 2023
Pentachlorophenol	Archived	Jan 1, 2021 to Dec 31, 2023
Total Polychlorinated Biphenyls (PCB)	Archived	Jan 1, 2021 to Dec 31, 2023
ETHYLENE DIBROMIDE	Archived	Jan 1, 2021 to Dec 31, 2023
Chlordane	Archived	Jan 1, 2021 to Dec 31, 2023
Toxaphene	Archived	Jan 1, 2021 to Dec 31, 2023
HEXACHLOROBENZENE	Archived	Jan 1, 2021 to Dec 31, 2023
1,2-DIBROMO-3-CHLOROPROPANE	Archived	Jan 1, 2021 to Dec 31, 2023
Di(2-ethylhexyl) phthalate	Archived	Jan 1, 2021 to Dec 31, 2023
OXAMYL	Archived	Jan 1, 2021 to Dec 31, 2023
Carbofuran	Archived	Jan 1, 2021 to Dec 31, 2023
2,4-D	Archived	Jan 1, 2021 to Dec 31, 2023
Heptachlor epoxide	Archived	Jan 1, 2021 to Dec 31, 2023
2,4,5-TP	Archived	Jan 1, 2021 to Dec 31, 2023
Dinoseb	Archived	Jan 1, 2021 to Dec 31, 2023
Atrazine	Archived	Jan 1, 2021 to Dec 31, 2023
Aldicarb sulfone	Archived	Jan 1, 2021 to Dec 31, 2023
Groundwater RuleHealth-based	Addressed	Sep 1, 2017
Groundwater RuleHealth-based	Addressed	Sep 1, 2017

City summary

What the indexed records say

Cornwall has 1 published ZIP profile across Litchfield County. The regional-evidence median is 205 PPM. The city does not meet the stricter comparison standard.

Because only one ZIP is represented, the city median and range are the same local estimate. It should not be read as multiple independent samples across the community. At least one estimate is marked low confidence, so observation distance and date deserve extra attention.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs

Moderately hard0 ZIPs

Hard0 ZIPs

Very hard1 ZIP

1 of 1 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance: 12.8 miles
Profiles with evidence: 1/1

Confidence labels

High: 0Moderate: 0Low: 1

Observation window: Jun 26, 2017 to Nov 5, 2018.

ZIP directory

Water reports in Cornwall

Open a ZIP for site-level provenance and measurements.

ZIP code

06753

Very Hard

205 PPM

Nearest site: 12.8 mi
Confidence: Low

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

Bridgewater

Litchfield County

254 PPM median

Canaan

Litchfield County

205 PPM median

Litchfield

Litchfield County

92 PPM median

New Milford

Litchfield County

254 PPM median

Norfolk

Litchfield County

72 PPM median

Sharon

Litchfield County

138 PPM median

Search all 52 Connecticut cities →

Questions people ask

About water in Cornwall

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.