City water profile

Water hardness in Durham

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

Utility-reported hardness

Not yet available

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State comparison: Unavailable
Evidence comparison rank: —
Matched utilities: 7
Active health records: 4

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.

Durham Center Division

CT0380021 · Surface water · 1,601 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: Jul 1, 2025 to Dec 31, 2025

Violation history (4)

Imported violation history for Durham Center Division
Rule	Status	Period
Lead and Copper Rule	Resolved	Sep 29, 2025 to Oct 9, 2025
Lead and Copper Rule	Resolved	Mar 31, 2024 to Apr 24, 2024
Public Notice	Unaddressed	May 4, 2018
Public Notice	Unaddressed	Jan 6, 2018

Yeshiva Of Waterbury-Durham Campus

CT0380041 · Groundwater · 490 people served system-wide

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

1 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: 0 mg/L
Action level: 0.015 mg/L

0% of the listed benchmark

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

Violation history (51)

Imported violation history for Yeshiva Of Waterbury-Durham Campus
Rule	Status	Period
Lead and Copper Rule	Resolved	Sep 29, 2025 to Oct 7, 2025
Lead and Copper Rule	Resolved	Apr 1, 2025 to Apr 7, 2025
Endrin	Resolved	Jan 1, 2025 to Dec 31, 2025
Toxaphene	Resolved	Jan 1, 2025 to Dec 31, 2025
Glyphosate	Resolved	Jan 1, 2025 to Dec 31, 2025
OXAMYL	Resolved	Jan 1, 2025 to Dec 31, 2025
Picloram	Resolved	Jan 1, 2025 to Dec 31, 2025
Dinoseb	Resolved	Jan 1, 2025 to Dec 31, 2025
Hexachlorocyclopentadiene	Resolved	Jan 1, 2025 to Dec 31, 2025
Aldicarb sulfoxide	Resolved	Jan 1, 2025 to Dec 31, 2025
Aldicarb sulfone	Resolved	Jan 1, 2025 to Dec 31, 2025
Aldicarb	Resolved	Jan 1, 2025 to Dec 31, 2025
Atrazine	Resolved	Jan 1, 2025 to Dec 31, 2025
LASSO	Resolved	Jan 1, 2025 to Dec 31, 2025
Heptachlor	Resolved	Jan 1, 2025 to Dec 31, 2025
2,4-D	Resolved	Jan 1, 2025 to Dec 31, 2025
Pentachlorophenol	Resolved	Jan 1, 2025 to Dec 31, 2025
Total Polychlorinated Biphenyls (PCB)	Resolved	Jan 1, 2025 to Dec 31, 2025
ETHYLENE DIBROMIDE	Resolved	Jan 1, 2025 to Dec 31, 2025
Benzo(a)pyrene	Resolved	Jan 1, 2025 to Dec 31, 2025
Diquat	Resolved	Jan 1, 2025 to Dec 31, 2025
Carbofuran	Resolved	Jan 1, 2025 to Dec 31, 2025
Methoxychlor	Resolved	Jan 1, 2025 to Dec 31, 2025
Heptachlor epoxide	Resolved	Jan 1, 2025 to Dec 31, 2025
HEXACHLOROBENZENE	Resolved	Jan 1, 2025 to Dec 31, 2025
Di(2-ethylhexyl) adipate	Resolved	Jan 1, 2025 to Dec 31, 2025
2,4,5-TP	Resolved	Jan 1, 2025 to Dec 31, 2025
Dalapon	Resolved	Jan 1, 2025 to Dec 31, 2025
Chlordane	Resolved	Jan 1, 2025 to Dec 31, 2025
1,2-DIBROMO-3-CHLOROPROPANE	Resolved	Jan 1, 2025 to Dec 31, 2025
BHC-GAMMA	Resolved	Jan 1, 2025 to Dec 31, 2025
Simazine	Resolved	Jan 1, 2025 to Dec 31, 2025
Di(2-ethylhexyl) phthalate	Resolved	Jan 1, 2025 to Dec 31, 2025
LEAD AND COPPER RULE REVISIONS	Unaddressed	Oct 17, 2024
LEAD AND COPPER RULE REVISIONSHealth-based	Unaddressed	Oct 17, 2024
Lead and Copper Rule	Resolved	Sep 29, 2024 to Apr 8, 2025
Public Notice	Resolved	Apr 19, 2024 to May 30, 2024
Revised Total Coliform RuleHealth-based	Resolved	Jan 30, 2024 to Feb 27, 2024
E. COLI	Resolved	Jan 3, 2024 to Jan 26, 2024
Lead and Copper Rule	Unaddressed	Jan 1, 2024
Lead and Copper Rule	Resolved	Sep 29, 2023 to Jun 7, 2024
Revised Total Coliform Rule	Resolved	May 1, 2023 to May 31, 2023
Chlorine	Resolved	May 1, 2023 to Jun 1, 2023
Revised Total Coliform Rule	Resolved	Apr 1, 2023 to Apr 30, 2023
Chlorine	Resolved	Apr 1, 2023 to Jun 30, 2023
Public Notice	Resolved	Aug 19, 2022 to Jan 20, 2023
Lead and Copper Rule	Resolved	Jul 1, 2022 to Dec 31, 2022
Lead and Copper Rule	Resolved	Apr 1, 2022 to Jan 21, 2023
Lead and Copper Rule	Resolved	Jul 1, 2021 to Dec 31, 2021
Lead and Copper Rule	Resolved	Apr 1, 2021 to Jan 21, 2023
Lead and Copper Rule	Addressed	Jul 1, 2012

Blue Trails Water Association

CT0990011 · Groundwater · 224 people served system-wide

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

1 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: 0.0024 mg/L
Action level: 0.015 mg/L

16% of the listed benchmark

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

Violation history (32)

Imported violation history for Blue Trails Water Association
Rule	Status	Period
Lead and Copper Rule	Unaddressed	Oct 1, 2025
Consumer Confidence Rule	Resolved	Jul 1, 2025 to Jul 24, 2025
1,2,4-Trichlorobenzene	Resolved	Jan 1, 2025 to Dec 31, 2025
o-Dichlorobenzene	Resolved	Jan 1, 2025 to Dec 31, 2025
1,1-Dichloroethylene	Resolved	Jan 1, 2025 to Dec 31, 2025
trans-1,2-Dichloroethylene	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
1,2-Dichloropropane	Resolved	Jan 1, 2025 to Dec 31, 2025
Trichloroethylene	Resolved	Jan 1, 2025 to Dec 31, 2025
1,1,2-Trichloroethane	Resolved	Jan 1, 2025 to Dec 31, 2025
Tetrachloroethylene	Resolved	Jan 1, 2025 to Dec 31, 2025
CHLOROBENZENE	Resolved	Jan 1, 2025 to Dec 31, 2025
Toluene	Resolved	Jan 1, 2025 to Dec 31, 2025
Styrene	Resolved	Jan 1, 2025 to Dec 31, 2025
p-Dichlorobenzene	Resolved	Jan 1, 2025 to Dec 31, 2025
cis-1,2-Dichloroethylene	Resolved	Jan 1, 2025 to Dec 31, 2025
1,2-Dichloroethane	Resolved	Jan 1, 2025 to Dec 31, 2025
Benzene	Resolved	Jan 1, 2025 to Dec 31, 2025
Ethylbenzene	Resolved	Jan 1, 2025 to Dec 31, 2025
DICHLOROMETHANE	Resolved	Jan 1, 2025 to Dec 31, 2025
Vinyl chloride	Resolved	Jan 1, 2025 to Dec 31, 2025
LEAD AND COPPER RULE REVISIONS	Unaddressed	Oct 17, 2024
LEAD AND COPPER RULE REVISIONSHealth-based	Unaddressed	Oct 17, 2024
Consumer Confidence Rule	Resolved	Jul 1, 2024 to Aug 5, 2024
Lead and Copper Rule	Resolved	Mar 31, 2024 to May 13, 2024
Lead and Copper Rule	Resolved	Sep 29, 2023 to May 13, 2024
Consumer Confidence Rule	Resolved	Jul 1, 2023 to Aug 7, 2023
Public Notice	Resolved	Jul 13, 2022 to Aug 12, 2022
Revised Total Coliform RuleHealth-based	Resolved	Jun 1, 2022 to Jun 30, 2022
Lead and Copper Rule	Resolved	Dec 30, 2021 to Oct 31, 2022
Consumer Confidence Rule	Resolved	Aug 10, 2021 to Oct 28, 2021

Twin Maples Nursing Home

CT0381011 · Groundwater · 100 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: Jul 1, 2025 to Dec 31, 2025

Violation history (1)

Imported violation history for Twin Maples Nursing Home
Rule	Status	Period
Lead and Copper Rule	Resolved	Apr 1, 2026 to May 21, 2026

Durham Elderly Housing Division

CT0380641 · Groundwater · 50 people served system-wide

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

1 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: 0 mg/L
Action level: 0.015 mg/L

0% of the listed benchmark

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

Violation history (2)

Imported violation history for Durham Elderly Housing Division
Rule	Status	Period
LEAD AND COPPER RULE REVISIONSHealth-based	Unaddressed	Oct 17, 2024
Public Notice	Resolved	Jun 16, 2024 to Jun 17, 2024

Durham Lexington Place Division

CT0380651 · Groundwater · 45 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, 2021 to Dec 31, 2023

Violation history (0)

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

Old Indian Trail

CT0820501 · Groundwater · 32 people served system-wide

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

1 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: 0 mg/L
Action level: 0.015 mg/L

0% of the listed benchmark

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

Violation history (11)

Imported violation history for Old Indian Trail
Rule	Status	Period
Consumer Confidence Rule	Unaddressed	Aug 10, 2025
Consumer Confidence Rule	Resolved	Jul 1, 2025 to Jul 29, 2025
Lead and Copper Rule	Resolved	Dec 30, 2024 to Jan 28, 2025
LEAD AND COPPER RULE REVISIONSHealth-based	Unaddressed	Oct 17, 2024
LEAD AND COPPER RULE REVISIONS	Unaddressed	Oct 17, 2024
Consumer Confidence Rule	Resolved	Aug 10, 2024 to Jul 29, 2025
Consumer Confidence Rule	Resolved	Jul 1, 2024 to Jul 29, 2025
Consumer Confidence Rule	Resolved	Aug 10, 2022 to Aug 7, 2023
Consumer Confidence Rule	Resolved	Jul 1, 2022 to Jul 28, 2023
Lead and Copper Rule	Resolved	Dec 30, 2021 to Mar 15, 2022
Consumer Confidence Rule	Resolved	Aug 10, 2021 to Jul 29, 2025

City summary

What the indexed records say

Durham has 1 published ZIP profile across Middlesex County. The regional-evidence median is 74 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.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs

Moderately hard1 ZIP

Hard0 ZIPs

Very hard0 ZIPs

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: 8.2 miles
Profiles with evidence: 1/1

Confidence labels

High: 1Moderate: 0Low: 0

Observation window: May 9, 2016 to Jun 1, 2026.

ZIP directory

Water reports in Durham

Open a ZIP for site-level provenance and measurements.

ZIP code

06422

Moderately Hard

74.2 PPM

Nearest site: 8.2 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

Clinton

Middlesex County

64 PPM median

Middletown

Middlesex County

64 PPM median

Portland

Middlesex County

58 PPM median

Norfolk

Litchfield County

72 PPM median

Colchester

New London County

71 PPM median

Bristol

Hartford County

69 PPM median

Search all 52 Connecticut cities →

Questions people ask

About water in Durham

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.