Utility-reported hardness
Unavailable
Ask your provider or test your tap
Local water dashboard
Official source aggregationWater quality in Durham, CT 06422
Regional hardness evidence, possible serving systems, EPA compliance history, and the measurements that are—and are not—available for Middlesex County.
4 active health-based record(s) across possible systems
- Largest possible serving system
- Durham Center Division
- Source water
- Surface water + Groundwater
- County
- Middlesex 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
Review needed
4 active health-based records
Measurements by utility
Each result belongs to a specific system.
Utility match
7 systems
Serves 1,601 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.
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
- 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)
| 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
- 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)
| 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
- 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)
| 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
- 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)
| 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
- 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)
| 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
- 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
- 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)
| 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 |
Hardness meter
What does nearby environmental evidence show?
74.2
PPM as CaCO₃
Moderately Hard
PPM
74.2
GPG
4.3
Regional environmental evidence
USGS hardness classification scale
74.2 PPM
Soft
0–60Moderate
61–120Hard
121–180Very hard
181+
0–60Moderate
61–120Hard
121–180Very hard
181+
Parts per million
74.2
mg/L as CaCO₃ equivalent
Grains per gallon
4.3
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
13
Nearest site
8.2 mi
Observation range
May 9, 2016–Jun 1, 2026
Regional evidence confidence
High
Median of the latest source-type-aligned hardness observation at each monitoring site within 25 miles. Nearest monitoring location: QUINNIPIAC RIVER AT WALLINGFORD, 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 06422 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Durham median
74 PPM
About the same1 indexed ZIP readings · Range 74.2–74.2 PPM
Connecticut median
89 PPM
15 PPM lower98 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
An active health-based record is present. Follow the utility's current notice and public-health instructions.
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 →Frequently asked
Water questions for Durham
Is tap water safe in Durham?+
EPA ECHO reports 4 active health-based violations among the associated community water systems. Review the affected utility's current notice and Consumer Confidence Report.
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.