How hard is the water in Thompsonville, CT?

Tap water hardness
61mg/L
3.6gpg
Moderately hard

Reported by CTWC - Northern Reg-Western System · August 2025

CT typical
53 mg/L
EPA health violations since 2016
0
Softener for 3 people
24k grain
Data
Utility report

Tap water in Thompsonville has about 61 mg/L of hardness, which is 3.6 grains per gallon. On the USGS scale that counts as moderately hard. The number comes from CTWC - Northern Reg-Western System, dated August 2025.

Thompsonville on the hardness scale, with nearby cities
060120180240300360+CT typical 53East Hartford: 16 mg/LEast Hartford 16Hartford: 16 mg/LHartford 16West Hartford: 16 mg/LWest Hartford 16Glastonbury Center: 16 mg/LGlastonbury Center 16Wethersfield: 16 mg/LWethersfield 16Sherwood Manor: 61 mg/LSherwood Manor 61Windsor Locks: 61 mg/LWindsor Locks 61Rockville: 61 mg/LRockville 61Storrs: 97 mg/LStorrs 97Manchester: 131 mg/LManchester 131Thompsonville 61mg/L as calcium carbonate060120180240300360+CT 53East Hartford: 16 mg/LEast Hartf. 16Hartford: 16 mg/LHartford 16Sherwood Manor: 61 mg/LSherwood M. 61Windsor Locks: 61 mg/LWindsor Lo. 61Rockville: 61 mg/LRockville 61Manchester: 131 mg/LManchester 13161 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Thompsonville sits close to the typical Connecticut figure of 53 mg/L. Of the 10 nearest cities we track, 5 have softer water and 2 have harder. The range nearby runs from 16 mg/L in East Hartford to 131 in Manchester.

What 61 mg/L means at home

You may see faint white spots on glasses and shower doors after the water dries.

Scale builds up slowly. A kettle or coffee maker needs descaling now and then, maybe every few months.

Hardness is not a health problem, and EPA sets no limit for it. It is a matter of scale and soap.

What to do about it

Optional. Plenty of households at this level live with it and descale the kettle now and then.

Water softener

Worth a look if spots on glass bother you, or if your tankless water heater manual asks for softer water.

Carbon filter

Improves taste and removes chlorine. It leaves calcium and magnesium in place.

Softener size for Thompsonville

3 people × 75 gallons a day × 3.6 gpg = 806 grains a day. A 24,000-grain unit regenerates about every 29 days.

Size it for your household

EPA record for Thompsonville's water system

CTWC - Northern Reg-Western System · PWSID CT0473011

No health-based violations since 2016

Serves about 101,313 people from surface water.

Health-based
0
Monitoring or reporting
2
Open now
1

TapWaterData ties Thompsonville to this system. EPA's service-area records do not name Thompsonville, so check the utility printed on your water bill.

Health-based means a contaminant above its legal limit or a missed treatment step. Monitoring and reporting violations are late or missing tests and notices. Source: EPA ECHO, 2026Q3 export, violations with periods starting 2016 or later. Full EPA record.

Questions

Is Thompsonville water hard?

Somewhat. It measures about 61 mg/L (3.6 grains per gallon), which the USGS classes as moderately hard.

What is the water hardness in Thompsonville in grains per gallon?

About 3.6 gpg. One grain per gallon equals 17.1 mg/L, so 61 mg/L divided by 17.1 gives 3.6.

What size water softener do I need in Thompsonville?

For 3 people using 75 gallons each per day, 3.6 gpg works out to about 806 grains a day. A 24,000-grain softener covers that with a regeneration about every 29 days.

Has the Thompsonville water system had EPA violations?

EPA records show no health-based violations for CTWC - Northern Reg-Western System since 2016. There were also 2 monitoring or reporting violations, which are about late or missing tests and notices.

Nearby cities

All 51 cities in Connecticut

Hardness data: TapWaterData US Water Hardness (utility report, August 2, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.