Hard water in Manchester, CT

Tap water hardness
131mg/L
7.7gpg
Hard

Reported by Manchester Water Department · October 2025

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

Tap water in Manchester has about 131 mg/L of hardness, which is 7.7 grains per gallon. On the USGS scale that counts as hard. The number comes from Manchester Water Department, dated October 2025.

Manchester on the hardness scale, with nearby cities
060120180240300360+CT typical 53East Hartford: 16 mg/LEast Hartford 16Glastonbury Center: 16 mg/LGlastonbury Center 16Hartford: 16 mg/LHartford 16Wethersfield: 16 mg/LWethersfield 16West Hartford: 16 mg/LWest Hartford 16Newington: 16 mg/LNewington 16Rockville: 61 mg/LRockville 61Windsor Locks: 61 mg/LWindsor Locks 61Thompsonville: 61 mg/LThompsonville 61Storrs: 97 mg/LStorrs 97Manchester 131mg/L as calcium carbonate060120180240300360+CT 53East Hartford: 16 mg/LEast Hartf. 16Glastonbury Center: 16 mg/LGlastonbur. 16Hartford: 16 mg/LHartford 16Wethersfield: 16 mg/LWethersfie. 16West Hartford: 16 mg/LWest Hartf. 16Rockville: 61 mg/LRockville 61131 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Manchester sits 78 mg/L above the typical Connecticut figure of 53. None of the 10 nearest cities we track has harder water. The range nearby runs from 16 mg/L in East Hartford to 97 in Storrs.

What 131 mg/L means at home

Expect white crust on faucets and showerheads, plus spots on dishes that come out of the dishwasher.

Kettles collect scale quickly. Water heaters build up sediment at the bottom of the tank, which makes them work harder over time.

Soap and detergent need a little more to lather, and soap scum shows up in the tub.

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

At 131 mg/L most of the trouble is scale, and only a few things deal with it.

Ion-exchange water softener

The standard whole-house fix. It swaps calcium and magnesium for sodium or potassium and needs salt plus a drain. Size it with the calculator below.

Salt-free conditioner

No salt and no drain line. It changes how minerals form scale instead of removing them, so water still tests hard.

Reverse osmosis or carbon filter

Under-sink reverse osmosis removes minerals from drinking water only. Plain carbon filters improve taste but do not soften.

Softener size for Manchester

3 people × 75 gallons a day × 7.7 gpg = 1,724 grains a day. A 24,000-grain unit regenerates about every 13 days.

Size it for your household

EPA record for Manchester's water system

Manchester Water Department · PWSID CT0770021

No health-based violations since 2016

Serves about 51,198 people from surface water.

Health-based
0
Monitoring or reporting
4
Open now
0

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 Manchester water hard?

Yes. It measures about 131 mg/L (7.7 grains per gallon), which the USGS classes as hard.

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

About 7.7 gpg. One grain per gallon equals 17.1 mg/L, so 131 mg/L divided by 17.1 gives 7.7.

What size water softener do I need in Manchester?

For 3 people using 75 gallons each per day, 7.7 gpg works out to about 1,724 grains a day. A 24,000-grain softener covers that with a regeneration about every 13 days.

Has the Manchester water system had EPA violations?

EPA records show no health-based violations for Manchester Water Department since 2016. There were also 4 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, October 7, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.