Hard water in Bristol, CT

Tap water hardness
162mg/L
9.5gpg
Hard

Reported by Aquarion Water CO of CT - Plainville · September 2025

CT typical
53 mg/L
EPA health violations since 2016
1
Softener for 3 people
24k grain
Data
Utility report

Bristol water measures 162 mg/L (9.5 gpg) of hardness, hard by USGS standards. The number comes from Aquarion Water CO of CT - Plainville, dated September 2025.

Bristol on the hardness scale, with nearby cities
060120180240300360+CT typical 53Torrington: 9 mg/LTorrington 9Newington: 16 mg/LNewington 16West Hartford: 16 mg/LWest Hartford 16Wethersfield: 16 mg/LWethersfield 16Hartford: 16 mg/LHartford 16Cheshire Village: 46 mg/LCheshire Village 46Middletown: 64 mg/LMiddletown 64Waterbury: 66 mg/LWaterbury 66Naugatuck: 66 mg/LNaugatuck 66New Britain: 162 mg/LNew Britain 162Bristol 162mg/L as calcium carbonate060120180240300360+CT 53Newington: 16 mg/LNewington 16West Hartford: 16 mg/LWest Hartf. 16Wethersfield: 16 mg/LWethersfie. 16Cheshire Village: 46 mg/LCheshire V. 46Waterbury: 66 mg/LWaterbury 66New Britain: 162 mg/LNew Britain 162162 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Bristol sits 109 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 9 mg/L in Torrington to 162 in New Britain.

What 162 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 162 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 Bristol

3 people × 75 gallons a day × 9.5 gpg = 2,131 grains a day. A 24,000-grain unit regenerates about every 11 days.

Size it for your household

EPA record for Bristol's water system

Aquarion-Plainville Regional · PWSID CT1100011

1 health-based violation since 2016

Serves about 18,231 people from groundwater.

Health-based
1
Monitoring or reporting
10
Open now
0
20162017201820192020202120222023202420252026Groundwater Rule'16'18'20'22'24'26Groundwater Rule
Each dot is one health-based violation, placed at the start of its compliance period.
Contaminant or ruleViolationsPeriodStatus
Groundwater Ruletreatment of well water12026Resolved

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 Bristol water hard?

Yes. It measures about 162 mg/L (9.5 grains per gallon), which the USGS classes as hard.

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

About 9.5 gpg. One grain per gallon equals 17.1 mg/L, so 162 mg/L divided by 17.1 gives 9.5.

What size water softener do I need in Bristol?

For 3 people using 75 gallons each per day, 9.5 gpg works out to about 2,131 grains a day. A 24,000-grain softener covers that with a regeneration about every 11 days.

Has the Bristol water system had EPA violations?

EPA records show 1 health-based violation for Aquarion-Plainville Regional since 2016, involving Groundwater Rule. There were also 10 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, September 2, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.