How hard is the water in Waterbury, CT?

Tap water hardness
66mg/L
3.9gpg
Moderately hard

Reported by CTWC - Naugatuck Region-Central System · August 2025

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

The water in Waterbury carries roughly 66 mg/L of dissolved calcium and magnesium, or 3.9 grains per gallon. That is moderately hard water. The number comes from CTWC - Naugatuck Region-Central System, dated August 2025.

Waterbury on the hardness scale, with nearby cities
060120180240300360+CT typical 53Cheshire Village: 46 mg/LCheshire Village 46Ansonia: 46 mg/LAnsonia 46North Haven: 46 mg/LNorth Haven 46Northford: 46 mg/LNorthford 46New Haven: 46 mg/LNew Haven 46Derby: 49 mg/LDerby 49Sandy Hook: 53 mg/LSandy Hook 53Naugatuck: 66 mg/LNaugatuck 66Bristol: 162 mg/LBristol 162New Britain: 162 mg/LNew Britain 162Waterbury 66mg/L as calcium carbonate060120180240300360+CT 53Cheshire Village: 46 mg/LCheshire V. 46Ansonia: 46 mg/LAnsonia 46Sandy Hook: 53 mg/LSandy Hook 53Naugatuck: 66 mg/LNaugatuck 66Bristol: 162 mg/LBristol 162New Britain: 162 mg/LNew Britain 16266 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

At 66 mg/L, Waterbury is 13 mg/L above the typical Connecticut figure of 53. Of the 10 nearest cities we track, 7 have softer water and 2 have harder. The range nearby runs from 46 mg/L in Cheshire Village to 162 in Bristol.

What 66 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 Waterbury

3 people × 75 gallons a day × 3.9 gpg = 868 grains a day. A 24,000-grain unit regenerates about every 27 days.

Size it for your household

EPA record for Waterbury's water system

CTWC - Naugatuck Region-Central System · PWSID CT0880011

No health-based violations since 2016

Serves about 22,735 people from surface water.

Health-based
0
Monitoring or reporting
0
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 Waterbury water hard?

Somewhat. It measures about 66 mg/L (3.9 grains per gallon), which the USGS classes as moderately hard.

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

About 3.9 gpg. One grain per gallon equals 17.1 mg/L, so 66 mg/L divided by 17.1 gives 3.9.

What size water softener do I need in Waterbury?

For 3 people using 75 gallons each per day, 3.9 gpg works out to about 868 grains a day. A 24,000-grain softener covers that with a regeneration about every 27 days.

Has the Waterbury water system had EPA violations?

EPA records show no health-based violations for CTWC - Naugatuck Region-Central System since 2016.

Nearby cities

All 51 cities in Connecticut

Hardness data: TapWaterData US Water Hardness (utility report, August 21, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.