Woonsocket, RI water hardness

Tap water hardness
23mg/L
1.3gpg
SoftCounty estimate

County estimate from 1,493 water samples in Providence County · July 2026

RI typical
42 mg/L
EPA health violations since 2016
1
Data
County estimate

Water samples from around Woonsocket put hardness at about 23 mg/L (1.3 gpg), which would be soft on the USGS scale. Treat this as a rough guide: it is the median of 1,493 samples taken across Providence County, mostly wells and streams, not a test of Woonsocket's treated tap water. One more reason for caution: EPA lists Woonsocket's water system as using surface water, which is often softer than the wells behind the county figure.

Woonsocket on the hardness scale, with nearby cities
060120180240300360+RI typical 42Tiverton: 7 mg/LTiverton 7Central Falls: 23 mg/LCentral Falls 23Cranston: 23 mg/LCranston 23Providence: 42 mg/LProvidence 42Warwick: 42 mg/LWarwick 42Newport East: 42 mg/LNewport East 42Newport: 42 mg/LNewport 42Kingston: 44 mg/LKingston 44Wakefield-Peace Dale: 44 mg/LWakefield-Peace Dale 44East Providence: 50 mg/LEast Providence 50Woonsocket 23mg/L as calcium carbonate060120180240300360+RI 42Tiverton: 7 mg/LTiverton 7Central Falls: 23 mg/LCentral Fa. 23Cranston: 23 mg/LCranston 23Providence: 42 mg/LProvidence 42Warwick: 42 mg/LWarwick 42East Providence: 50 mg/LEast Provi. 5023 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Woonsocket sits 19 mg/L below the typical Rhode Island figure of 42. Of the 10 nearest cities we track, 1 has softer water and 7 have harder. The range nearby runs from 7 mg/L in Tiverton to 50 in East Providence.

What 23 mg/L means at home

Soap and shampoo lather with very little product. Kettles and showerheads stay mostly free of white crust.

Some people notice that soap feels slow to rinse off in soft water. That slippery feel is normal and harmless.

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

Nothing, as far as hardness goes. At 23 mg/L a softener would have almost nothing to remove.

Carbon filter

If the water tastes of chlorine, a pitcher or faucet carbon filter takes care of that. It does not change hardness.

EPA record for Woonsocket's water system

Woonsocket Water Division · PWSID RI1559518

1 health-based violation since 2016

Serves about 45,828 people from surface water.

Health-based
1
Monitoring or reporting
20
Open now
0

EPA lists this system as serving Woonsocket.

20162017201820192020202120222023202420252026Surface Water Treatment Rule'16'18'20'22'24'26Surface Water Treatment Rule
Each dot is one health-based violation, placed at the start of its compliance period.
Contaminant or ruleViolationsPeriodStatus
Surface Water Treatment Rulefiltration and disinfection12019Resolved

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 Woonsocket water hard?

No. It measures about 23 mg/L (1.3 grains per gallon), which the USGS classes as soft.

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

About 1.3 gpg. One grain per gallon equals 17.1 mg/L, so 23 mg/L divided by 17.1 gives 1.3.

Has the Woonsocket water system had EPA violations?

EPA records show 1 health-based violation for Woonsocket Water Division since 2016, involving Surface Water Treatment Rule. There were also 20 monitoring or reporting violations, which are about late or missing tests and notices.

Nearby cities

All 12 cities in Rhode Island

Hardness data: TapWaterData US Water Hardness (county estimate, July 4, 2026), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.