How hard is the water in Monroeville, PA?

Tap water hardness
96mg/L
5.6gpg
Moderately hardCounty estimate

County estimate from 2,228 water samples in Allegheny County · July 2026

PA typical
127 mg/L
Softener for 3 people
24k grain
Data
County estimate

Water samples from around Monroeville put hardness at about 96 mg/L (5.6 gpg), which would be moderately hard on the USGS scale. Treat this as a rough guide: it is the median of 2,228 samples taken across Allegheny County, mostly wells and streams, not a test of Monroeville's treated tap water.

Monroeville on the hardness scale, with nearby cities
060120180240300360+PA typical 127Plum: 66 mg/LPlum 66Forest Hills: 90 mg/LForest Hills 90Wilkinsburg: 90 mg/LWilkinsburg 90Swissvale: 90 mg/LSwissvale 90Oakmont: 90 mg/LOakmont 90Duquesne: 102 mg/LDuquesne 102Munhall: 102 mg/LMunhall 102West Mifflin: 102 mg/LWest Mifflin 102Fox Chapel: 102 mg/LFox Chapel 102Baldwin: 102 mg/LBaldwin 102Monroeville 96mg/L as calcium carbonate060120180240300360+PA 127Plum: 66 mg/LPlum 66Forest Hills: 90 mg/LForest Hil. 90Wilkinsburg: 90 mg/LWilkinsburg 90Swissvale: 90 mg/LSwissvale 90Oakmont: 90 mg/LOakmont 90Duquesne: 102 mg/LDuquesne 10296 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Monroeville sits 31 mg/L below the typical Pennsylvania figure of 127. Of the 10 nearest cities we track, 5 have softer water and 5 have harder. The range nearby runs from 66 mg/L in Plum to 102 in Duquesne.

What 96 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 Monroeville

3 people × 75 gallons a day × 5.6 gpg = 1,262 grains a day. A 24,000-grain unit regenerates about every 19 days.

Size it for your household

EPA record for Monroeville's water system

We could not match Monroeville to a community water system in EPA's records. Your water bill or the yearly Consumer Confidence Report names the system and its ID.

Questions

Is Monroeville water hard?

Somewhat. It measures about 96 mg/L (5.6 grains per gallon), which the USGS classes as moderately hard.

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

About 5.6 gpg. One grain per gallon equals 17.1 mg/L, so 96 mg/L divided by 17.1 gives 5.6.

What size water softener do I need in Monroeville?

For 3 people using 75 gallons each per day, 5.6 gpg works out to about 1,262 grains a day. A 24,000-grain softener covers that with a regeneration about every 19 days.

Nearby cities

All 172 cities in Pennsylvania

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.