How hard is the water in Mechanicsburg, PA?

Tap water hardness
120mg/L
7.0gpg
Moderately hard

Reported by PA American Water CO West · May 2025

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

Mechanicsburg water measures 120 mg/L (7.0 gpg) of hardness, moderately hard by USGS standards. The number comes from PA American Water CO West, dated May 2025.

Mechanicsburg on the hardness scale, with nearby cities
060120180240300360+PA typical 127Progress: 30 mg/LProgress 30Harrisburg: 40 mg/LHarrisburg 40Middletown: 57 mg/LMiddletown 57Shiloh: 83 mg/LShiloh 83Camp Hill: 128 mg/LCamp Hill 128Lower Allen: 128 mg/LLower Allen 128Enola: 128 mg/LEnola 128New Cumberland: 128 mg/LNew Cumberland 128Carlisle: 176 mg/LCarlisle 176Elizabethtown: 255 mg/LElizabethtown 255Mechanicsburg 120mg/L as calcium carbonate060120180240300360+PA 127Progress: 30 mg/LProgress 30Harrisburg: 40 mg/LHarrisburg 40Camp Hill: 128 mg/LCamp Hill 128Lower Allen: 128 mg/LLower Allen 128Enola: 128 mg/LEnola 128New Cumberland: 128 mg/LNew Cumber. 128120 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 120 mg/L, Mechanicsburg is close to the typical Pennsylvania figure of 127 mg/L. Of the 10 nearest cities we track, 4 have softer water and 6 have harder. The range nearby runs from 30 mg/L in Progress to 255 in Elizabethtown.

What 120 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 Mechanicsburg

3 people × 75 gallons a day × 7.0 gpg = 1,577 grains a day. A 24,000-grain unit regenerates about every 15 days.

Size it for your household

EPA record for Mechanicsburg's water system

PA American Water CO West · PWSID PA7210029

No health-based violations since 2016

Serves about 105,127 people from surface water.

Health-based
0
Monitoring or reporting
5
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 Mechanicsburg water hard?

Somewhat. It measures about 120 mg/L (7.0 grains per gallon), which the USGS classes as moderately hard.

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

About 7.0 gpg. One grain per gallon equals 17.1 mg/L, so 120 mg/L divided by 17.1 gives 7.0.

What size water softener do I need in Mechanicsburg?

For 3 people using 75 gallons each per day, 7.0 gpg works out to about 1,577 grains a day. A 24,000-grain softener covers that with a regeneration about every 15 days.

Has the Mechanicsburg water system had EPA violations?

EPA records show no health-based violations for PA American Water CO West since 2016. There were also 5 monitoring or reporting violations, which are about late or missing tests and notices.

Nearby cities

All 172 cities in Pennsylvania

Hardness data: TapWaterData US Water Hardness (utility report, May 28, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.