How hard is the water in Willow Street, PA?

Tap water hardness
120mg/L
7.0gpg
Moderately hard

Reported by City of Lancaster · September 2025

PA typical
127 mg/L
EPA health violations since 2016
2
Softener for 3 people
24k grain
Data
Utility report

Willow Street water measures 120 mg/L (7.0 gpg) of hardness, moderately hard by USGS standards. The number comes from City of Lancaster, dated September 2025.

Willow Street on the hardness scale, with nearby cities
060120180240300360+PA typical 127Middletown: 57 mg/LMiddletown 57East York: 83 mg/LEast York 83York: 83 mg/LYork 83West York: 83 mg/LWest York 83Shiloh: 83 mg/LShiloh 83Mount Joy: 93 mg/LMount Joy 93Lancaster: 120 mg/LLancaster 120Millersville: 120 mg/LMillersville 120Elizabethtown: 255 mg/LElizabethtown 255Lebanon: 266 mg/LLebanon 266Willow Street 120mg/L as calcium carbonate060120180240300360+PA 127East York: 83 mg/LEast York 83York: 83 mg/LYork 83Mount Joy: 93 mg/LMount Joy 93Lancaster: 120 mg/LLancaster 120Millersville: 120 mg/LMillersvil. 120Elizabethtown: 255 mg/LElizabetht. 255120 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, Willow Street is close to the typical Pennsylvania figure of 127 mg/L. Of the 10 nearest cities we track, 6 have softer water and 2 have harder. The range nearby runs from 57 mg/L in Middletown to 266 in Lebanon.

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 Willow Street

3 people × 75 gallons a day × 7.0 gpg = 1,580 grains a day. A 24,000-grain unit regenerates about every 15 days.

Size it for your household

EPA record for Willow Street's water system

City of Lancaster · PWSID PA7360058

2 health-based violations since 2016

Serves about 120,000 people from surface water.

Health-based
2
Monitoring or reporting
2
Open now
0

TapWaterData ties Willow Street to this system. EPA's service-area records do not name Willow Street, so check the utility printed on your water bill.

20162017201820192020202120222023202420252026Total trihalomethanes (TTHM)Haloacetic acids (HAA5)'16'18'20'22'24'26Total trihalomethanes (TTHM)Haloacetic acids (HAA5)
Each dot is one health-based violation, placed at the start of its compliance period.
Contaminant or ruleViolationsPeriodStatus
Total trihalomethanes (TTHM)a disinfection byproduct12024Resolved
Haloacetic acids (HAA5)a disinfection byproduct12016Resolved

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 Willow Street 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 Willow Street 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 Willow Street?

For 3 people using 75 gallons each per day, 7.0 gpg works out to about 1,580 grains a day. A 24,000-grain softener covers that with a regeneration about every 15 days.

Has the Willow Street water system had EPA violations?

EPA records show 2 health-based violations for City of Lancaster since 2016, involving Total trihalomethanes (TTHM), Haloacetic acids (HAA5). There were also 2 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, September 16, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.