Hard water in Philadelphia, PA

Tap water hardness
127mg/L
7.4gpg
Hard

Reported by Philadelphia Water Department · October 2025

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

The water in Philadelphia carries roughly 127 mg/L of dissolved calcium and magnesium, or 7.4 grains per gallon. That is hard water. The number comes from Philadelphia Water Department, dated October 2025.

Philadelphia on the hardness scale, with nearby cities
060120180240300360+PA typical 127Elkins Park: 153 mg/LElkins Park 153Bala Cynwyd: 153 mg/LBala Cynwyd 153Wyndmoor: 153 mg/LWyndmoor 153Merion Station: 153 mg/LMerion Station 153Glenside: 153 mg/LGlenside 153Penn Wynne: 153 mg/LPenn Wynne 153Oreland: 153 mg/LOreland 153Yeadon: 153 mg/LYeadon 153Roslyn: 153 mg/LRoslyn 153Ardmore: 153 mg/LArdmore 153Philadelphia 127mg/L as calcium carbonate060120180240300360+PA 127Elkins Park: 153 mg/LElkins Park 153Bala Cynwyd: 153 mg/LBala Cynwyd 153Wyndmoor: 153 mg/LWyndmoor 153Merion Station: 153 mg/LMerion Sta. 153Glenside: 153 mg/LGlenside 153Penn Wynne: 153 mg/LPenn Wynne 153127 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 127 mg/L, Philadelphia is close to the typical Pennsylvania figure of 127 mg/L. None of the 10 nearest cities we track has softer water.

What 127 mg/L means at home

Expect white crust on faucets and showerheads, plus spots on dishes that come out of the dishwasher.

Kettles collect scale quickly. Water heaters build up sediment at the bottom of the tank, which makes them work harder over time.

Soap and detergent need a little more to lather, and soap scum shows up in the tub.

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

At 127 mg/L most of the trouble is scale, and only a few things deal with it.

Ion-exchange water softener

The standard whole-house fix. It swaps calcium and magnesium for sodium or potassium and needs salt plus a drain. Size it with the calculator below.

Salt-free conditioner

No salt and no drain line. It changes how minerals form scale instead of removing them, so water still tests hard.

Reverse osmosis or carbon filter

Under-sink reverse osmosis removes minerals from drinking water only. Plain carbon filters improve taste but do not soften.

Softener size for Philadelphia

3 people × 75 gallons a day × 7.4 gpg = 1,672 grains a day. A 24,000-grain unit regenerates about every 14 days.

Size it for your household

EPA record for Philadelphia's water system

Philadelphia Water Department · PWSID PA1510001

No health-based violations since 2016

Serves about 1,600,000 people from surface water.

Health-based
0
Monitoring or reporting
8
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 Philadelphia water hard?

Yes. It measures about 127 mg/L (7.4 grains per gallon), which the USGS classes as hard.

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

About 7.4 gpg. One grain per gallon equals 17.1 mg/L, so 127 mg/L divided by 17.1 gives 7.4.

What size water softener do I need in Philadelphia?

For 3 people using 75 gallons each per day, 7.4 gpg works out to about 1,672 grains a day. A 24,000-grain softener covers that with a regeneration about every 14 days.

Has the Philadelphia water system had EPA violations?

EPA records show no health-based violations for Philadelphia Water Department since 2016. There were also 8 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, October 9, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.