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Water Hardness in 21795

Williamsport, Maryland · Washington County

11 PPM
0.6 GPG
Soft
0Soft60120180300+
High Confidence — USGS Monitoring

Dataset updated March 9, 2026Matched to 5 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology

Source context

How this ZIP reading is built

This ZIP reading is built from 5 matched water systems. When more than one system is matched, the displayed value is weighted toward larger known service populations when that data is available.

Source basis
4 USGS-backed sources
5 matched systems total for this ZIP; USGS monitoring is used where treated-water reports are unavailable.
Water source profile
Primarily surface water
Surface-water hardness can shift with reservoirs, runoff, season, and treatment. This profile is weighted by known population served across matched systems.
Data recency
March 9, 2026
Dataset rebuilt March 9, 2026; individual utility reporting years can vary.

Hardness is a mineral-content reading, not a drinking-water safety rating. Use it for scale, appliance, and softener decisions; check your utility report or test your tap before sizing treatment equipment. See how we calculate local readings.

Water Systems Serving 21795

These are the systems matched to this ZIP code. The displayed ZIP value is weighted toward larger known service populations when population data is available.

5 water systems
PWSID is the public water system identifier. Data Source shows whether the hardness value comes from a treated-water report, USGS monitoring, or a local estimate; source year is shown when available.
City Of Hagerstown
MD0210010
Soft
11 PPMsurface water92,200 servedEstimated — Nearby Data
Town Of Williamsport Distribution System
MD0210021
Soft
11 PPMsurface water2,400 servedHigh Confidence — USGS Monitoring
Town Of Sharpsburg
MD0210017
Soft
11 PPMsurface water1,360 servedHigh Confidence — USGS Monitoring
Town Of Clear Spring
MD0210005
Soft
11 PPMsurface water455 servedHigh Confidence — USGS Monitoring
Cedar Ridge Children'S Home & School
MD0210020
Soft
11 PPMsurface water45 servedHigh Confidence — USGS Monitoring

Nearby Zip Codes

254191742173311217401421734112172211217131121767112178212254431922175611217421125401174

What This Means For You

Recommendations are based on the displayed ZIP hardness reading. Confirm your tap reading before sizing or buying treatment equipment.

Your Water Is Soft

Your water hardness is in the soft range. You likely don't need a water softener. Enjoy your naturally soft water!

Know your water hardness?

If you've tested your water or have your utility's CCR report, share your reading to help us improve accuracy for Williamsport, MD (21795).

Submit Your Data

Frequently Asked Questions

Is the water hard in Williamsport, MD (21795)?

The average water hardness in 21795 is 11 PPM (0.6 GPG), which is classified as soft.

Do I need a water softener in 21795?

At 11 PPM, your water is relatively soft. A water softener is generally not necessary.

Is hard water in 21795 safe to drink?

Water hardness itself is a mineral-content reading, not a drinking-water safety rating. Calcium and magnesium are naturally occurring minerals, but you should check your utility's Consumer Confidence Report for contaminant and compliance information.

How many water systems serve 21795?

Zip code 21795 in Williamsport, Maryland is served by 5 water systems.

Learn More About Your Water

Water Hardness Scale: PPM and GPG Chart

Use the USGS water hardness scale to compare PPM, GPG, and mg/L levels from soft to very hard water.

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How to Test Water Hardness at Home

Compare free lookups, soap tests, test strips, liquid drop kits, and lab tests for measuring water hardness.

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