How does Johnstown's water compare to the national average?

The USA national average is 151 mg/L. Johnstown (≈ 120–179 mg/L) is 1 mg/L softer than average.

Johnstown Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

reservoir

pH Level

7.3

neutral = 7.0

Lead

0.007 mg/L

✓ Below action level

TDS

66 mg/L

Est. Daily Cost

$0.40

energy & soap waste

Source: See methodology section below · Updated 2026

hard~120–179 mg/LHard · est.

0–60

mg/L

Soft

61–120

mg/L

Moderately Hard

121–180

mg/L

Hard

180+

mg/L

Very Hard

Appliance Damage Report

In Johnstown, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In Johnstown	Soft Water City	Efficiency Loss
Kettle	6.8 yrs	8.5 yrs	-20%
Washing Machine	9.6 yrs	12 yrs	-20%
Water Heater	12 yrs	15 yrs	-20%

Regional Water Comparison

How Johnstown compares to its nearest neighbours

City	Hardness	Risk	Source
▶ Johnstown, Pennsylvania	≈ 120–179 mg/L	🟠 Hard	reservoir
Indiana, Pennsylvania	≈ 120–179 mg/L	🟠 Hard	reservoir
Altoona, Pennsylvania	≈ 120–179 mg/L	🟠 Hard	reservoir
Greensburg, Pennsylvania	≈ 180+ mg/L	🔴 Very Hard	reservoir
Cumberland, Maryland	≈ 120–179 mg/L	🟠 Hard	reservoir

National Benchmark

How Johnstown compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Johnstown	≈ 120–179 mg/L	🟠 Moderate
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

Bring Scarsdale-quality water to your Johnstown home

Shop water softeners on Amazon.com →

Shop Now

What Makes Johnstown's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 66 mg/LpH: 7.3

Greater Johnstown Water Authority (GJWA) serves Johnstown in Cambria County, Pennsylvania, supplying around 20,000 residents across ZIP codes like 15901–15909. Water sources include surface intakes from the Little Conemaugh River and Stonycreek River, treated at the Riverside Treatment Plant and Saltlick facilities. The authority manages two main utilities — Greater Johnstown WA Riverside and Greater Johnstown WA Saltlick — drawing from local rivers in the Conemaugh Valley without major reservoirs but with some groundwater blending.

The supply originates in the Conemaugh River watershed within the Allegheny Plateau, underlain by Paleozoic sedimentary rocks including Mississippian-age limestones and shales. Formations such as the Greenbrier Limestone impart a hard character through dissolution of alkaline earth metals. No primary aquifer dominates; fractured bedrock yields moderately mineralised water influenced by agricultural runoff and urban drainage, fostering natural hardness rather than the softness typical of glaciated or siliceous regions upstream.

Hard water leaves scale deposits on fixtures, reducing efficiency in water heaters, dishwashers, and washing machines by up to 20–30% over time. Faucet aerators and showerheads clog quickest, demanding monthly vinegar soaks or annual descaling. Laundry feels stiff without softeners and soaps lather poorly, increasing detergent use; a whole-house softener is recommended for households noticing buildup. Reports note 5 contaminants exceeding EPA health guidelines including bromodichloromethane (6.15 ppb), trichloroacetic acid, and dichloroacetic acids from disinfection byproducts; pH hovers around 7–8 and lead/copper levels comply post-2018 pipe replacements.

Geology & Source: Allegheny Front watershed — Mississippian/Devonian limestone and dolomite (Loyalhanna Limestone, Mauch Chunk Formation); karst topography dissolves calcium and magnesium into supply, producing hard water

Other Pennsylvania Water Reports

Indiana

≈ 120–179 mg/L

🟠 Hard

Altoona

≈ 120–179 mg/L

🟠 Hard

Greensburg

≈ 180+ mg/L

🔴 Very Hard

Cumberland

≈ 120–179 mg/L

🟠 Hard

Report an Issue

Notice an error or missing data? Help us keep this page accurate. If you spot incorrect water hardness, outdated utility info, or missing details, please let us know.

All reports are reviewed by our team. Thank you for supporting data quality!

Frequently Asked Questions

Is Johnstown's water safe to drink?

Yes. Johnstown's water meets all federal safety standards. The hardness is ≈ 120–179 mg/L (Hard), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Johnstown?

At ≈ 120–179 mg/L (Hard), Johnstown's water will cause significant limescale on kettles, washing machines, and water heaters. A water softener or descaler is strongly recommended to extend appliance lifespan and reduce energy bills by up to 20%.

How does Johnstown compare to the USA average?

The USA national average is 151 mg/L. Johnstown (≈ 120–179 mg/L) is 1 mg/L below the national average. The softest major city is Scarsdale at just 0.02 mg/L.

Data Sources & Methodology

Water quality data for Johnstown is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.

Estimated

Water Hardness

Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.

Estimated

Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.

Estimated

TDS — Total Dissolved Solids

Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.

Measured

PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances

EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.

Modelled

Lead

Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.

Calculated

Appliance Lifespan

Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.