King of Prussia Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

groundwater

pH Level

8.3

neutral = 7.0

Lead

0.001 mg/L

✓ Below action level

TDS

489 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 King of Prussia, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In King of Prussia	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 King of Prussia compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ King of Prussia, Pennsylvania	≈ 120–179 mg/L	4.5 ppt	🟠 Hard	groundwater
West Norriton, Pennsylvania	288 mg/L	10 ppt	🔴 Very Hard	reservoir
Wayne, Pennsylvania	70 mg/L	0 ppt	🟡 Moderately Hard	reservoir
Radnor, Pennsylvania	≈ 120–179 mg/L	7.2 ppt	🟠 Hard	reservoir
Norristown, Pennsylvania	≈ 180+ mg/L	46.3 ppt	🔴 Very Hard	reservoir

National Benchmark

How King of Prussia compares to the USA average

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

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What Makes King of Prussia's Water Unique?

Local geology and source profile

Source: GroundwaterTDS: 489 mg/LpH: 8.3

Aqua Pennsylvania - Pennsylvania American Water serves King of Prussia in Montgomery County from seven surface water sources including the Valley Forge Dam on Valley Creek, Perkiomen Creek, and the Norristown Dam on the Schuylkill River, supplemented by multiple groundwater wells. Treatment occurs at facilities including the Valley Forge Treatment Plant and Norristown Plant, processing raw water through coagulation, sedimentation, filtration, and disinfection for distribution across Upper Merion Township and surrounding areas. Source water assessments from 2002 indicate moderate contamination risk from upstream development and agricultural runoff in the watershed.

The supply originates in the Schuylkill River Watershed, spanning the Piedmont physiographic province where water contacts Paleozoic carbonate rock formations including the Chickies Quartzite and Ledger Dolomite within the South Mountain Province. Groundwater components access the confined Cambrian-Ordovician aquifer system, including the Conestoga Limestone, shaping chemistry through mineral dissolution. This geology yields a moderately mineralised supply, with limestone and dolomite contributing calcium and magnesium — moderated by surface water dilution and treatment — characteristic of the region's karst-influenced hydrology prone to variable ion loading from fractured bedrock.

Moderate hardness from the karst geology promotes scale buildup in water heaters, dishwashers, and plumbing fixtures over time, reducing efficiency and lifespan. Soap lathering is reduced and detergent use increases. Regular descaling of faucet aerators and annual flushing of water heaters is recommended; a water softener or scale inhibitor is advisable for households noticing spotting on glassware or dry skin. Annual Consumer Confidence Reports are available from Pennsylvania American Water at amwater.com/paaw and from Aqua Pennsylvania at aquawater.com.

Geology & Source: Schuylkill River basin — Cambrian-Ordovician carbonate aquifers (Beekmantown Group, Ledger Dolomite, Conestoga Limestone); limestone karst terrain and fractured dolomitic bedrock dissolve calcium and magnesium, imparting moderate hardness

Other Pennsylvania Water Reports

West Norriton

288 mg/L

🔴 Very Hard

Wayne

70 mg/L

🟡 Moderately Hard

Radnor

≈ 120–179 mg/L

🟠 Hard

Norristown

≈ 180+ mg/L

🔴 Very Hard

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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 King of Prussia's water safe to drink?

Yes. King of Prussia'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 King of Prussia?

At ≈ 120–179 mg/L (Hard), King of Prussia'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 King of Prussia compare to the USA average?

The USA national average is 151 mg/L. King of Prussia (≈ 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 King of Prussia 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.