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

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

Allentown Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

reservoir

pH Level

neutral = 7.0

Lead

0.002 mg/L

✓ Below action level

TDS

268 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 Allentown, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In Allentown	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 Allentown compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Allentown, Pennsylvania	≈ 120–179 mg/L	57.4 ppt	🟠 Hard	reservoir
Fullerton, Pennsylvania	≈ 180+ mg/L	10.7 ppt	🔴 Very Hard	reservoir
Whitehall Township, Pennsylvania	≈ 120–179 mg/L	125.6 ppt	🟠 Hard	groundwater
Emmaus, Pennsylvania	≈ 120–179 mg/L	1022.2 ppt	🟠 Hard	groundwater
Bethlehem, Pennsylvania	17.12 mg/L	0 ppt	🟢 Soft	reservoir

National Benchmark

How Allentown compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Allentown	≈ 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 Allentown's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 268 mg/LpH: 8

The Lehigh County Authority (LCA) supplies drinking water to Allentown and surrounding municipalities in Lehigh County, Pennsylvania, serving approximately 125,000 residents. Sources include surface water from the Little Lehigh Creek and groundwater from Schantz Spring plus 19 wells across the watershed. LCA operates treatment facilities processing this mixed supply through coagulation, filtration, disinfection with chlorine, and fluoridation before distribution.

The Little Lehigh Creek watershed drains a portion of the Lehigh Valley, underlain by Paleozoic limestone and dolomite formations from the Devonian period, such as those in the Hamilton Group. Groundwater sources tap fractured carbonate aquifers in this karst terrain, where geological dissolution imparts a hard character through elevated calcium and magnesium content. Surface flows pick up similar mineral signatures from limestone outcrops, shaping an overall hard profile typical of the Appalachian Piedmont transition zone.

Hard water in Allentown causes scale buildup on fixtures, kettles, and inside pipes, reducing water heater efficiency by up to 20–30% and causing spotty dishes or dry skin. Most affected are water heaters, dishwashers, washing machines, and faucets. Regular vinegar descaling, low-flow aerators, and magnetic descalers help mitigate effects; a water softener is widely recommended to extend appliance life and improve soap efficiency. The system complies with EPA lead and copper rules via corrosion control; older homes may benefit from filtration, and pH is maintained around neutral for distribution stability.

Geology & Source: Little Lehigh Creek watershed and Schantz Spring — Paleozoic Devonian and Carboniferous limestone and dolomite in Lehigh Valley karst; fractured carbonate aquifers dissolve calcium and magnesium, producing hard supply

Other Pennsylvania Water Reports

Fullerton

≈ 180+ mg/L

🔴 Very Hard

Whitehall Township

≈ 120–179 mg/L

🟠 Hard

Emmaus

≈ 120–179 mg/L

🟠 Hard

Bethlehem

17.12 mg/L

🟢 Soft

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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 Allentown's water safe to drink?

Yes. Allentown'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 Allentown?

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

The USA national average is 151 mg/L. Allentown (≈ 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 Allentown 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.