Williamstown Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

reservoir

pH Level

5.8

neutral = 7.0

Lead

0.002 mg/L

✓ Below action level

TDS

47 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 Williamstown, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In Williamstown	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 Williamstown compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Williamstown, New Jersey	≈ 120–179 mg/L	19.6 ppt	🟠 Hard	reservoir
Sicklerville, New Jersey	≈ 120–179 mg/L	11.8 ppt	🟠 Hard	groundwater
Pine Hill, New Jersey	≈ 120–179 mg/L	0 ppt	🟠 Hard	reservoir
Glassboro, New Jersey	≈ 120–179 mg/L	105.5 ppt	🟠 Hard	reservoir
Atco, New Jersey	≈ 120–179 mg/L	8.5 ppt	🟠 Hard	groundwater

National Benchmark

How Williamstown compares to the USA average

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

Local geology and source profile

Source: ReservoirTDS: 47 mg/LpH: 5.8

Monroe Township Municipal Utilities Authority supplies water to over 48,000 residents in Monroe Township and nearby communities in Middlesex County. This utility manages multiple water sources and treatment facilities, ensuring compliance with Safe Drinking Water Act standards through published water quality data and annual Consumer Confidence Reports. The Williamstown water originates from the New Jersey Coastal Plain aquifer system, a vast underground network beneath central New Jersey.

The aquifer itself is composed of Quaternary-age glacial deposits sitting atop Cretaceous-age sand, silt, and clay formations. As groundwater naturally filters through these sedimentary layers, it dissolves minerals like calcium and magnesium. This geological process results in a moderately mineralized water supply, which is typical for groundwater-based systems in this region of New Jersey.

Homeowners in Williamstown may notice the effects of this moderately hard water. Mineral scale can accumulate on faucets and showerheads, and you might find that soaps and detergents don't lather as effectively. Over time, this can impact the efficiency and lifespan of appliances like water heaters and dishwashers. A water softener is often recommended to combat these issues, especially for households with high water usage. Residents concerned about specific contaminants like hexavalent chromium and PFNA, which have been detected above EPA health guidelines, should consult the latest Consumer Confidence Report and consider certified filtration systems.

Geology & Source: New Jersey Coastal Plain aquifer system; Cretaceous-age sand, clay, and Quaternary glacial deposits yield moderately hard water.

Other New Jersey Water Reports

Sicklerville

≈ 120–179 mg/L

🟠 Hard

Pine Hill

≈ 120–179 mg/L

🟠 Hard

Glassboro

≈ 120–179 mg/L

🟠 Hard

Atco

≈ 120–179 mg/L

🟠 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 Williamstown's water safe to drink?

Yes. Williamstown'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 Williamstown?

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

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