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

The USA national average is 151 mg/L. Montclair (≈ 180+ mg/L) is 189 mg/L harder than average.

Montclair Water Hardness & Quality Report (2026)

Water Hardness

very hard

180+ mg/L

Very Hard

estimated · not lab-verified

Source

reservoir

pH Level

7.5

neutral = 7.0

Lead

0.003 mg/L

✓ Below action level

TDS

137.9 mg/L

Est. Daily Cost

$0.91

energy & soap waste

Source: See methodology section below · Updated 2026

very hard180+ mg/LVery Hard · 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 Montclair, your appliances are currently losing 45% efficiency due to mineral buildup.

Appliance	In Montclair	Soft Water City	Efficiency Loss
Kettle	4.7 yrs	8.5 yrs	-45%
Washing Machine	6.6 yrs	12 yrs	-45%
Water Heater	8.3 yrs	15 yrs	-45%

Regional Water Comparison

How Montclair compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Montclair, New Jersey	≈ 180+ mg/L	7.2 ppt	🔴 Very Hard	reservoir
Upper Montclair, New Jersey	≈ 120–179 mg/L	13.1 ppt	🟠 Hard	reservoir
Bloomfield, New Jersey	≈ 120–179 mg/L	0 ppt	🟠 Hard	reservoir
Verona, New Jersey	≈ 120–179 mg/L	93.7 ppt	🟠 Hard	reservoir
Cedar Grove, New Jersey	≈ 120–179 mg/L	27.8 ppt	🟠 Hard	reservoir

National Benchmark

How Montclair compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Montclair	≈ 180+ mg/L	🔴 High
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes Montclair's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 137.9 mg/LpH: 7.5

The North Jersey District Water Supply Commission (NJDWSC) supplies Montclair, New Jersey, through the 29.6 billion-gallon Wanaque Reservoir and Treatment Plant and the seven-billion-gallon Monksville Reservoir. Water is received by the Township of Montclair at the Grove Street Pumping Station and distributed throughout Essex County. Three municipal wells — Glenfield, Lorraine, and Rand — equipped with carbon treatment, supplement supply seasonally.

The Wanaque River watershed spans the New Jersey Highlands, where metamorphic and igneous bedrock — including gneiss and basalt from the Newark Basin — dissolves calcium and magnesium into surface water. Limestone and dolomite in surrounding drainage areas further enrich the chemistry. Seasonal well supplements tap fractured bedrock groundwater of similar character, collectively yielding a hard supply without significant softening from glacial till alone.

Very hard water causes significant scale buildup in water heaters, dishwashers, washing machines, and coffee makers, with poor soap lathering leading to dry skin and hair. Regular vinegar descaling and scale inhibitors are recommended; a water softener mitigates appliance damage and improves plumbing efficiency. Water pH is 7.8; lead and copper rules are met, with iron below detectable limits. Unregulated contaminants detected include PFOA (0.046 ppb), 1,4-dioxane (0.108 ppb), chromium-6 (0.074 ppb), chlorate (48.874 ppb), and strontium (596.426 ppb). Treatment at the Wanaque plant involves filtration and disinfection; municipal wells use carbon absorbers.

Geology & Source: Wanaque River watershed, New Jersey Highlands; Precambrian and Paleozoic granitic gneisses, schists, and Newark Basin trap rock; limestone and dolomite in drainage areas — calcium and magnesium dissolution yields hard supply

Other New Jersey Water Reports

Upper Montclair

≈ 120–179 mg/L

🟠 Hard

Bloomfield

≈ 120–179 mg/L

🟠 Hard

Verona

≈ 120–179 mg/L

🟠 Hard

Cedar Grove

≈ 120–179 mg/L

🟠 Hard

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

Frequently Asked Questions

Is Montclair's water safe to drink?

Yes. Montclair's water meets all federal safety standards. The hardness is ≈ 180+ mg/L (Very Hard), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Montclair?

At ≈ 180+ mg/L (Very Hard), Montclair'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 45%.

How does Montclair compare to the USA average?

The USA national average is 151 mg/L. Montclair (≈ 180+ mg/L) is 189 mg/L above the national average. The softest major city is Scarsdale at just 0.02 mg/L.

Data Sources & Methodology

Water quality data for Montclair 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.