Robertsville Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

reservoir

pH Level

6.8

neutral = 7.0

Lead

0.001 mg/L

✓ Below action level

TDS

197 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 Robertsville, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In Robertsville	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 Robertsville compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Robertsville, New Jersey	≈ 120–179 mg/L	5.4 ppt	🟠 Hard	reservoir
Marlboro, New Jersey	≈ 120–179 mg/L	84.4 ppt	🟠 Hard	reservoir
Freehold, New Jersey	≈ 120–179 mg/L	57.4 ppt	🟠 Hard	reservoir
South Old Bridge, New Jersey	≈ 120–179 mg/L	10.2 ppt	🟠 Hard	reservoir
Old Bridge, New Jersey	124 mg/L	46.9 ppt	🟠 Hard	reservoir

National Benchmark

How Robertsville compares to the USA average

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

Local geology and source profile

Source: ReservoirTDS: 197 mg/LpH: 6.8

Robertsville, an unincorporated community within Old Bridge Township, Middlesex County, New Jersey, gets its water from the Middlesex Water Company. This private utility serves much of central New Jersey, drawing primarily from the Cohansey-Kirkwood aquifer through several well fields. Occasionally, the supply is boosted with purchased surface water from the Raritan River. Important facilities serving the Robertsville area include the Park Avenue Well Field and the Carson Road treatment plant in Old Bridge. The water originates from the local groundwater recharge zone within the coastal plain section of the Raritan River watershed.

The Cohansey-Kirkwood aquifer is composed of Quaternary and Tertiary sands and clays, featuring glauconitic formations that give the water a mineralized quality. Sediments washed down from the Appalachian Mountains upstream introduce calcium and magnesium from weathered carbonate rocks. This combination results in a hard water supply that can fluctuate in mineral content depending on aquifer levels and seasonal recharge.

Homeowners in Robertsville often notice significant scale buildup in their plumbing, appliances like water heaters and dishwashers, and washing machines, which can reduce efficiency and shorten their lifespan. Soap scum can be a problem in showers, and laundry might feel stiff. Regular maintenance, such as descaling fixtures with vinegar, using scale inhibitors, and flushing hot water heaters annually, is advised. For a more comprehensive solution to protect appliances and improve daily life, installing a whole-house water softener is a recommended option.

Geology & Source: Cohansey-Kirkwood aquifer system; Miocene-Pliocene sands, gravels, silts, clays with shell fragments and glauconite; Appalachian-derived limestone and dolomite contribute to hard water

Other New Jersey Water Reports

Marlboro

≈ 120–179 mg/L

🟠 Hard

Freehold

≈ 120–179 mg/L

🟠 Hard

South Old Bridge

≈ 120–179 mg/L

🟠 Hard

Old Bridge

124 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 Robertsville's water safe to drink?

Yes. Robertsville'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 Robertsville?

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

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