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

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

Barrington Water Hardness & Quality Report (2026)

Water Hardness

very hard

180+ mg/L

Very Hard

estimated · not lab-verified

Source

groundwater

pH Level

neutral = 7.0

Lead

0.002 mg/L

✓ Below action level

TDS

186.3 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 Barrington, your appliances are currently losing 45% efficiency due to mineral buildup.

Appliance	In Barrington	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 Barrington compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Barrington, Illinois	≈ 180+ mg/L	0 ppt	🔴 Very Hard	groundwater
Lake Zurich, Illinois	≈ 180+ mg/L	7 ppt	🔴 Very Hard	groundwater
Wauconda, Illinois	≈ 180+ mg/L	0 ppt	🔴 Very Hard	river
Palatine, Illinois	≈ 120–179 mg/L	0 ppt	🟠 Hard	river
Cary, Illinois	≈ 180+ mg/L	30.3 ppt	🔴 Very Hard	groundwater

National Benchmark

How Barrington compares to the USA average

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

Local geology and source profile

Source: GroundwaterTDS: 186.3 mg/LpH: 8

The Village of Barrington, Illinois, manages its own municipal water system, supplying residents in Cook County. This supply comes exclusively from deep groundwater wells tapping into subterranean aquifers. According to the Illinois EPA, the source water is considered low risk for contamination, thanks to well integrity, construction, and protective geological layers. To address potential lead issues in home plumbing, the utility adds polyphosphates to the treated water.

Barrington's water originates from ancient carbonate aquifers dating back to the Cambrian and Ordovician periods. These formations, including the Galena-Platteville and St. Peter Sandstone sequences, are primarily composed of dolomite and limestone. Because these rock types are quite soluble, groundwater readily picks up significant amounts of calcium and magnesium as it travels through the bedrock, a common characteristic of groundwater in the Chicago region.

This very hard water commonly found in Barrington necessitates extra care for household appliances. Mineral scale builds up inside water heaters, dishwashers, and washing machines, decreasing their efficiency and shortening their lifespan. You'll likely need more soap and detergent to get things clean. Installing a whole-house water softener is highly recommended for homeowners here. It will help combat scale, protect your appliances, and improve cleaning results. Don't forget regular descaling of fixtures and maintenance for any softener system.

Geology & Source: Cambrian and Ordovician dolomite and limestone aquifers; highly soluble carbonate bedrock yields very hard water

Other Illinois Water Reports

Lake Zurich

≈ 180+ mg/L

🔴 Very Hard

Wauconda

≈ 180+ mg/L

🔴 Very Hard

Palatine

≈ 120–179 mg/L

🟠 Hard

Cary

≈ 180+ mg/L

🔴 Very Hard

Report an Issue

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 Barrington's water safe to drink?

Yes. Barrington'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 Barrington?

At ≈ 180+ mg/L (Very Hard), Barrington'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 Barrington compare to the USA average?

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