How does Blue Island's water compare to the national average?

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

Blue Island Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

river

pH Level

8.2

neutral = 7.0

Lead

0.005 mg/L

✓ Below action level

TDS

406.1 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 Blue Island, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In Blue Island	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 Blue Island compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Blue Island, Illinois	≈ 120–179 mg/L	0 ppt	🟠 Hard	river
Morgan Park, Illinois	≈ 180+ mg/L	5.4 ppt	🔴 Very Hard	river
Midlothian, Illinois	≈ 120–179 mg/L	0 ppt	🟠 Hard	river
Mount Greenwood, Illinois	≈ 120–179 mg/L	5.9 ppt	🟠 Hard	river
Riverdale, Illinois	≈ 120–179 mg/L	0 ppt	🟠 Hard	river

National Benchmark

How Blue Island compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Blue Island	≈ 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 Blue Island's Water Unique?

Local geology and source profile

Source: RiverTDS: 406.1 mg/LpH: 8.2

Blue Island Municipal Water Company (also known as the City of Blue Island Water Department), located at 13051 Greenwood Avenue, Blue Island, IL 60406, serves approximately 23,700–23,900 residents across Blue Island in Cook County. Water is sourced from purchased surface water supplied through Chicago's treatment system, drawn from Lake Michigan. The utility treats and distributes this surface water throughout the service area.

The Blue Island supply originates in Lake Michigan, a glacially-formed Great Lakes basin. The watershed encompasses the Lake Michigan drainage area, characterized by glacial deposits and sedimentary geology. As purchased surface water travels through Chicago's treatment infrastructure and Blue Island's aging distribution pipes, it accumulates minerals — particularly calcium and magnesium — from surrounding geological formations and pipe materials, resulting in a hard water supply typical of the Illinois region.

Hard water causes scale buildup on fixtures, showerheads, and heating elements in water heaters, dishwashers, and washing machines, reducing efficiency. Regular descaling is recommended; a water softener is advisable for households seeking to reduce mineral accumulation and extend appliance lifespan. The water meets EPA legal compliance standards with an A rating for legal compliance, though third-party testing has identified contaminants including chromium-6, chloroform, nitrates, radium, monobromoacetic acid, toluene, carbon tetrachloride, and dibromomethane below action levels. Treatment uses clarification and chlorination typical of surface water systems.

Geology & Source: Lake Michigan source via Chicago treatment system — glacially-formed lacustrine basin; minerals from glacial deposits and aging distribution pipes contribute to hard supply

Other Illinois Water Reports

Morgan Park

≈ 180+ mg/L

🔴 Very Hard

Midlothian

≈ 120–179 mg/L

🟠 Hard

Mount Greenwood

≈ 120–179 mg/L

🟠 Hard

Riverdale

≈ 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 Blue Island's water safe to drink?

Yes. Blue Island'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 Blue Island?

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

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