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

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

Woodridge Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

river

pH Level

8.5

neutral = 7.0

Lead

0.008 mg/L

✓ Below action level

TDS

661.9 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 Woodridge, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In Woodridge	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 Woodridge compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Woodridge, Illinois	≈ 120–179 mg/L	0 ppt	🟠 Hard	river
Bolingbrook, Illinois	≈ 120–179 mg/L	7 ppt	🟠 Hard	river
Lisle, Illinois	≈ 120–179 mg/L	0 ppt	🟠 Hard	river
Downers Grove, Illinois	≈ 120–179 mg/L	0 ppt	🟠 Hard	river
Darien, Illinois	≈ 180+ mg/L	0 ppt	🔴 Very Hard	river

National Benchmark

How Woodridge compares to the USA average

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

Local geology and source profile

Source: RiverTDS: 661.9 mg/LpH: 8.5

Illinois American Water serves the Village of Woodridge in DuPage County, Illinois, providing retail water to approximately 35,000 residents across a 12-square-mile service area in the western suburbs of Chicago. The utility purchases treated surface water from the City of Chicago's system, sourced from Lake Michigan via two major intakes: the Jardine Water Purification Plant and the South Water Purification Plant. No local treatment plants operate in Woodridge; water is distributed through Illinois American Water's mains after regional filtration and disinfection. The utility can be contacted at 630-739-8959 at 1000 Internationale Parkway, Woodridge, IL 60517.

The supply originates from the Lake Michigan watershed, spanning over 118,000 square miles across four states and two Canadian provinces. Underlying geology features Precambrian crystalline basement overlain by Paleozoic sedimentary formations — including Ordovician dolomites and Silurian limestones that outcrop in tributary areas. Glacial deposits from multiple Pleistocene advances, such as Wisconsinan till and outwash, form nearshore sediments that leach minerals into the water column. This carbonate-dominated geology results in a hard supply with elevated dissolved solids, persistently mineralized despite the lake's vast dilution capacity.

Hard water causes significant scale buildup in water heaters — reducing efficiency by up to 20–30% via calcium carbonate insulation on heating elements — and clogs dishwashers, washing machines, faucets, showerheads, and coffee makers. Regular maintenance includes monthly vinegar descaling for visible fixtures, annual anode rod checks in heaters, and scale-inhibiting filters. A water softener is strongly recommended for households in this hard water region. Water complies with EPA standards for pH (7.5–8.5); TTHMs and hexavalent chromium exceed health guidelines in some analyses but remain below legal MCLs; treatment involves ozonation and chloramination for microbial safety.

Geology & Source: Lake Michigan basin; Precambrian bedrock overlain by Paleozoic Ordovician dolomites and Silurian limestones — carbonate-rich Pleistocene Wisconsinan glacial drift leaches calcium and magnesium; hard supply

Other Illinois Water Reports

Bolingbrook

≈ 120–179 mg/L

🟠 Hard

Lisle

≈ 120–179 mg/L

🟠 Hard

Downers Grove

≈ 120–179 mg/L

🟠 Hard

Darien

≈ 180+ mg/L

🔴 Very 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 Woodridge's water safe to drink?

Yes. Woodridge'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 Woodridge?

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

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