How does River Forest's water compare to the national average?

The USA national average is 151 mg/L. River Forest (137.5 mg/L) is 13 mg/L softer than average.

River Forest Water Hardness & Quality Report (2026)

Water Hardness

137.5mg/L

Hard

8 grains per gallon

Source

river

pH Level

7.8

neutral = 7.0

Lead

0.003 mg/L

✓ Below action level

TDS

240 mg/L

Est. Daily Cost

$0.37

energy & soap waste

Source: See methodology section below · Updated 2026

137.5mg/L as CaCO₃Hard

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 River Forest, your appliances are currently losing 18% efficiency due to mineral buildup.

Appliance	In River Forest	Soft Water City	Efficiency Loss
Kettle	7 yrs	8.5 yrs	-18%
Washing Machine	9.8 yrs	12 yrs	-18%
Water Heater	12.3 yrs	15 yrs	-18%

Regional Water Comparison

How River Forest compares to its nearest neighbours

City	Hardness	Risk	Source
▶ River Forest, Illinois	137.5 mg/L	🟠 Hard	river
Forest Park, Illinois	≈ 180+ mg/L	🔴 Very Hard	river
Elmwood Park, Illinois	≈ 120–179 mg/L	🟠 Hard	river
Oak Park, Illinois	≈ 120–179 mg/L	🟠 Hard	river
Maywood, Illinois	≈ 120–179 mg/L	🟠 Hard	river

National Benchmark

How River Forest compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ River Forest	137.5 mg/L	🟠 Moderate
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes River Forest's Water Unique?

Local geology and source profile

Source: RiverTDS: 240 mg/LpH: 7.8

The Village of River Forest Water Utility provides water to 11,172 residents in River Forest, Illinois. This utility doesn't run its own treatment facilities. Instead, it purchases treated surface water from the City of Chicago. Chicago's water treatment plants draw directly from Lake Michigan, which serves as the primary source for River Forest's supply. The treated water travels through Chicago's municipal system before reaching River Forest's distribution network at 400 Park Avenue.

The water originates from Lake Michigan, a vast freshwater body shaped by ancient glacial activity. The land around the lake features glacial deposits from the Pleistocene epoch lying atop Paleozoic bedrock, including Silurian and Ordovician dolomite and limestone formations. However, the immense volume of Lake Michigan and its constant replenishment from rain and rivers mean its water is naturally soft. This contrasts sharply with the harder groundwater found deeper in central and southern Illinois, which often contains higher mineral content.

Because River Forest's water is soft, homeowners typically won't see much scale buildup on their appliances or pipes. You'll likely use less soap and detergent, too, meaning a water softener probably isn't necessary. However, very soft water can sometimes be corrosive to certain plumbing materials. To prevent this, the City of Chicago adjusts the water's pH and implements corrosion control measures at its treatment plants before sending the water to River Forest. The water is also treated with fluoride for dental health and disinfected using hypochlorite.

Geology & Source: Lake Michigan surface water; glacial origins and large volume produce soft water

Other Illinois Water Reports

Forest Park

≈ 180+ mg/L

🔴 Very Hard

Elmwood Park

≈ 120–179 mg/L

🟠 Hard

Oak Park

≈ 120–179 mg/L

🟠 Hard

Maywood

≈ 120–179 mg/L

🟠 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 River Forest's water safe to drink?

Yes. River Forest's water meets all federal safety standards. The hardness is 137.5 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 River Forest?

At 137.5 mg/L (Hard), River Forest'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 18%.

How does River Forest compare to the USA average?

The USA national average is 151 mg/L. River Forest (137.5 mg/L) is 13 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 River Forest 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.