Des Plaines Water Hardness & Quality Report (2026)
Water Hardness
8.9 grains per gallon
Source
river
pH Level
7.9
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
278.3 mg/L
Est. Daily Cost
$0.40
energy & soap waste
Source: USGS Water Quality Portal · Updated 2026
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 Des Plaines, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Des Plaines | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.6 yrs | 8.5 yrs | -46% |
| Washing Machine | 8 yrs | 12 yrs | -33% |
| Water Heater | 9.5 yrs | 15 yrs | -37% |
Regional Water Comparison
How Des Plaines compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Des Plaines, Illinois | 151.5 mg/L | 5.4 ppt | 🟠 Hard | river |
| Park Ridge, Illinois | 160 mg/L | 5.7 ppt | 🟠 Hard | river |
| Mount Prospect, Illinois | 177 mg/L | 6.2 ppt | 🟠 Hard | river |
| Niles, Illinois | 227.5 mg/L | 7.9 ppt | 🔴 Very Hard | river |
| Prospect Heights, Illinois | 268.5 mg/L | 9.3 ppt | 🔴 Very Hard | river |
National Benchmark
How Des Plaines compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Des Plaines | 151.5 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
Bring Badger-quality water to your Des Plaines home
Shop water softeners on Amazon.com →
What Makes Des Plaines's Water Unique?
Local geology and source profile
Des Plaines, Illinois, in northwest Cook County adjacent to O'Hare International Airport — a major northwest Chicago suburb known as the site of the original McDonald's restaurant (Ray Kroc's first franchise, 1955), now a diverse commercial and residential community — draws its municipal water supply from Lake Michigan via the City of Chicago Department of Water Management (DWM) and the City of Des Plaines Water Department. Water hardness in Des Plaines measures 151.5 mg/L — classified as moderately hard.
Des Plaines' moderate hardness reflects the northwest Cook County Lake Michigan metropolitan distribution. Lake Michigan water at the Chicago DWM intake carries moderate calcareous content from the Silurian Niagaran Dolomite and Ordovician Galena–Platteville Formation carbonate geology of the Great Lakes Basin watershed. The Des Plaines distribution receives Chicago metropolitan Lake Michigan water distributed through the northwest Cook County suburban transmission system — the O'Hare Airport corridor distribution infrastructure dating from Des Plaines' post-WWII suburban expansion, particularly the 1950s–1970s build-out associated with O'Hare Airport construction. The Chicago metropolitan Lake Michigan supply at 151.5 mg/L is consistent with the northwest Cook County distribution zone.
At 151.5 mg/L, Des Plaines residents face regular hard water challenges. Scale deposits form on faucet aerators, showerheads, and appliances within weeks — monthly descaling with citric acid solution is standard maintenance. City of Des Plaines Water Department consistently delivers water meeting all Illinois EPA and federal EPA Safe Drinking Water Act requirements.
Geology & Source: Lake supply from Lake Michigan via the City of Chicago Department of Water Management (DWM) and the City of Des Plaines Water Department — the north Cook County Lake Michigan distribution; moderately hard supply at 151.5 mg/L in Cook County — reflecting the Chicago metropolitan area Lake Michigan water in the Des Plaines northwest suburban distribution.