La Grange Water Hardness & Quality Report (2026)
Water Hardness
14.5 grains per gallon
Source
river
pH Level
8.5
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
608 mg/L
Est. Daily Cost
$0.66
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 La Grange, your appliances are currently losing 33% efficiency due to mineral buildup.
| Appliance | In La Grange | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 4.4 yrs | 12 yrs | -63% |
| Water Heater | 5.7 yrs | 15 yrs | -62% |
Regional Water Comparison
How La Grange compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ La Grange, Illinois | 247.5 mg/L | 8.6 ppt | 🔴 Very Hard | river |
| Brookfield, Illinois | 229 mg/L | 8 ppt | 🔴 Very Hard | river |
| La Grange Park, Illinois | 247.5 mg/L | 8.6 ppt | 🔴 Very Hard | river |
| Western Springs, Illinois | 193.5 mg/L | 6.8 ppt | 🔴 Very Hard | river |
| Westchester, Illinois | 192 mg/L | 6.8 ppt | 🔴 Very Hard | river |
National Benchmark
How La Grange compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ La Grange | 247.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes La Grange's Water Unique?
Local geology and source profile
La Grange, Illinois, in Cook County — a Cook County village adjacent to Western Springs and Countryside in the southwest Chicago suburb — receives its municipal water from Illinois American Water, drawing from Lake Michigan (Cook County) through the southwest Chicago metro distribution system.
The very hard 247.5 mg/L hardness and elevated TDS of 608 mg/L reflect the southwest Chicago Lake Michigan supply's intense Silurian Dolomite character — consistent with other southwest Cook County communities (Bridgeview: 248 mg/L; Countryside: ~245 mg/L). Lake Michigan at Cook County is underlain by the Silurian Niagara Dolomite (the dominant northeast Illinois carbonate platform — very high hardness contributor), Devonian Milwaukee Formation (calcareous), and Ordovician Galena Dolomite (calcareous). The pervasive Niagara Dolomite dissolution into the Chicago metro water supply produces the very hard southwest Chicago water.
At 247.5 mg/L with TDS 608, La Grange's water is very hard. A water softener is strongly recommended. Scale builds rapidly on all surfaces, appliance lifespans are significantly shortened, and water heaters require annual descaling without softening. The PFAS level of 8.6 ppt warrants a certified reverse osmosis drinking water filter — the Cook County southwest Chicago industrial corridor and the Lake Michigan PFAS background from the Chicago metropolitan industrial complex contribute to La Grange's elevated readings.
Geology & Source: La Grange in Cook County draws from the Illinois American Water on Lake Michigan (Cook County, northeast Illinois) — Lake Michigan at Cook County is underlain by Silurian Niagara Dolomite and Devonian Milwaukee Formation (soluble carbonate) — Illinois Cook County Lake Michigan Silurian-Devonian carbonate watershed produces very hard water at 247.5 mg/L with TDS 608 mg/L in this Cook County Illinois village.