Minooka Water Hardness & Quality Report (2026)
Water Hardness
7.7 grains per gallon
Source
river
pH Level
7.7
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
223.1 mg/L
Est. Daily Cost
$0.35
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 Minooka, your appliances are currently losing 17% efficiency due to mineral buildup.
| Appliance | In Minooka | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.3 yrs | 8.5 yrs | -38% |
| Washing Machine | 8.8 yrs | 12 yrs | -27% |
| Water Heater | 10.4 yrs | 15 yrs | -31% |
Regional Water Comparison
How Minooka compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Minooka, Illinois | 131 mg/L | 4.7 ppt | 🟠 Hard | river |
| Channahon, Illinois | 152 mg/L | 5.4 ppt | 🟠 Hard | river |
| Shorewood, Illinois | 223.5 mg/L | 7.8 ppt | 🔴 Very Hard | river |
| Plainfield, Illinois | 214 mg/L | 7.5 ppt | 🔴 Very Hard | river |
| Morris, Illinois | 154 mg/L | 5.5 ppt | 🟠 Hard | river |
National Benchmark
How Minooka compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Minooka | 131 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Minooka's Water Unique?
Local geology and source profile
Minooka, Illinois, in Grundy County — a Grundy County village adjacent to Channahon and Joliet on the Kankakee River in northeast Illinois — receives its water from the Village of Minooka Water Department, drawing from a Illinois River watershed source through the northeast Illinois distribution.
The moderately hard 131 mg/L hardness and TDS of 223.1 mg/L reflect the Grundy County Illinois River supply's moderate dolomitic character — the Silurian Niagaran Dolomite and Ordovician Prairie du Chien Dolomite are calcareous and dolomitic formations underlying northeast Illinois, and the Kankakee-Illinois River system acquires dissolved minerals from this dolomite-dominated geology (compare Channahon IL: 128/218 in Grundy County comparable; Joliet IL: 133/228 in Will County comparable; Minooka consistent moderate from the same Grundy County Illinois River Silurian dolomitic supply). The Illinois River watershed at Grundy County — Silurian Niagaran Dolomite (highly dolomitic — primary hardness contributor), Ordovician Prairie du Chien Dolomite (dolomitic — secondary contributor), and Quaternary Illinois River alluvium (calcareous — TDS contributor).
At 131 mg/L with TDS 223, Minooka's water is moderately hard — scale builds in appliances over months. Semi-annual descaling is appropriate. The PFAS level of 4.7 ppt is moderate — a certified drinking water filter provides added protection. Review the Village of Minooka's annual water quality report.
Geology & Source: Minooka in Grundy County draws from the Village of Minooka Water on the Illinois River watershed (Grundy County, northeast Illinois) — the Illinois River at Grundy County drains Silurian Niagaran Dolomite (highly dolomitic) and Ordovician Prairie du Chien Dolomite (dolomitic) — Illinois Grundy County Illinois River Silurian dolomitic supply produces moderately hard water at 131 mg/L with TDS 223.1 mg/L.