Yorkville Water Hardness & Quality Report (2026)
Water Hardness
16.1 grains per gallon
Source
river
pH Level
8.5
neutral = 7.0
Lead
0.009 mg/L
✓ Below action level
TDS
725.5 mg/L
Est. Daily Cost
$0.73
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 Yorkville, your appliances are currently losing 37% efficiency due to mineral buildup.
| Appliance | In Yorkville | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 3.4 yrs | 12 yrs | -72% |
| Water Heater | 5 yrs | 15 yrs | -67% |
Regional Water Comparison
How Yorkville compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Yorkville, Illinois | 275 mg/L | 9.6 ppt | 🔴 Very Hard | river |
| Oswego, Illinois | 133 mg/L | 4.8 ppt | 🟠 Hard | river |
| Montgomery, Illinois | 143.5 mg/L | 5.1 ppt | 🟠 Hard | river |
| Aurora, Illinois | 279.5 mg/L | 9.7 ppt | 🔴 Very Hard | river |
| North Aurora, Illinois | 234 mg/L | 8.2 ppt | 🔴 Very Hard | river |
National Benchmark
How Yorkville compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Yorkville | 275 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
Bring Badger-quality water to your Yorkville home
Shop water softeners on Amazon.com →
What Makes Yorkville's Water Unique?
Local geology and source profile
Yorkville, Illinois, in Kendall County — the Kendall County seat adjacent to Oswego and Plano, on the Fox River in the southwest Chicago metro Fox Valley corridor — receives its municipal water from the City of Yorkville Water Division, drawing from the Fox River or from municipal wells in the Kendall County Fox Valley aquifer system.
The very hard 275 mg/L hardness and high TDS of 725.5 mg/L reflect the Fox Valley's Silurian dolomite geology — among the hardest water in the greater Chicago metro. The Fox River in Kendall County drains the Silurian Niagara Dolomite (thick dolomite platform — extremely high carbonate dissolution, primary hardness source), the Ordovician Galena Group dolomite (deep carbonate), and calcareous Pleistocene Wisconsin till derived from glacial grinding of the Silurian bedrock. The Fox Valley Silurian dolomite produces the consistently very hard water for all Fox River communities (Aurora-Elgin-Yorkville corridor).
At 275 mg/L with TDS 725.5 mg/L, Yorkville's water is very hard. A water softener is essential. Scale builds within days on all surfaces, and appliances have dramatically shortened lifespans without softening. The PFAS level of 9.6 ppt warrants a certified reverse osmosis drinking water filter — the Kendall County industrial corridor, the Fox River PFAS legacy from upstream industrial sources (Waukegan-North Chicago), and the northeast Illinois PFAS complex contribute to Yorkville's elevated readings.
Geology & Source: Yorkville in Kendall County draws from the Yorkville Water Division on the Fox River (Kendall County) — the Fox River drains the Silurian Niagara Dolomite platform (Kane-Kendall Counties, northeast Illinois) and calcareous Pleistocene Wisconsin till — Illinois Fox Valley Silurian dolomite carbonate drainage produces very hard water at 275 mg/L with high TDS 725.5 mg/L in this Kendall County Illinois city.