Aurora Water Hardness & Quality Report (2026)
Water Hardness
16.3 grains per gallon
Source
river
pH Level
8.5
neutral = 7.0
Lead
0.01 mg/L
✓ Below action level
TDS
745.5 mg/L
Est. Daily Cost
$0.75
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 Aurora, your appliances are currently losing 37% efficiency due to mineral buildup.
| Appliance | In Aurora | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 3.3 yrs | 12 yrs | -73% |
| Water Heater | 5 yrs | 15 yrs | -67% |
Regional Water Comparison
How Aurora compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Aurora, Illinois | 279.5 mg/L | 9.7 ppt | 🔴 Very Hard | river |
| Montgomery, Illinois | 143.5 mg/L | 5.1 ppt | 🟠 Hard | river |
| North Aurora, Illinois | 234 mg/L | 8.2 ppt | 🔴 Very Hard | river |
| Oswego, Illinois | 133 mg/L | 4.8 ppt | 🟠 Hard | river |
| Batavia, Illinois | 121.5 mg/L | 4.4 ppt | 🟠 Hard | river |
National Benchmark
How Aurora compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Aurora | 279.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Aurora's Water Unique?
Local geology and source profile
Aurora, Illinois draws its municipal water supply from the Fox River, operated by the City of Aurora Water Department at a river intake in Kane County. The Fox River flows southward through northeastern Illinois from Wisconsin, collecting runoff from glaciated terrain before reaching Aurora's water intake. Raw water is treated at the Aurora Water Treatment Facility on the river bank before distribution throughout the city and neighbouring communities. Aurora's water hardness measures 279.5 mg/L — classified as very hard — one of the harder supplies among major Illinois municipalities.
Aurora's very hard water is a direct product of the Fox River watershed's bedrock geology. The river and its tributaries drain the northeastern Illinois bedrock plain underlain by Silurian Niagaran Dolomite — a highly soluble, thick carbonate formation that weathers freely and contributes massive calcium and magnesium loads to groundwater and surface water alike. Beneath the Silurian dolomite lies the Ordovician Galena–Platteville Dolomite and St. Peter Sandstone — additional calcium-bearing formations that discharge into the regional groundwater system and eventually into the Fox River. Glacial drift deposited over this carbonate bedrock further contributes dissolved calcium to surface runoff, maintaining consistently high hardness year-round.
With hardness at 279.5 mg/L, Aurora residents face significant scale management challenges. White calcium deposits accumulate rapidly on shower screens, tile grout, faucet aerators, and inside kettles — weekly cleaning with vinegar or descaling agents is a standard routine. Water heaters experience heavy scale accumulation on heating elements within months of installation; annual professional descaling or whole-house water softener installation is strongly advised. Dishwashers should be operated with rinse-aid and have their filters cleaned regularly to prevent scale build-up in the spray arms. Despite the hardness, Aurora Water consistently produces EPA-compliant, safe drinking water.
Geology & Source: River supply from the Fox River in northeastern Illinois — the river drains Silurian Niagaran Dolomite and Ordovician carbonate formations underlying the Chicago bedrock plain, where dissolution of ancient dolomite and limestone produces very hard supply at 279.5 mg/L.