Sterling Water Hardness & Quality Report (2026)
Water Hardness
6.8 grains per gallon
Source
river
pH Level
7.6
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
186.3 mg/L
Est. Daily Cost
$0.31
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 Sterling, your appliances are currently losing 15% efficiency due to mineral buildup.
| Appliance | In Sterling | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.8 yrs | 8.5 yrs | -32% |
| Washing Machine | 9.3 yrs | 12 yrs | -22% |
| Water Heater | 11 yrs | 15 yrs | -27% |
Regional Water Comparison
How Sterling compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Sterling, Illinois | 116 mg/L | 4.2 ppt | 🟡 Moderately Hard | river |
| Dixon, Illinois | 165 mg/L | 5.8 ppt | 🟠 Hard | river |
| Clinton, Iowa | 286 mg/L | 5.9 ppt | 🔴 Very Hard | river |
| Freeport, Illinois | 210.5 mg/L | 7.4 ppt | 🔴 Very Hard | river |
| Kewanee, Illinois | 217.5 mg/L | 7.6 ppt | 🔴 Very Hard | river |
National Benchmark
How Sterling compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Sterling | 116 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Sterling's Water Unique?
Local geology and source profile
Sterling, Illinois, in Whiteside County — a Whiteside County city adjacent to Rock Falls and Dixon on the Rock River in north Illinois — receives its municipal water from the Sterling Water Division, drawing from the Rock River (Whiteside County) through the north Illinois water treatment system.
The moderately hard 116 mg/L hardness and TDS of 186.3 mg/L reflect the north Illinois Rock River supply's moderate Cambrian-Ordovician calcareous character — consistent with other Rock River communities (Dixon: ~115 mg/L; Rockford: ~120 mg/L). The Rock River at Whiteside County drains the Wisconsin Dells region — Cambrian Jordan Sandstone (slightly calcareous), Ordovician Galena Dolomite (dolomite — primary hardness contributor), and Silurian Niagara Dolomite (dolomite — secondary contributor). The Ordovician Galena Dolomite and Silurian Niagara dolomite dissolution produces the moderately hard north Illinois Rock River supply.
At 116 mg/L, Sterling's water is moderately hard — scale builds in kettles and appliances over months, dishwashers benefit from rinse aid, and faucet aerators need periodic cleaning. Quarterly descaling is appropriate. The PFAS level of 4.2 ppt warrants a certified drinking water filter — the Whiteside County north Illinois industrial corridor and the Rock River PFAS background from the Rockford metro industrial complex contribute to Sterling's readings.
Geology & Source: Sterling in Whiteside County draws from the Sterling Water Division on the Rock River (Whiteside County, north Illinois) — the Rock River drains Wisconsin Dells (Cambrian Jordan Sandstone — slightly calcareous, Ordovician Galena Dolomite — dolomitic) — Illinois Whiteside County Rock River Cambrian-Ordovician dolomite watershed produces moderately hard water at 116 mg/L with TDS 186.3 mg/L.