St. Charles Water Hardness & Quality Report (2026)
Water Hardness
12.6 grains per gallon
Source
river
pH Level
8.3
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
488.6 mg/L
Est. Daily Cost
$0.58
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 St. Charles, your appliances are currently losing 29% efficiency due to mineral buildup.
| Appliance | In St. Charles | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 2.5 yrs | 8.5 yrs | -71% |
| Washing Machine | 5.6 yrs | 12 yrs | -53% |
| Water Heater | 6.9 yrs | 15 yrs | -54% |
Regional Water Comparison
How St. Charles compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ St. Charles, Illinois | 216.5 mg/L | 7.6 ppt | 🔴 Very Hard | river |
| Geneva, Illinois | 240.5 mg/L | 8.4 ppt | 🔴 Very Hard | river |
| Batavia, Illinois | 121.5 mg/L | 4.4 ppt | 🟠 Hard | river |
| South Elgin, Illinois | 257.5 mg/L | 9 ppt | 🔴 Very Hard | river |
| Village of Campton Hills, Illinois | 165.5 mg/L | 5.9 ppt | 🟠 Hard | river |
National Benchmark
How St. Charles compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ St. Charles | 216.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes St. Charles's Water Unique?
Local geology and source profile
St. Charles, Illinois, in Kane County — a major northwest Kane County Fox River Valley suburban community (St. Charles is one of the premier Fox River Valley communities in Kane County — a historically significant and affluent northwest suburban community on the Fox River, known for its beautifully preserved downtown riverfront, Victorian architecture, and the Kane County Fairgrounds), home of the Arcada Theatre (a historic 1926 theater in downtown St. Charles — one of the well-preserved 1920s movie palaces in the Chicago metro area, now used for live events), a diverse Kane County community with a significant professional and affluent suburban population, and adjacent to Geneva and Batavia in the historic Fox River Valley tri-cities — draws its municipal water supply from the Fox River via the City of St. Charles Water Division. Water hardness in St. Charles measures 216.5 mg/L — classified as very hard.
St. Charles's very hard supply reflects the Kane County Fox River watershed's highly calcareous Paleozoic dolomite geology. The Fox River at St. Charles–Kane County drains: the Silurian Niagaran Dolomite (highly calcareous dolomite — the primary Kane County bedrock aquifer and watershed rock); and the Wisconsin Age calcareous glacial drift. City of St. Charles applies treatment producing the very hard 216.5 mg/L.
At 216.5 mg/L, St. Charles residents face significant hard water challenges. Regular water softeners and descaling are strongly recommended. City of St. Charles Water Division consistently delivers water meeting all Illinois EPA and EPA Safe Drinking Water Act requirements.
Geology & Source: River supply from the Fox River via the City of St. Charles Water Division — the Kane County northwest Chicago suburban Fox River Valley (Silurian calcareous Niagaran Dolomite and Devonian calcareous carbonate — the highly calcareous Kane County Fox River Valley Paleozoic dolomite; Fox River supply with treatment); very hard supply at 216.5 mg/L in Kane County.