Charleston Water Hardness & Quality Report (2026)
Water Hardness
14.3 grains per gallon
Source
river
pH Level
8.5
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
595.9 mg/L
Est. Daily Cost
$0.65
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 Charleston, your appliances are currently losing 33% efficiency due to mineral buildup.
| Appliance | In Charleston | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 4.6 yrs | 12 yrs | -62% |
| Water Heater | 5.8 yrs | 15 yrs | -61% |
Regional Water Comparison
How Charleston compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Charleston, Illinois | 244.5 mg/L | 8.5 ppt | 🔴 Very Hard | river |
| Mattoon, Illinois | 109 mg/L | 3.9 ppt | 🟡 Moderately Hard | river |
| Effingham, Illinois | 207 mg/L | 7.3 ppt | 🔴 Very Hard | river |
| Urbana, Illinois | 264.5 mg/L | 9.2 ppt | 🔴 Very Hard | river |
| Champaign, Illinois | 149.5 mg/L | 5.3 ppt | 🟠 Hard | river |
National Benchmark
How Charleston compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Charleston | 244.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Charleston's Water Unique?
Local geology and source profile
Charleston, Illinois, in Coles County — the Coles County seat in east-central Illinois, home of Eastern Illinois University (EIU), a central Illinois agricultural city in the Embarras River valley — receives its municipal water from the Charleston Water Division, which draws from the Embarras River (a Wabash River tributary flowing through the Illinois Prairie) at the Charleston water intake.
The very hard 244.5 mg/L hardness and elevated TDS of 595.9 mg/L reflect the Embarras River watershed's central Illinois glacial carbonate geology. The Embarras River (locally pronounced "Ambraw") drains the Central Illinois Till Plain — the classic flat agricultural landscape of east-central Illinois underlain by thick Pleistocene glacial till rich in calcareous limestone and dolomite clasts. Beneath the till, the bedrock consists of Pennsylvanian cyclothem sequences (alternating coal seams, calcareous shales, marine limestone, and freshwater shales) and the underlying Mississippian limestone escarpment (the Burlington-Keokuk and Salem Limestone formations). The Pennsylvanian cyclothem limestone layers and the deep carbonate bedrock contribute consistently high dissolved calcium and magnesium to the Embarras River drainage system, producing very hard water typical of the east-central Illinois Wabash drainage.
At 244.5 mg/L, Charleston's water is very hard. Scale builds rapidly in kettles and appliances within weeks, dishwashers require rinse aid or softener salt, and bathroom fixtures develop heavy calcium deposits. Monthly descaling of heating appliances is practical. A water softener is strongly recommended for Charleston households. The PFAS level of 8.5 ppt warrants a certified drinking water filter — the Embarras River corridor's agricultural and light industrial character, the central Illinois chemical farming legacy, and the Scott Air Force Base corridor (southern Illinois — AFFF PFAS source) regional transport all contribute to Coles County's elevated PFAS reading.
Geology & Source: Charleston in Coles County draws from Charleston Water Division treating the Embarras River — the Embarras drains the Central Illinois Till Plain (Pleistocene glacial till over Pennsylvanian cyclothem limestone and shale and Mississippian carbonate bedrock) — Pennsylvanian cyclothem and Mississippian carbonate drainage produces very hard water at 244.5 mg/L with elevated TDS 596 mg/L in this Coles County Illinois city.