Carbondale Water Hardness & Quality Report (2026)
Water Hardness
12.3 grains per gallon
Source
river
pH Level
8.3
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
465.4 mg/L
Est. Daily Cost
$0.56
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 Carbondale, your appliances are currently losing 28% efficiency due to mineral buildup.
| Appliance | In Carbondale | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 2.7 yrs | 8.5 yrs | -68% |
| Washing Machine | 5.8 yrs | 12 yrs | -52% |
| Water Heater | 7.2 yrs | 15 yrs | -52% |
Regional Water Comparison
How Carbondale compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Carbondale, Illinois | 210 mg/L | 7.4 ppt | 🔴 Very Hard | river |
| Herrin, Illinois | 223.5 mg/L | 7.8 ppt | 🔴 Very Hard | river |
| Marion, Illinois | 279.5 mg/L | 9.7 ppt | 🔴 Very Hard | river |
| Cape Girardeau, Missouri | 227.5 mg/L | 7 ppt | 🔴 Very Hard | river |
| Jackson, Missouri | 170.5 mg/L | 5.5 ppt | 🟠 Hard | river |
National Benchmark
How Carbondale compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Carbondale | 210 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Carbondale's Water Unique?
Local geology and source profile
Carbondale, Illinois, in Jackson County — a major southern Illinois University city (Carbondale is a significant Jackson County city — the home of Southern Illinois University Carbondale (SIU Carbondale — one of the most important universities in downstate Illinois; SIU Carbondale is a comprehensive research university with strong programs in aviation, engineering, coal research, and liberal arts; the SIU system has historically been the most important institution of higher education in southern Illinois); Carbondale is surrounded by significant natural recreation areas (Crab Orchard National Wildlife Refuge — one of the most important wildlife refuges in Illinois, immediately east of Carbondale; the Giant City State Park (one of the most scenic and geologically distinctive parks in Illinois, featuring massive sandstone formations); the Shawnee National Forest encompasses much of southern Illinois and provides extensive outdoor recreation), a diverse Jackson County community with a significant African-American, international student, and working-class and university staff population — draws its municipal water supply from Crab Orchard Lake via the City of Carbondale Water Division. Water hardness in Carbondale measures 210 mg/L — classified as hard.
Carbondale's hard supply reflects the southern Illinois Jackson County Carbondale Formation carbonate's calcareous character. The Crab Orchard Lake and Big Muddy River watershed draws from the Pennsylvanian calcareous Carbondale Formation with limited softening, producing the hard 210 mg/L.
At 210 mg/L, Carbondale residents face regular hard water challenges. Monthly descaling and water softeners are recommended. City of Carbondale Water Division consistently delivers water meeting all Illinois EPA and federal EPA Safe Drinking Water Act requirements.
Geology & Source: River supply from the Crab Orchard Lake and Big Muddy River via the City of Carbondale Water Division — the Jackson County southern Illinois Carbondale corridor (Pennsylvanian calcareous Carbondale Formation — the calcareous southern Illinois Jackson County Carbondale Formation carbonate; limited softening); hard supply at 210 mg/L in Jackson County.