Douglas Water Hardness & Quality Report (2026)
Water Hardness
10.1 grains per gallon
Source
river
pH Level
8
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
343.1 mg/L
Est. Daily Cost
$0.46
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 Douglas, your appliances are currently losing 23% efficiency due to mineral buildup.
| Appliance | In Douglas | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 3.9 yrs | 8.5 yrs | -54% |
| Washing Machine | 7.2 yrs | 12 yrs | -40% |
| Water Heater | 8.7 yrs | 15 yrs | -42% |
Regional Water Comparison
How Douglas compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Douglas, Illinois | 173.5 mg/L | 6.1 ppt | 🟠 Hard | river |
| Grand Boulevard, Illinois | 108 mg/L | 3.9 ppt | 🟡 Moderately Hard | river |
| Near South Side, Illinois | 201 mg/L | 7.1 ppt | 🔴 Very Hard | river |
| Kenwood, Illinois | 215.5 mg/L | 7.5 ppt | 🔴 Very Hard | river |
| Bridgeport, Illinois | 220 mg/L | 7.7 ppt | 🔴 Very Hard | river |
National Benchmark
How Douglas compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Douglas | 173.5 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Douglas's Water Unique?
Local geology and source profile
Douglas, Illinois, in Cook County — a Chicago South Side neighborhood adjacent to the Bronzeville historic district, one of the historically significant African American cultural districts in Chicago during the Great Migration era — receives its municipal water from the City of Chicago Department of Water Management, which draws from Lake Michigan at the Chicago offshore intake cribs, serving all of Chicago including the Douglas South Side neighborhood.
The hard 173.5 mg/L hardness and TDS of 343.1 mg/L reflect Chicago's Lake Michigan supply — the same Great Lakes carbonate platform water serving all Chicago neighborhoods. The slightly softer reading (173.5 mg/L) compared to East Garfield Park (204.5 mg/L) and other Chicago neighborhoods suggests distribution zone variability in the Chicago Water Department's massive distribution system (different water age, temperature, and treatment effects across the system). Lake Michigan at Chicago receives dissolved carbonate from the Silurian Niagara Dolomite and Devonian limestone of the Michigan-Indiana shoreline carbonate platform.
At 173.5 mg/L, Douglas's water is moderately hard — scale builds in kettles and appliances over months, dishwashers benefit from rinse aid, and bathroom fixtures develop calcium deposits. Quarterly descaling is appropriate. The PFAS level of 6.1 ppt warrants a certified drinking water filter — the Chicago Calumet Industrial District (heavy industry and chemical manufacturing on the south lakefront), the Lake Michigan basin's accumulated PFAS, and the greater Chicago industrial legacy contribute to the South Side supply's PFAS readings.
Geology & Source: Douglas in Cook County is served by the City of Chicago on Lake Michigan — Lake Michigan drains the Great Lakes basin with the Silurian-Devonian carbonate platform of Michigan and Indiana shore contributing dissolved carbonate — Great Lakes carbonate platform drainage produces hard water at 173.5 mg/L with TDS 343 mg/L in this Chicago Illinois neighborhood.