Harvey Water Hardness & Quality Report (2026)
Water Hardness
10.4 grains per gallon
Source
river
pH Level
8.1
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
357.2 mg/L
Est. Daily Cost
$0.47
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 Harvey, your appliances are currently losing 24% efficiency due to mineral buildup.
| Appliance | In Harvey | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 3.7 yrs | 8.5 yrs | -56% |
| Washing Machine | 7 yrs | 12 yrs | -42% |
| Water Heater | 8.5 yrs | 15 yrs | -43% |
Regional Water Comparison
How Harvey compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Harvey, Illinois | 178 mg/L | 6.3 ppt | 🟠 Hard | river |
| Riverdale, Illinois | 141 mg/L | 5 ppt | 🟠 Hard | river |
| South Holland, Illinois | 260.5 mg/L | 9.1 ppt | 🔴 Very Hard | river |
| Dolton, Illinois | 168.5 mg/L | 6 ppt | 🟠 Hard | river |
| Markham, Illinois | 233 mg/L | 8.1 ppt | 🔴 Very Hard | river |
National Benchmark
How Harvey compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Harvey | 178 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Harvey's Water Unique?
Local geology and source profile
Harvey, Illinois, in Cook County in the south Chicago suburbs, receives its municipal water through Illinois American Water and regional utility supply drawing from the Calumet waterway corridor and blended supply incorporating regional aquifer contributions. Harvey's position in the Calumet Region — historically one of the most industrialized corridors in the Midwest — places it at the confluence of multiple water supply systems. The hardness of 178 mg/L exceeds what the Lake Michigan supply alone would produce (~150 mg/L), indicating significant contribution from the Silurian Dolomite Aquifer underlying the region's western edges or from Calumet River system minerals.
The hard 178 mg/L hardness in Harvey reflects the mineral enrichment associated with the Silurian Dolomite Aquifer influence in southern Cook County. This aquifer — composed of ancient reef-derived Silurian-age dolomite formed approximately 430 million years ago — dissolves calcium magnesium carbonate readily into groundwater, boosting hardness beyond what the Lake Michigan supply delivers through Chicago's treatment system. The Calumet River corridor's industrial history adds complexity to the supply mix, and Harvey's water quality reflects the cumulative effects of urban, industrial, and geological mineral contributions.
At 178 mg/L, Harvey residents experience notably hard water, with white scale forming regularly on all heated surfaces and appliances. Kettles accumulate visible white deposits within weeks, dishwashers leave mineral film on glasses, and showerheads benefit from monthly cleaning. Water heater efficiency decreases over time without descaling maintenance. Descaling every two months keeps small appliances performing well. Given Harvey's industrial history and the associated PFAS background of 6.3 ppt, residents are advised to use a certified carbon block or reverse osmosis drinking filter for daily water consumption, providing protection against both the mineral taste and any legacy contaminant concerns.
Geology & Source: Harvey in Cook County draws from the Calumet River system and regional Illinois American Water supply influenced by Silurian Dolomite Aquifer groundwater blending — the ancient reef-derived dolomite of northeastern Illinois dissolves abundant calcium and magnesium into regional supply — producing hard water at 178 mg/L above what pure Lake Michigan supply would yield for this south Cook County community.