Lake in the Hills Water Hardness & Quality Report (2026)
Water Hardness
180+ mg/L
Very Hardestimated · not lab-verified
Source
groundwater
pH Level
7.4
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
357 mg/L
Est. Daily Cost
$0.91
energy & soap waste
Source: See methodology section below · 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 Lake in the Hills, your appliances are currently losing 45% efficiency due to mineral buildup.
| Appliance | In Lake in the Hills | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.7 yrs | 8.5 yrs | -45% |
| Washing Machine | 6.6 yrs | 12 yrs | -45% |
| Water Heater | 8.3 yrs | 15 yrs | -45% |
Regional Water Comparison
How Lake in the Hills compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Lake in the Hills, Illinois | ≈ 180+ mg/L | 0 ppt | 🔴 Very Hard | groundwater |
| Algonquin, Illinois | ≈ 180+ mg/L | 0 ppt | 🔴 Very Hard | groundwater |
| Crystal Lake, Illinois | ≈ 120–179 mg/L | 9.1 ppt | 🟠 Hard | groundwater |
| Carpentersville, Illinois | ≈ 120–179 mg/L | 0 ppt | 🟠 Hard | groundwater |
| Cary, Illinois | ≈ 180+ mg/L | 30.3 ppt | 🔴 Very Hard | groundwater |
National Benchmark
How Lake in the Hills compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Lake in the Hills | ≈ 180+ mg/L | 🔴 High |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
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What Makes Lake in the Hills's Water Unique?
Local geology and source profile
The Village of Lake in the Hills Water Division serves the community in Cook County, Illinois, drawing exclusively from groundwater sources. The utility operates treatment facilities employing filtration and water softening processes to manage the naturally hard supply. Administrative offices are located at 600 Harvest Gate, Lake in the Hills, IL 60156; the division can be contacted at 847-960-7500.
The water supply originates from deep groundwater aquifers beneath northern Illinois, primarily the Cambrian-Ordovician aquifer system. This region's geology is characterized by Ordovician dolomite and limestone formations that have been extensively dissolved by percolating groundwater over geological time. The carbonate-rich bedrock contributes high concentrations of dissolved calcium and magnesium minerals to the aquifer, making the groundwater very hard before treatment.
At the very hard classification level, scale buildup accumulates rapidly in water heaters, dishwashers, washing machines, and plumbing fixtures, reducing efficiency and shortening appliance lifespan. The utility's treatment includes softening, though many residents may still benefit from point-of-use or whole-home softening systems to further protect appliances. The Village publishes an annual Consumer Confidence Report detailing water quality findings; the utility has reported contaminants above EPA health-based guidelines in at least one area served, and residents are encouraged to review it for current local water chemistry detail.
Geology & Source: Northern Illinois deep groundwater — Cambrian-Ordovician aquifer system; Ordovician dolomite and limestone dissolve readily releasing calcium and magnesium; very hard karst-influenced supply
Other Illinois Water Reports
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Frequently Asked Questions
Is Lake in the Hills's water safe to drink?
Do I need a water softener in Lake in the Hills?
How does Lake in the Hills compare to the USA average?
Data Sources & Methodology
Water quality data for Lake in the Hills is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.
Water Hardness
Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.
pH
Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.
TDS — Total Dissolved Solids
Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.
PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances
EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.
Lead
Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.
Appliance Lifespan
Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.