Cary Water Hardness & Quality Report (2026)
Water Hardness
180+ mg/L
Very Hardestimated · not lab-verified
Source
groundwater
pH Level
8
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
833 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 Cary, your appliances are currently losing 45% efficiency due to mineral buildup.
| Appliance | In Cary | 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 Cary compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Cary, Illinois | ≈ 180+ mg/L | 30.3 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 |
| Lake in the Hills, Illinois | ≈ 180+ mg/L | 0 ppt | 🔴 Very Hard | groundwater |
National Benchmark
How Cary compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Cary | ≈ 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 Cary's Water Unique?
Local geology and source profile
The Village of Cary water system (IL1110100) serves McHenry County, Illinois, providing drinking water to approximately 20,000 residents. The utility draws exclusively from local groundwater wells with no surface water inputs or named treatment plant specified in available reports. Superintendent of Utilities Matt Anderson can be reached at (847) 639-0003; the official village website is caryillinois.com. Annual Consumer Confidence Reports (CCRs) are published by the village and accessible via the official site, confirming compliance with state and federal safe drinking water regulations.
Cary's groundwater originates from the Fox River basin in northeastern Illinois, underlain by Paleozoic bedrock aquifers — primarily Silurian dolomite and limestone — interspersed with Pleistocene glacial till, sand, and gravel. These carbonate-rich formations impart a very hard character to the supply through mineral dissolution of calcium and magnesium. The geology fosters an elevated mineral profile without dilution effects from surface sources, consistent with broader Illinois groundwater traits influenced by ancient reef structures and glacial recharge.
Very hard water in Cary leads to significant scale buildup in pipes, water heaters, dishwashers, and washing machines, reducing efficiency and lifespan. White deposits on fixtures and spots on glassware are common. Regular deliming of appliances and cleaning of aerators is advised; a water softener is strongly recommended for all households. Standard groundwater disinfection treatment is applied. Iron, manganese, and zinc are monitored under Illinois state MCLs. Potential lead exposure is minimized by flushing taps per EPA guidance; specific pH, PFAS, and copper data should be requested directly from the utility.
Geology & Source: Fox River basin, McHenry County; Silurian dolomite and limestone (Paleozoic) overlain by Pleistocene glacial till and sand — carbonate dissolution yields very hard groundwater with no surface water dilution
Other Illinois Water Reports
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Frequently Asked Questions
Is Cary's water safe to drink?
Do I need a water softener in Cary?
How does Cary compare to the USA average?
Data Sources & Methodology
Water quality data for Cary 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.