Lake in the Hills
McHenry County, Illinois54 acresView mapDirections
No nutrient or algae sampling on record from Illinois EPA for this lake.
- Impaired · Nutrients (phosphorus, nitrogen)
- 26 ft max depth
Lake in the Hills in McHenry County, Illinois has water-quality measurements published by Illinois EPA, shown here as reported. Maximum depth: 26 ft. Surface area: 54 acres.
Lake in the Hills is a 54-acre lake in McHenry County, Illinois with a maximum depth of 26 feet (11-foot average).
Source: EPA Water Quality Portal sampling records, Illinois EPA. Methodology: how these readings are compared.
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Lake in the Hills is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen), pesticides, turbidity. Check local advisories before you swim.
Whether Lake in the Hills is safe to swim in today is a call for the Illinois Environmental Protection Agency and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Lake in the Hills
These are the measurements Illinois EPA publishes for Lake in the Hills, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. TSI undefined.
Ask about Lake in the Hills
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
26 ft
Average depth
11.3 ft
Surface area
54 acres
Shoreline
2 mi
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Stays near Lake in the Hills
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Fishing Lake in the Hills
EPA Impairment Status
Lake in the Hills is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Fish consumption, Other.
Source: EPA ATTAINS assessment unit IL_RTZZ · Official waterbody report
Nearby Lakes in McHenry County
Frequently asked questions about Lake in the Hills
Where is Lake in the Hills?
- Lake in the Hills is a lake in McHenry County, Illinois. Its water-quality measurements are published by Illinois EPA and shown on this page as reported.
What is the water quality of Lake in the Hills?
- Lake in the Hills in McHenry County, Illinois has water-quality measurements published by Illinois EPA, shown here as reported. Maximum depth: 26 ft. Surface area: 54 acres.
Is Lake in the Hills safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Lake in the Hills is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen), pesticides, turbidity. Check local advisories before you swim.
How deep is Lake in the Hills?
- Lake in the Hills has a maximum depth of 26 feet and an average depth of 11.3 feet. The lake covers 54 acres.
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Where this data comes from
Measurements for Lake in the Hills come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database