Lake Killarney
McHenry County, Illinois60 acresView mapDirections
No nutrient or algae sampling on record from Illinois EPA for this lake.
- Impaired · Nutrients (phosphorus, nitrogen)
- 22 ft max depth
Lake Killarney in McHenry County, Illinois has water-quality measurements published by Illinois EPA, shown here as reported. Maximum depth: 22 ft. Surface area: 60 acres.
Lake Killarney is a 60-acre lake in McHenry County, Illinois with a maximum depth of 22 feet (4-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 Killarney is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Lake Killarney 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 Killarney
These are the measurements Illinois EPA publishes for Lake Killarney, 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 Killarney
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
22 ft
Average depth
4 ft
Surface area
60 acres
Shoreline
1.7 mi
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Stays near Lake Killarney
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Fishing Lake Killarney
EPA Impairment Status
Lake Killarney 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: Other.
Source: EPA ATTAINS assessment unit IL_RTZV · Official waterbody report
Nearby Lakes in McHenry County
Frequently asked questions about Lake Killarney
Where is Lake Killarney?
- Lake Killarney 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 Killarney?
- Lake Killarney in McHenry County, Illinois has water-quality measurements published by Illinois EPA, shown here as reported. Maximum depth: 22 ft. Surface area: 60 acres.
Is Lake Killarney safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Lake Killarney is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is Lake Killarney?
- Lake Killarney has a maximum depth of 22 feet and an average depth of 4 feet. The lake covers 60 acres.
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Where this data comes from
Measurements for Lake Killarney 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