Lake Iosco
Passaic County, New Jersey67 acresView mapDirections
No nutrient or algae sampling on record from NJDEP for this lake.
- Impaired · Metals (other than mercury)
- 10 ft max depth
Lake Iosco in Passaic County, New Jersey has water-quality measurements published by NJDEP, shown here as reported. Maximum depth: 9.8 ft. Surface area: 67 acres.
Lake Iosco is a 67-acre lake in Passaic County, New Jersey with a maximum depth of 10 feet.
Source: EPA Water Quality Portal sampling records, your state environmental agency. Methodology: how these readings are compared.
Swimming conditions
No readingBacteria advisory
Nutrient and algae readings are not a swimming clearance. Lake Iosco is listed impaired under Clean Water Act §303(d) (IR 5) for metals (other than mercury), nutrients (phosphorus, nitrogen), pathogens (E. coli, fecal), temperature. Check local advisories before you swim.
Whether Lake Iosco is safe to swim in today is a call for the New Jersey Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Lake Iosco
These are the measurements NJDEP publishes for Lake Iosco, 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 Iosco
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
9.8 ft
Surface area
67 acres
Shoreline
2.4 mi
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Fishing Lake Iosco
EPA Impairment Status
Lake Iosco is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Drinking water, Aquatic life, Recreation.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NJ02030103070070-01 · Official waterbody report
Nearby Lakes in Passaic County
Frequently asked questions about Lake Iosco
Where is Lake Iosco?
- Lake Iosco is a lake in Passaic County, New Jersey. Its water-quality measurements are published by NJDEP and shown on this page as reported.
What is the water quality of Lake Iosco?
- Lake Iosco in Passaic County, New Jersey has water-quality measurements published by NJDEP, shown here as reported. Maximum depth: 9.8 ft. Surface area: 67 acres.
Is Lake Iosco safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Lake Iosco is listed impaired under Clean Water Act §303(d) (IR 5) for metals (other than mercury), nutrients (phosphorus, nitrogen), pathogens (E. coli, fecal), temperature. Check local advisories before you swim.
How deep is Lake Iosco?
- Lake Iosco has a maximum depth of 9.8 feet. The lake covers 67 acres.
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Where this data comes from
Measurements for Lake Iosco 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