Clear Lake A Stubbs Island
Lake County, CaliforniaView mapDirections
No nutrient or algae sampling on record from SWRCB for this lake.
- Impaired · Biotoxins
- Limited data
Clear Lake A Stubbs Island in Lake County, California has water-quality measurements published by SWRCB, shown here as reported.
Clear Lake A Stubbs Island is a lake in Lake County, California.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2023-04-10. Methodology: how these readings are compared.
Swimming conditions
No readingBacteria advisory
Nutrient and algae readings are not a swimming clearance. Clear Lake A Stubbs Island is listed impaired under Clean Water Act §303(d) (IR 5) for biotoxins, mercury, metals (other than mercury), oxygen depletion (low DO), pH / acidity. Check local advisories before you swim.
Whether Clear Lake A Stubbs Island is safe to swim in today is a call for the California State Water Resources Control Board and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Clear Lake A Stubbs Island
These are the measurements SWRCB publishes for Clear Lake A Stubbs Island, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data.
Ask about Clear Lake A Stubbs Island
Answers come straight from the public measurements and survey records on this page.
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Stays near Clear Lake A Stubbs Island
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Fishing Clear Lake A Stubbs Island
EPA Impairment Status
Clear Lake A Stubbs Island 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: Drinking water, Aquatic life, Fish consumption, Recreation.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit CAL5135200019980814115549 · Official waterbody report
Nearby Lakes in Lake County
Frequently asked questions about Clear Lake A Stubbs Island
Where is Clear Lake A Stubbs Island?
- Clear Lake A Stubbs Island is a lake in Lake County, California. Its water-quality measurements are published by SWRCB and shown on this page as reported.
What is the water quality of Clear Lake A Stubbs Island?
- Clear Lake A Stubbs Island in Lake County, California has water-quality measurements published by SWRCB, shown here as reported.
Is Clear Lake A Stubbs Island safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Clear Lake A Stubbs Island is listed impaired under Clean Water Act §303(d) (IR 5) for biotoxins, mercury, metals (other than mercury), oxygen depletion (low DO), pH / acidity. Check local advisories before you swim.
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Where this data comes from
1 measurement from 1 monitoring station, 2023. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- USGS California Water Science Center
USGS-CA1 sample · 2023
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database