Clearlake Oaks
Lake County, CaliforniaView mapDirections
No nutrient or algae sampling on record from SWRCB for this lake.
- Impaired · Biotoxins
- Limited data
Clearlake Oaks in Lake County, California has water-quality measurements published by SWRCB, shown here as reported.
Clearlake Oaks is a lake in Lake County, California.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2020-08-18. Methodology: how these readings are compared.
Swimming conditions
No readingBacteria advisory
Nutrient and algae readings are not a swimming clearance. Clearlake Oaks 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 Clearlake Oaks 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 Clearlake Oaks
These are the measurements SWRCB publishes for Clearlake Oaks, 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 Clearlake Oaks
Answers come straight from the public measurements and survey records on this page.
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Fishing Clearlake Oaks
EPA Impairment Status
Clearlake Oaks 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 Clearlake Oaks
Where is Clearlake Oaks?
- Clearlake Oaks 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 Clearlake Oaks?
- Clearlake Oaks in Lake County, California has water-quality measurements published by SWRCB, shown here as reported.
Is Clearlake Oaks safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Clearlake Oaks 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
22 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- Elem Indian Colony (Tribal)
POMO989_WQX22 samples · 2020
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