Elem Colony Lake
Lake County, CaliforniaView mapDirections
No nutrient or algae sampling on record from SWRCB for this lake.
- Impaired · Biotoxins
- Limited data
Elem Colony Lake in Lake County, California has water-quality measurements published by SWRCB, shown here as reported.
Elem Colony Lake 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. Elem Colony Lake 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 Elem Colony Lake 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 Elem Colony Lake
These are the measurements SWRCB publishes for Elem Colony Lake, 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 Elem Colony Lake
Answers come straight from the public measurements and survey records on this page.
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Fishing Elem Colony Lake
EPA Impairment Status
Elem Colony Lake 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 Elem Colony Lake
Where is Elem Colony Lake?
- Elem Colony Lake 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 Elem Colony Lake?
- Elem Colony Lake in Lake County, California has water-quality measurements published by SWRCB, shown here as reported.
Is Elem Colony Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Elem Colony Lake 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
12 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_WQX12 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