Clear Lake A Mooring la
Lake County, CaliforniaView mapDirections
SWRCB publishes the water-quality measurements for Clear Lake A Mooring la. Here is what has been measured.
- Impaired · Biotoxins
- Limited data
Clear Lake A Mooring la in Lake County, California has water-quality measurements published by SWRCB, shown here as reported. Phosphorus: 165.5 µg/L. Chlorophyll-a (algae): 14 µg/L.
Clear Lake A Mooring la is a lake in Lake County, California.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2023-09-20. Methodology: how these readings are compared.
Swimming conditions
No readingBacteria advisory
Nutrient and algae readings are not a swimming clearance. Clear Lake A Mooring la 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 Mooring la 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 Mooring la
These are the measurements SWRCB publishes for Clear Lake A Mooring la, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 165.5 µg/L. Chlorophyll-a 14 µg/L. TSI 67.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 166µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 14µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 67 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Clear Lake A Mooring la
Answers come straight from the public measurements and survey records on this page.
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Fishing Clear Lake A Mooring la
EPA Impairment Status
Clear Lake A Mooring la 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 Mooring la
Where is Clear Lake A Mooring la?
- Clear Lake A Mooring la 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 Mooring la?
- Clear Lake A Mooring la in Lake County, California has water-quality measurements published by SWRCB, shown here as reported. Phosphorus: 165.5 µg/L. Chlorophyll-a (algae): 14 µg/L.
Is Clear Lake A Mooring la safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Clear Lake A Mooring la 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
40 measurements from 3 monitoring stations, 2020–2023. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- USGS California Water Science Center
USGS-CA40 samples · 2020–2023
Analytical methods
- P, wu, WCA, persulfate CF color
- Plant pigments, sonication & 445
- YSI Environmental, sensor 6136
Monitoring station identifiers (3)
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