Clear Lake A Sulphur Bank Mine
Clear Lake A Sulphur Bank Mine in Lake County, California is not rated for water quality — its monitoring record does not meet the evidence bar. Chlorophyll-a (algae): 73.6 µg/L.
Why Clear Lake A Sulphur Bank Mine has no grade
We grade a lake only when its monitoring record clears the evidence bar: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Clear Lake A Sulphur Bank Mine, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded algae (chlorophyll-a), but not water clarity and phosphorus.
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by your state environmental agency and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Clear Lake A Sulphur Bank Mine is a lake in Lake County, California.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2023-05-02. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Clear Lake A Sulphur Bank Mine
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data. Chlorophyll-a: 73.6 µg/L. Trophic State Index: 73.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 73.6 µg/L | Not graded |
| Trophic State Index (TSI) | 73 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Clear Lake A Sulphur Bank Mine
Compare lakeside cabins, hotels, and vacation rentals near Clear Lake A Sulphur Bank Mine in Lake County, California — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
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Fishing Clear Lake A Sulphur Bank Mine
Graded lakes near Clear Lake A Sulphur Bank Mine
Clear Lake A Sulphur Bank Mine has no grade, but these lakes within a short drive do.
Nearby Lakes in Lake County
Frequently asked questions about Clear Lake A Sulphur Bank Mine
Where is Clear Lake A Sulphur Bank Mine?
- Clear Lake A Sulphur Bank Mine is a lake in Lake County, California. LakeQuality has not rated this lake (UNRATED) — there is not enough recent sampling to assign a letter.
What is the water quality grade for Clear Lake A Sulphur Bank Mine?
- Clear Lake A Sulphur Bank Mine in Lake County, California is not rated for water quality — its monitoring record does not meet the evidence bar. Chlorophyll-a (algae): 73.6 µg/L.
Is Clear Lake A Sulphur Bank Mine safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Clear Lake A Sulphur Bank Mine is not rated for water quality — its monitoring record does not meet the evidence bar. Algae concentration (chlorophyll-a) is 73.6 µg/L. Always check local health department advisories before swimming.
Explore Clear Lake A Sulphur Bank Mine across LakeGrade
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Where this data comes from
4 measurements from 1 monitoring station, 2022–2023. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- USGS California Water Science Center
USGS-CA4 samples · 2022–2023
Analytical methods
- P, wu, WCA, persulfate CF color
- Plant pigments, sonication & 445
- YSI Environmental, sensor 6136
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.