Wilson Lake
Wilson Lake in Tehama County, California is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 50 µg/L.
Why Wilson Lake 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 Wilson Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded phosphorus, but not water clarity and algae (chlorophyll-a).
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.
Wilson Lake is a lake in Tehama County, California.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2021-06-17. 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 Wilson Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data. Phosphorus level: 50 µg/L. Trophic State Index: 61.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 50 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 61 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Wilson Lake
Compare lakeside cabins, hotels, and vacation rentals near Wilson Lake in Tehama 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 Wilson Lake
Nearby Lakes in Tehama County
Frequently asked questions about Wilson Lake
Where is Wilson Lake?
- Wilson Lake is a lake in Tehama 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 Wilson Lake?
- Wilson Lake in Tehama County, California is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 50 µg/L.
Is Wilson Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Wilson Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Wilson Lake across LakeGrade
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Where this data comes from
1 measurement from 1 monitoring station, 2021. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- California State Water Resources Control Board
CEDEN1 sample · 2021
Analytical methods
- SM 4500-P BE
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.