Plumas County Lake Quality
California, 1 lake, average grade A (Excellent)
Only 1 lakes in Plumas County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. On average, Plumas County lakes grade an A. That puts it near the top of the California county ranking.
Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Lake Almanor (A) is the cleanest in the county.
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Quick Answers for Plumas County
Planning a trip? Check special fishing regulations for Lake Almanor — or check the official California fishing regulations.
All Lakes in Plumas County
1 lake1 graded lake
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | ALake AlmanorPlumas | A | No recent samples | 5 µg/L | 1.4 µg/L | No recent samples | Not recorded |
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Other Counties in California
See how Plumas County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 49 states and 2 Canadian provinces.
Source: EPA National Aquatic Resource Surveys, 2026.