
Kitsap County Lake Quality
Washington, 12 lakes — no lake here has enough monitoring data for a grade
Kitsap County holds 12 monitored lakes. With a sample that small the county-level summary describes those specific waters, not necessarily every water body in the county. No lake in Kitsap County has enough sampling behind it for an A–F grade yet. The 12 monitored lakes below carry whatever clarity, phosphorus, and chlorophyll-a measurements exist.
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.
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Quick Answers for Kitsap County
Planning a trip? Check special fishing regulations for Horseshoe Lake — or check the official Washington fishing regulations.
All Lakes in Kitsap County
12 lakes · 0 graded, 12 not rated0 graded lakes · 12 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| NRHorseshoe LakeKitsap | NR | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRLong LakeKitsap | NR | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRLittle Clam BayKitsap | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRKitsap LakeKitsap | NR | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRIsland LakeKitsap | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRWildcat LakeKitsap | NR | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRHintzville Beaver PondsKitsap | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRPanther LakeKitsap | NR | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRMission LakeKitsap | NR | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRTahuya LakeKitsap | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRUnion River ReservoirKitsap | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRWye LakeKitsap | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded |
NR = not rated: there is not enough recent sampling to support a letter. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.
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Other Counties in Washington
See how Kitsap County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..
Source: EPA National Aquatic Resource Surveys, 2026.