Seminole County Lake Quality
Oklahoma, 3 lakes, average grade D (Nutrient-rich)
Seminole County holds 3 monitored lakes. With a sample that small the county-level summary describes those specific waters, not necessarily every water body in the county. Every one of those lakes carries an A–F grade, so the county-level summary covers the full set rather than a monitored subset. The county-wide average grade is D — water quality issues are persistent across most of the monitored basins. 0 lakes fall into the F bracket outright.
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 Konawa (D) is the cleanest in the county.
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Quick Answers for Seminole County
Planning a trip? Check special fishing regulations for Lake Konawa — or check the official Oklahoma fishing regulations.
All Lakes in Seminole County
3 lakes3 graded lakes
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | DLake KonawaSeminole | D | 3.1 ft | 50 µg/L | No recent samples | No recent samples | Not recorded |
| 2 | DSportsman LakeSeminole | D | 6.2 ft | 50 µg/L | No recent samples | No recent samples | Not recorded |
| 3 | DWewoka LakeSeminole | D | 2.5 ft | 55 µg/L | No recent samples | No recent samples | Not recorded |
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Other Counties in Oklahoma
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Source: EPA National Aquatic Resource Surveys, 2026.