Washington County Lake Quality
Mississippi, 3 lakes, average grade F (Algae-prone)
Washington County has 3 graded lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. The county average is F — the most-stressed bracket in our rubric. Most monitored lakes here show persistent nutrient loading and algal pressure.
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 Ferguson (F) is the cleanest in the county.
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Quick Answers for Washington County
Planning a trip? Check special fishing regulations for Lake Ferguson — or check the official Mississippi fishing regulations.
All Lakes in Washington County
3 lakes3 graded lakes
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | FLake FergusonWashington | F | 2.5 ft | 170 µg/L | 41.7 µg/L | No recent samples | Not recorded |
| 2 | FLake JacksonWashington | F | 1.8 ft | 80 µg/L | 61.9 µg/L | No recent samples | Not recorded |
| 3 | FLake WashingtonWashington | F | 1.5 ft | 200 µg/L | 66 µg/L | No recent samples | Not recorded |
Lake Match
Which lake suits how you actually use one?
Six questions — swimming, fishing, quiet, cabins, drive time — and a shortlist of graded lakes that fit, with the water quality behind each one.
Other Counties in Mississippi
See how Washington 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.