Lake Washington
Washington County, MississippiView mapDirections
MDEQ publishes the water-quality measurements for Lake Washington. Here is what has been measured.
- Hypereutrophic
- Public access
- Limited data
Lake Washington in Washington County, Mississippi has water-quality measurements published by MDEQ, shown here as reported. Water clarity: 1.5 ft visibility. Phosphorus: 200 µg/L. Chlorophyll-a (algae): 66 µg/L.
Lake Washington is a highly nutrient-loaded hypereutrophic lake in Washington County, Mississippi. Limited fish-species data available. Public access is available. Compared to the 3 other monitored lakes in Washington County, Lake Washington ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2025-10-22. Methodology: how these readings are compared.
Swimming conditions
Readings onlyLimited data
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Lake Washington is safe to swim in today is a call for the Mississippi Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Lake Washington
These are the measurements MDEQ publishes for Lake Washington, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 1.5 ft of visibility. Phosphorus 200 µg/L. Chlorophyll-a 66 µg/L. TSI 75.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1.5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 200µg/L | Poor GoodFairPoor |
| Chlorophyll-a (algae) | 66µg/L | Poor GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 75 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
Ask about Lake Washington
Answers come straight from the public measurements and survey records on this page.
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Stays near Lake Washington
Compare lakeside cabins, hotels, and vacation rentals near Lake Washington in Washington County, Mississippi — 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. The water-quality readings cover nutrients and algae, not lodging. Cabins and rentals around Lake Washington are listed below.
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Fishing Lake Washington
Nearby Lakes in Washington County
Frequently asked questions about Lake Washington
Where is Lake Washington?
- Lake Washington is a lake in Washington County, Mississippi. Its water-quality measurements are published by MDEQ and shown on this page as reported.
What is the water quality of Lake Washington?
- Lake Washington in Washington County, Mississippi has water-quality measurements published by MDEQ, shown here as reported. Water clarity: 1.5 ft visibility. Phosphorus: 200 µg/L. Chlorophyll-a (algae): 66 µg/L.
Is Lake Washington safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Can I fish at Lake Washington?
- Public access to Lake Washington is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by Mississippi's fish and wildlife agency, so check its current regulations before you go.
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Where this data comes from
73 measurements from 2 monitoring stations, 2025. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- MISSISSIPPI DEPARTMENT OF ENVIRONMENTAL QUALITY
21MSWQ_WQX73 samples · 2025
Analytical methods
- Phosphorus by Colorimetry
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
Monitoring station identifiers (2)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.