South Waubay Lake
Day County, South Dakota2,335 acresView mapDirections
No nutrient or algae sampling on record from SD DANR for this lake.
- Impaired · Algal growth
- Limited data
South Waubay Lake in Day County, South Dakota has water-quality measurements published by SD DANR, shown here as reported. Surface area: 2335 acres.
South Waubay Lake is a 2,335-acre lake in Day County, South Dakota.
Source: EPA Water Quality Portal sampling records, SD DANR. Methodology: how these readings are compared.
What South Waubay Lake is good for
From access and monitoring records, not editorial picks.
- Big water2,335 acres
Swimming conditions
No readingRecreation use not supported
Nutrient and algae readings are not a swimming clearance. South Waubay Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, mercury. Check local advisories before you swim.
Whether South Waubay Lake is safe to swim in today is a call for the South Dakota Department of Agriculture and Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for South Waubay Lake
These are the measurements SD DANR publishes for South Waubay Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data.
Ask about South Waubay Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
2,335 acres
Shoreline
14.8 mi
No bathymetric survey has been published for South Waubay Lake, so its depth is not documented here.
Stays via Stay22
Stays near South Waubay Lake
Compare lakeside cabins, hotels, and vacation rentals near South Waubay Lake in Day County, South Dakota — 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.
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Fishing South Waubay Lake
EPA Impairment Status
South Waubay Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Aquatic life, Recreation.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit SD-BS-L-WAUBAY_01 · Official waterbody report
Nearby Lakes in Day County
Frequently asked questions about South Waubay Lake
Where is South Waubay Lake?
- South Waubay Lake is a lake in Day County, South Dakota. Its water-quality measurements are published by SD DANR and shown on this page as reported.
What is the water quality of South Waubay Lake?
- South Waubay Lake in Day County, South Dakota has water-quality measurements published by SD DANR, shown here as reported. Surface area: 2335 acres.
Is South Waubay Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. South Waubay Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, mercury. Check local advisories before you swim.
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Where this data comes from
Measurements for South Waubay Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database