Lake Marion
Lake Marion in Sumter County, South Carolina is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 117 acres.
- Area
- 117 acres
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Why Lake Marion has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Lake Marion, no water-quality sampling on record for this lake.
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by SCDES and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Lake Marion is a 117-acre lake in Sumter County, South Carolina.
Source: EPA Water Quality Portal sampling records, SCDES, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Lake Marion water quality
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Swimming Safety
Not ratedElevated nutrients
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Lake Marion
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Trophic State Index: undefined.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) |
Where to stay near Lake Marion
Compare lakeside cabins, hotels, and vacation rentals near Lake Marion in Sumter County, South Carolina — 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.
Top-rated places to stay near Lake Marion
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 117 acres |
No bathymetric survey has been published for Lake Marion, so its depth is not documented here.
Fishing Lake Marion
Nearby Lakes in Sumter County
Frequently asked questions about Lake Marion
Where is Lake Marion?
- Lake Marion is a lake in Sumter County, South Carolina. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Lake Marion?
- Lake Marion in Sumter County, South Carolina is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 117 acres.
Is Lake Marion safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Lake Marion is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Lake Marion across LakeQuality
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Where this data comes from
Measurements for Lake Marion come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.