Thornhill Lake
Thornhill Lake in Volusia County, Florida is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 161 acres.
- Area
- 161 acres
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Why Thornhill Lake 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 Thornhill Lake, 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 FDEP and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Thornhill Lake is a 161-acre lake in Volusia County, Florida.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled recent years. Grade methodology: LakeQuality methodology.
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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 Thornhill Lake
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 Thornhill Lake
Compare lakeside cabins, hotels, and vacation rentals near Thornhill Lake in Volusia County, Florida — 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 Thornhill Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 161 acres |
No bathymetric survey has been published for Thornhill Lake, so its depth is not documented here.
Fishing Thornhill Lake
Nearby Lakes in Volusia County
Frequently asked questions about Thornhill Lake
Where is Thornhill Lake?
- Thornhill Lake is a lake in Volusia County, Florida. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Thornhill Lake?
- Thornhill Lake in Volusia County, Florida is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 161 acres.
Is Thornhill Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Thornhill Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
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Where this data comes from
Measurements for Thornhill Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.