Hillsborough-Mystik Lake
Hillsborough County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Hillsborough-Mystik Lake. Here is what has been measured.
- Hypereutrophic
- Limited data
Hillsborough-Mystik Lake in Hillsborough County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 2.5 ft visibility. Phosphorus: 323.5 µg/L.
Hillsborough-Mystik Lake is a highly nutrient-loaded hypereutrophic lake in Hillsborough County, Florida. Overall water quality is declining over recent sampling years. Compared to the 123 other monitored lakes in Hillsborough County, Hillsborough-Mystik Lake ranks #98 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2022-04-29. 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 Hillsborough-Mystik Lake is safe to swim in today is a call for the Florida Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Hillsborough-Mystik Lake
These are the measurements Florida DEP publishes for Hillsborough-Mystik Lake, 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 2.5 ft of visibility. Phosphorus 323.5 µg/L. TSI 76.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 2.5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 324µg/L | Poor GoodFairPoor |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 76 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
Ask about Hillsborough-Mystik Lake
Answers come straight from the public measurements and survey records on this page.
Stays via Stay22
Stays near Hillsborough-Mystik Lake
Compare lakeside cabins, hotels, and vacation rentals near Hillsborough-Mystik Lake in Hillsborough 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. The water-quality readings cover nutrients and algae, not lodging. Cabins and rentals around Hillsborough-Mystik Lake are listed below.
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Fishing Hillsborough-Mystik Lake
Water Quality Trend: Worsening
Based on 5 years of monitoring (2020–2024).
Water clarity
Worsening5 years
Phosphorus
Worsening+2.55 µg/L/yr5 years
Nearby Lakes in Hillsborough County
Frequently asked questions about Hillsborough-Mystik Lake
Where is Hillsborough-Mystik Lake?
- Hillsborough-Mystik Lake is a lake in Hillsborough County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Hillsborough-Mystik Lake?
- Hillsborough-Mystik Lake in Hillsborough County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 2.5 ft visibility. Phosphorus: 323.5 µg/L.
Is Hillsborough-Mystik Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Hillsborough-Mystik Lake across LakeQuality
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Hypereutrophic Lakes in Florida
Where this data comes from
56 measurements from 3 monitoring stations, 2021–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FLORIDA LAKEWATCH
21FLKWAT_WQX56 samples · 2021–2022
Monitoring station identifiers (3)
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.