Hillsborough-Nancy Lake
Hillsborough-Nancy Lake in Hillsborough County, Florida has a water quality grade of B (Good). Water clarity: 4.9 ft visibility. Phosphorus: 17 µg/L.
- Clarity
- 4.9 ft
- Type
- Mesotrophic
- Trend
- ↓ Declining
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Hillsborough-Nancy Lake is a mesotrophic lake in Hillsborough County, Florida. Water quality is graded B based on 1 sampling years through 2023. Overall water quality is declining over recent sampling years. Compared to the 123 other monitored lakes in Hillsborough County, Hillsborough-Nancy Lake ranks #26 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2023-08-27. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
Murky, only visible to about 4.9 ft. Phosphorus level: 17 µg/L. Trophic State Index: 50.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.9 ft | Not graded |
| Phosphorus | 17 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 50 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Hillsborough-Nancy Lake
Compare lakeside cabins, hotels, and vacation rentals near Hillsborough-Nancy 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.
Top-rated places to stay near Hillsborough-Nancy Lake
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Fishing Hillsborough-Nancy Lake
Water Quality Trend: ↓ Declining
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.696 m/yr | 4 |
| Phosphorus | ↓ Declining | +0.64 µg/L/yr | 4 |
EPA Impairment Status
Hillsborough-Nancy Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit FL1463D · Official waterbody report · Matched by proximity (0.7 km)
County Ranking
Ranked #26 of 124 lakes in Hillsborough County
Nearby Lakes in Hillsborough County
Frequently asked questions about Hillsborough-Nancy Lake
Where is Hillsborough-Nancy Lake?
- Hillsborough-Nancy Lake is a lake in Hillsborough County, Florida. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Hillsborough-Nancy Lake?
- Hillsborough-Nancy Lake in Hillsborough County, Florida has a water quality grade of B (Good). Water clarity: 4.9 ft visibility. Phosphorus: 17 µg/L.
Is Hillsborough-Nancy Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Hillsborough-Nancy Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
Explore Hillsborough-Nancy Lake across LakeQuality
More Florida Lake Rankings
Other Grade B Lakes in Florida
Mesotrophic Lakes in Florida
Where this data comes from
59 measurements from 3 monitoring stations, 2020–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FLORIDA LAKEWATCH
21FLKWAT_WQX59 samples · 2020–2023
Monitoring station identifiers (3)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database