Hillsborough-Byrd Lake
Hillsborough-Byrd Lake in Hillsborough County, Florida has a water quality grade of B (Good). Water clarity: 4.5 ft visibility. Phosphorus: 25 µg/L.
- Clarity
- 4.5 ft
- Type
- Eutrophic
- Trend
- → Stable
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Hillsborough-Byrd Lake is a productive, nutrient-rich eutrophic lake in Hillsborough County, Florida. Water quality is graded B based on 1 sampling years through 2023. Water clarity is declining over recent sampling years. Compared to the 123 other monitored lakes in Hillsborough County, Hillsborough-Byrd Lake ranks #63 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2023-05-29. 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 4.5 ft. Phosphorus level: 25 µg/L. Trophic State Index: 53.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.5 ft | Not graded |
| Phosphorus | 25 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Hillsborough-Byrd Lake
Compare lakeside cabins, hotels, and vacation rentals near Hillsborough-Byrd 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-Byrd Lake
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Fishing Hillsborough-Byrd Lake
Water Quality Trend: → Stable
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.19 m/yr | 5 |
| Phosphorus | ↑ Improving | -0.8 µg/L/yr | 5 |
EPA Impairment Status
Hillsborough-Byrd 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 FL1516G · Official waterbody report · Matched by proximity (0.04 km)
County Ranking
Ranked #63 of 124 lakes in Hillsborough County
Nearby Lakes in Hillsborough County
Frequently asked questions about Hillsborough-Byrd Lake
Where is Hillsborough-Byrd Lake?
- Hillsborough-Byrd 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-Byrd Lake?
- Hillsborough-Byrd Lake in Hillsborough County, Florida has a water quality grade of B (Good). Water clarity: 4.5 ft visibility. Phosphorus: 25 µg/L.
Is Hillsborough-Byrd Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Hillsborough-Byrd Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
Explore Hillsborough-Byrd Lake across LakeQuality
More Florida Lake Rankings
Other Grade B Lakes in Florida
Eutrophic Lakes in Florida
Where this data comes from
78 measurements from 3 monitoring stations, 2022–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FLORIDA LAKEWATCH
21FLKWAT_WQX78 samples · 2022–2023
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