Lake Grady
Hillsborough County, FloridaEutrophic
Lake Grady is a productive, nutrient-rich eutrophic lake in Hillsborough County, Florida. Water quality is graded F based on 2 sampling years through 2025. Compared to the 221 other monitored lakes in Hillsborough County, Lake Grady ranks #210 for water quality.
Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2025-07-15. Grade methodology: LakeGrade methodology.
Watch Lake Grady water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 2 ft of visibility. Phosphorus level: 110 µg/L. Trophic State Index: 70.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2 ft | F |
| Phosphorus | 110 µg/L | F |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 70 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Location
County Ranking
Ranked #210 of 222 lakes in Hillsborough County
Cleaner Lakes Within 30 Miles
Lake Grady holds Grade F. 2 nearby lakes hold higher grades.
- CHillsborough-MohrlakeHillsborough County · 5.9 mi · Two grade letters higher (F → C)
- CHillsborough-Hickory Hammock LakeHillsborough County · 5.3 mi · Two grade letters higher (F → C)
Nearby Lakes in Hillsborough County
More Florida Lake Rankings
Other Grade F Lakes in Florida
Polk County · Clarity: 1.3 ft
Polk County · Clarity: 1 ft
Alachua County · Clarity: 2.4 ft
Volusia County · Clarity: 2 ft
Brevard County · Clarity: 1.6 ft
Highlands County · Clarity: 1 ft
Eutrophic Lakes in Florida
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Lake Grady under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Rice Creek WwtfRiverview · 2.8 mi away · NPDES FL0122076Recent violation
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Data Sources
Water quality data from the EPA Water Quality Portal
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2025-07-15
Monitoring stations: 1
Where to stay near Lake Grady
Compare lakeside cabins, hotels, and vacation rentals near Lake Grady in Hillsborough County, Florida — live availability and prices for your trip.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.