Lakemartha
Polk County, FloridaMesotrophic
Lakemartha is a mesotrophic lake in Polk County, Florida. Water quality is graded B based on 2 sampling years through 2022. Compared to the 360 other monitored lakes in Polk County, Lakemartha ranks #67 for water quality.
Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2022-09-20. Grade methodology: LakeGrade methodology.
Watch Lakemartha water quality
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Murky, only visible to about 5.2 ft. Phosphorus level: 18 µg/L. Trophic State Index: 50.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.2 ft | C |
| Phosphorus | 18 µg/L | B |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 50 | Mesotrophic |
Moderate nutrients, good water quality
Location
County Ranking
Ranked #67 of 361 lakes in Polk County
Cleaner Lakes Within 30 Miles
Lakemartha holds Grade B. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Polk County
More Florida Lake Rankings
Other Grade B Lakes in Florida
Bay County · Clarity: 4 ft
Brevard County · Clarity: 9.8 ft
Alachua County · Clarity: 5.5 ft
Seminole County · Clarity: 5 ft
Marion County · Clarity: 7 ft
Hillsborough County · Clarity: 6 ft
Mesotrophic 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 Lakemartha under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger.
- Polk City, City OfPolk City · 0.2 mi away · NPDES FLS266752Major
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: 2022-09-20
Monitoring stations: 1
Where to stay near Lakemartha
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