Lake Mills
Seminole County, FloridaMesotrophic
Lake Mills is a mesotrophic lake in Seminole County, Florida. Water quality is graded B based on 2 sampling years through 2025. Compared to the 167 other monitored lakes in Seminole County, Lake Mills ranks #51 for water quality.
Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2025-06-10. Grade methodology: LakeGrade methodology.
Watch Lake Mills 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 6.4 ft. Phosphorus level: 22 µg/L. Trophic State Index: 50.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.4 ft | C |
| Phosphorus | 22 µg/L | B |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 50 | Mesotrophic |
Moderate nutrients, good water quality
Location
County Ranking
Ranked #51 of 168 lakes in Seminole County
Cleaner Lakes Within 30 Miles
Lake Mills holds Grade B. 2 nearby lakes hold higher grades.
- BKiwanis Lake South of CenterSeminole County · 1 mi · Higher overall water quality score
- BSeminole-Crescent LakeSeminole County · 1.5 mi · Higher overall water quality score
Nearby Lakes in Seminole 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
Marion County · Clarity: 7 ft
Hillsborough County · Clarity: 6 ft
Walton County · Clarity: 4 ft
Mesotrophic Lakes in Florida
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Data Sources
Water quality data from the EPA Water Quality Portal
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2025-06-10
Monitoring stations: 1
Where to stay near Lake Mills
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