What is the water quality grade for Seminole-Mills Lake?

Seminole-Mills Lake in Seminole County, Florida received a water quality grade of B (Good). Water clarity: 6.3 ft visibility. Phosphorus: 17 µg/L.

Is Seminole-Mills Lake safe to swim in?

Good for swimming, clear water with low algae levels. Seminole-Mills Lake has an overall water quality grade of B. Always check local health department advisories before swimming.

Seminole-Mills Lake

Seminole County, FloridaMesotrophic

Seminole-Mills Lake is a mesotrophic lake in Seminole County, Florida. Water quality is graded B based on 2 sampling years through 2022. Compared to the 167 other monitored lakes in Seminole County, Seminole-Mills Lake ranks #32 for water quality.

Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2022-08-17. Grade methodology: LakeGrade methodology.

Watch Seminole-Mills Lake water quality

Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.

Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Murky, only visible to about 6.3 ft. Phosphorus level: 17 µg/L. Trophic State Index: 48.

Metric	Value	Grade
Water Clarity (Secchi Depth)	6.3 ft	C
Phosphorus	17 µg/L	B
Chlorophyll-a (Algae)	No data
Trophic State Index (TSI)	48	Mesotrophic

Moderate nutrients, good water quality

Location

Loading map…

County Ranking

Ranked #32 of 168 lakes in Seminole County

Cleaner Lakes Within 30 Miles

Seminole-Mills Lake holds Grade B. 2 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Seminole County

Kiwanis Lake South of Center

Seminole County

Seminole-Horseshoe Lake

Seminole County

Horseshoe North Lake

Seminole County

More Florida Lake Rankings

Cleanest lakes in Florida

Top 25 by overall water quality score

Best swimming lakes in Florida

Grade A/B + low algae filter

Family fishing lakes in Florida

Panfish-rich, public access

All Florida lakes

Full state directory

Other Grade B Lakes in Florida

Bay-Deer Point Lake

Bay County · Clarity: 4 ft

Brevard-Clear Lake

Brevard County · Clarity: 9.8 ft

Alachua-Santa Fe Painter Canal Lake

Alachua County · Clarity: 5.5 ft

Marion-Deerback Lake

Marion County · Clarity: 7 ft

Hillsborough-Flynn Lake

Hillsborough County · Clarity: 6 ft

Western Lake Middle

Walton County · Clarity: 4 ft

Mesotrophic Lakes in Florida

Bay-Deer Point Lake Brevard-Clear Lake Marion-Deerback Lake Hillsborough-Flynn Lake

Lake Size & Watershed

Watershed (drainage) area

12 sq mi

Surface area

217 acres

Mean depth (est.)

10.2 ft

Shoreline

2.5 mi

Elevation

49 ft

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: 2022-08-17

Monitoring stations: 3

Where to stay near Seminole-Mills Lake

Compare lakeside cabins, hotels, and vacation rentals near Seminole-Mills Lake in Seminole 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.