What is the water quality grade for Hernando-Mountain Lake?

Hernando-Mountain Lake in Hernando County, Florida received a water quality grade of F (Very Poor). Water clarity: 2.3 ft visibility. Phosphorus: 163 µg/L.

Is Hernando-Mountain Lake safe to swim in?

Avoid swimming, very poor water quality, potential algae toxins. Hernando-Mountain Lake has an overall water quality grade of F. Always check local health department advisories before swimming.

Hernando-Mountain Lake

Hernando County, FloridaHypereutrophic

Hernando-Mountain Lake is a highly nutrient-loaded hypereutrophic lake in Hernando County, Florida. Water quality is graded F based on 2 sampling years through 2025. Compared to the 22 other monitored lakes in Hernando County, Hernando-Mountain Lake ranks #20 for water quality.

Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2025-01-28. Grade methodology: LakeGrade methodology.

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Swimming Safety

Avoid swimming, very poor water quality, potential algae toxins

Water Quality Grade: F, Very Poor

Very murky, less than 2.3 ft of visibility. Phosphorus level: 163 µg/L. Trophic State Index: 71.

Metric	Value	Grade
Water Clarity (Secchi Depth)	2.3 ft	F
Phosphorus	163 µg/L	F
Chlorophyll-a (Algae)	No data
Trophic State Index (TSI)	71	Hypereutrophic

Very high nutrients, dense algae, poor clarity

Location

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County Ranking

Ranked #20 of 23 lakes in Hernando County

Cleaner Lakes Within 30 Miles

Hernando-Mountain Lake holds Grade F. 4 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Hernando County

Hernando-Sparkman Lake

Hernando County

Sparkman Lake @ Center

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 F Lakes in Florida

Polk-Little Bass Lake

Polk County · Clarity: 1.3 ft

Polk-Big Bass Lake

Polk County · Clarity: 1 ft

Alachua-Wauberg Lake

Alachua County · Clarity: 2.4 ft

Lake Roberta

Hillsborough County · Clarity: 1.3 ft

Volusia Lake George @ N of Center

Volusia County · Clarity: 2 ft

Lwc Lake

Brevard County · Clarity: 1.6 ft

Hypereutrophic Lakes in Florida

Polk-Little Bass Lake Alicetst Lake Polk-Big Bass Lake Lake Roberta

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Most recent sample: 2025-01-28

Monitoring stations: 3

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