Hernando-Mountain Lake
Hernando-Mountain Lake in Hernando County, Florida has a water quality grade of D (Nutrient-rich). Water clarity: 2.3 ft visibility. Phosphorus: 163 µg/L.
- Clarity
- 2.3 ft
- Type
- Hypereutrophic
- Trend
- ↑ Improving
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Hernando-Mountain Lake →
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Hernando-Mountain Lake is a highly nutrient-loaded hypereutrophic lake in Hernando County, Florida. Water quality is graded D based on 1 sampling years through 2025. Overall water quality is improving over recent sampling years. Compared to the 8 other monitored lakes in Hernando County, Hernando-Mountain Lake ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-01-28. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyElevated nutrients
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum
Water Quality Grade: D (Nutrient-rich)
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 | Not graded |
| Phosphorus | 163 µg/L | Poor |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 71 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Hernando-Mountain Lake
Compare lakeside cabins, hotels, and vacation rentals near Hernando-Mountain Lake in Hernando County, Florida — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Hernando-Mountain Lake are listed below.
Top-rated places to stay near Hernando-Mountain Lake
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Planning a whole trip? See where to stay at Florida’s top lakes →
Fishing Hernando-Mountain Lake
Water Quality Trend: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.163 m/yr | 6 |
| Phosphorus | → Stable | +1.84 µg/L/yr | 6 |
EPA Impairment Status
Hernando-Mountain Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit FL1329Y · Official waterbody report · Matched by proximity (0.08 km)
County Ranking
Ranked #6 of 9 lakes in Hernando County
Nearby Lakes in Hernando County
Frequently asked questions about Hernando-Mountain Lake
Where is Hernando-Mountain Lake?
- Hernando-Mountain Lake is a lake in Hernando County, Florida. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Hernando-Mountain Lake?
- Hernando-Mountain Lake in Hernando County, Florida has a water quality grade of D (Nutrient-rich). Water clarity: 2.3 ft visibility. Phosphorus: 163 µg/L.
Is Hernando-Mountain Lake safe to swim in?
- Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum. Hernando-Mountain Lake has a water quality grade of D (Nutrient-rich). Always check local health department advisories before swimming.
Explore Hernando-Mountain Lake across LakeQuality
More Florida Lake Rankings
Other Grade D Lakes in Florida
Pasco County · 2 ft
Hillsborough County · 1.8 ft
Hillsborough County · 2.5 ft
Hillsborough County · 2.5 ft
Hillsborough County · 1.3 ft
Hillsborough County · 1.5 ft
Hypereutrophic Lakes in Florida
Where this data comes from
108 measurements from 3 monitoring stations, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FLORIDA LAKEWATCH
21FLKWAT_WQX108 samples · 2020–2025
Monitoring station identifiers (3)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database