Irvin Lake
Irvin Lake in Hernando County, Florida has a water quality grade of D (Nutrient-rich). Water clarity: 1.3 ft visibility. Phosphorus: 180 µg/L.
- Clarity
- 1.3 ft
- Typical in August
- 88°F
- Type
- Hypereutrophic
- Trend
- → Stable
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Irvin Lake →
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Irvin Lake is a highly nutrient-loaded hypereutrophic lake in Hernando County, Florida. Water quality is graded D based on 1 sampling years through 2024. Water clarity is improving over recent sampling years. Compared to the 8 other monitored lakes in Hernando County, Irvin Lake ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2024-08-19. 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 1.3 ft of visibility. Phosphorus level: 180 µg/L. Trophic State Index: 76.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.3 ft | Not graded |
| Phosphorus | 180 µg/L | Poor |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 76 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Irvin Lake
Compare lakeside cabins, hotels, and vacation rentals near Irvin 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 Irvin Lake are listed below.
Top-rated places to stay near Irvin Lake
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Planning a whole trip? See where to stay at Florida’s top lakes →
Water Temperature
Irvin Lake typically sits around 88°F at the surface in August. Summer average is about 86°F. Usually warmest in Aug (about 88°F) and coldest in Jan (about 61°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 91 field readings (2010–2024) via the EPA Water Quality Portal. See the full Irvin Lake water temperature breakdown →
Fishing Irvin Lake
Water Quality Trend: → Stable
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.05 m/yr | 4 |
| Phosphorus | ↓ Declining | +50 µg/L/yr | 4 |
EPA Impairment Status
Irvin 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 FL1329M · Official waterbody report
County Ranking
Ranked #5 of 9 lakes in Hernando County
Nearby Lakes in Hernando County
Frequently asked questions about Irvin Lake
Where is Irvin Lake?
- Irvin 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 Irvin Lake?
- Irvin Lake in Hernando County, Florida has a water quality grade of D (Nutrient-rich). Water clarity: 1.3 ft visibility. Phosphorus: 180 µg/L.
Is Irvin 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. Irvin Lake has a water quality grade of D (Nutrient-rich). Always check local health department advisories before swimming.
What is the water temperature of Irvin Lake?
- Irvin Lake typically sits around 88°F at the surface in August, from 91 EPA Water Quality Portal field readings (2010–2024). That is a typical value for the month, not a live reading.
Explore Irvin Lake across LakeQuality
More Florida Lake Rankings
Other Grade D Lakes in Florida
Hypereutrophic Lakes in Florida
Where this data comes from
47 measurements from 1 monitoring station, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples47 samples · 2020–2024
Monitoring station identifiers (1)
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