Tank Lake
Tank Lake in Hernando County, Florida is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 5.1 ft visibility. Phosphorus: 18 µg/L.
- Clarity
- 5.1 ft
- Typical in August
- 89°F
- Trend
- ↓ Declining
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Why Tank Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Tank Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity and phosphorus, but not algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by FDEP and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Tank Lake is a lake in Hernando County, Florida. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2021-06-28. Grade methodology: LakeQuality methodology.
Watch Tank Lake water quality
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Tank Lake
These readings exist but are not enough for an A–F grade — see why.
Murky, only visible to about 5.1 ft. Phosphorus level: 18 µg/L. Trophic State Index: 50.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.1 ft | Not graded |
| Phosphorus | 18 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 50 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Tank Lake
Compare lakeside cabins, hotels, and vacation rentals near Tank 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.
Top-rated places to stay near Tank Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Florida’s top lakes →
Water Temperature
Tank Lake typically sits around 89°F at the surface in August. Summer average is about 88°F. Usually warmest in Aug (about 89°F) and coldest in Feb (about 60°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 51 field readings (2010–2021) via the EPA Water Quality Portal. See the full Tank Lake water temperature breakdown →
Fishing Tank Lake
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.7 m/yr | 2 |
| Phosphorus | ↓ Declining | +2 µg/L/yr | 2 |
EPA Impairment Status
Tank 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 FL1329L · Official waterbody report
Graded lakes near Tank Lake
Tank Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Hernando County
Frequently asked questions about Tank Lake
Where is Tank Lake?
- Tank Lake is a lake in Hernando County, Florida. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Tank Lake?
- Tank Lake in Hernando County, Florida is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 5.1 ft visibility. Phosphorus: 18 µg/L.
Is Tank Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Tank Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
What is the water temperature of Tank Lake?
- Tank Lake typically sits around 89°F at the surface in August, from 51 EPA Water Quality Portal field readings (2010–2021). That is a typical value for the month, not a live reading.
Explore Tank Lake across LakeQuality
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Where this data comes from
4 measurements from 1 monitoring station, 2020–2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples4 samples · 2020–2021
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