Lag Lake
Lag Lake in Volusia County, Florida has a water quality grade of C (Fair). Water clarity: 2.3 ft visibility. Phosphorus: 43.1 µg/L.
- Clarity
- 2.3 ft
- Typical in August
- 84°F
- Type
- Eutrophic
- Trend
- → Stable
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Lag Lake is a productive, nutrient-rich eutrophic lake in Volusia County, Florida. Water quality is graded C based on 1 sampling years through 2025. Water clarity is declining over recent sampling years. Compared to the 29 other monitored lakes in Volusia County, Lag Lake ranks #19 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-01-22. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyModerate
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.
Generally safe for swimming, moderate water quality
Water Quality Grade: C (Fair)
Very murky, less than 2.3 ft of visibility. Phosphorus level: 43.1 µg/L. Trophic State Index: 62.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.3 ft | Not graded |
| Phosphorus | 43.1 µg/L | Fair |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 62 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lag Lake
Compare lakeside cabins, hotels, and vacation rentals near Lag Lake in Volusia 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 Lag Lake
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Planning a whole trip? See where to stay at Florida’s top lakes →
Water Temperature
Lag Lake typically sits around 84°F at the surface in August. Summer average is about 85°F. Usually warmest in Jun (about 85°F) and coldest in Dec (about 50°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 218 field readings (2010–2025) via the EPA Water Quality Portal. See the full Lag Lake water temperature breakdown →
Fishing Lag Lake
Water Quality Trend: → Stable
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.025 m/yr | 5 |
| Phosphorus | ↑ Improving | -9.28 µg/L/yr | 5 |
County Ranking
Ranked #19 of 30 lakes in Volusia County
Nearby Lakes in Volusia County
Frequently asked questions about Lag Lake
Where is Lag Lake?
- Lag Lake is a lake in Volusia County, Florida. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lag Lake?
- Lag Lake in Volusia County, Florida has a water quality grade of C (Fair). Water clarity: 2.3 ft visibility. Phosphorus: 43.1 µg/L.
Is Lag Lake safe to swim in?
- Generally safe for swimming, moderate water quality. Lag Lake has a water quality grade of C (Fair). Always check local health department advisories before swimming.
What is the water temperature of Lag Lake?
- Lag Lake typically sits around 84°F at the surface in August, from 218 EPA Water Quality Portal field readings (2010–2025). That is a typical value for the month, not a live reading.
Explore Lag Lake across LakeQuality
Planning a trip around Fort Matanzas?
Lag Lake is about 38 miles from Fort Matanzas National Monument. Crowds there swing hard by season, so the month you pick changes both how busy the park is and what lodging costs.
Best time to visit Fort Matanzas →More Florida Lake Rankings
Other Grade C Lakes in Florida
Eutrophic Lakes in Florida
Where this data comes from
150 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- St. Johns River Water Management District
21FLSJWM_WQX150 samples · 2020–2025
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.