St John'S Lake
St John'S Lake in Volusia County, Florida has a water quality grade of D (Nutrient-rich). Phosphorus: 102 µg/L.
- Typical in July
- 88°F
- Type
- Hypereutrophic
- Trend
- ↓ Declining
- Public access
- Yes
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near St John'S Lake →
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St John'S Lake is a highly nutrient-loaded hypereutrophic lake in Volusia County, Florida. Water quality is graded D based on 1 sampling years through 2024. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 29 other monitored lakes in Volusia County, St John'S Lake ranks #30 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2024-12-02. 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)
No clarity data. Phosphorus level: 102 µg/L. Trophic State Index: 71.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 102 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 St John'S Lake
Compare lakeside cabins, hotels, and vacation rentals near St John'S 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. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around St John'S Lake are listed below.
Top-rated places to stay near St John'S 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
St John'S Lake typically sits around 88°F at the surface in July. Summer average is about 86°F. Usually warmest in Jul (about 88°F) and coldest in Jan (about 62°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 50 field readings (2010–2025) via the EPA Water Quality Portal. See the full St John'S Lake water temperature breakdown →
Recreation & Access
- Cameron Wight Park Boat RampPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing St John'S Lake
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | 0 m/yr | 4 |
| Phosphorus | ↓ Declining | +6.85 µg/L/yr | 5 |
EPA Impairment Status
St John'S Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit FL2981A · Official waterbody report · Matched by proximity (0.43 km)
County Ranking
Ranked #30 of 30 lakes in Volusia County
Nearby Lakes With Higher Grades
St John'S Lake holds Grade D. 2 nearby lakes hold higher nutrient-and-algae grades — useful for a swim day, not a reason to skip lodging here.
See full comparison →Nearby Lakes in Volusia County
Frequently asked questions about St John'S Lake
Where is St John'S Lake?
- St John'S Lake is a lake in Volusia County, Florida. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for St John'S Lake?
- St John'S Lake in Volusia County, Florida has a water quality grade of D (Nutrient-rich). Phosphorus: 102 µg/L.
Is St John'S 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. St John'S Lake has a water quality grade of D (Nutrient-rich). Always check local health department advisories before swimming.
What is the water temperature of St John'S Lake?
- St John'S Lake typically sits around 88°F at the surface in July, from 50 EPA Water Quality Portal field readings (2010–2025). That is a typical value for the month, not a live reading.
Are there boat ramps on St John'S Lake?
- St John'S Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Cameron Wight Park Boat Ramp. Public access is listed as yes.
Explore St John'S Lake across LakeQuality
Planning a trip around Canaveral?
St John'S Lake is about 26 miles from Canaveral National Seashore. 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 Canaveral →More Florida Lake Rankings
Other Grade D Lakes in Florida
Hypereutrophic Lakes in Florida
Where this data comes from
19 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 samples19 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
Named boat-access points from the USGS National Boat Ramps inventory