Lake Avalon
Collier County, FloridaMesotrophic
Lake Avalon is a mesotrophic lake in Collier County, Florida. Water quality is graded B based on 2 sampling years through 2023. Compared to the 23 other monitored lakes in Collier County, Lake Avalon ranks #10 for water quality.
Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2023-09-14. Grade methodology: LakeGrade methodology.
Watch Lake Avalon water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Murky, only visible to about 6.6 ft. Phosphorus level: 12 µg/L. Trophic State Index: 45.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.6 ft | C |
| Phosphorus | 12 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 45 | Mesotrophic |
Moderate nutrients, good water quality
Location
County Ranking
Ranked #10 of 24 lakes in Collier County
Cleaner Lakes Within 30 Miles
Lake Avalon holds Grade B. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Collier County
More Florida Lake Rankings
Other Grade B Lakes in Florida
Bay County · Clarity: 4 ft
Brevard County · Clarity: 9.8 ft
Alachua County · Clarity: 5.5 ft
Seminole County · Clarity: 5 ft
Marion County · Clarity: 7 ft
Hillsborough County · Clarity: 6 ft
Mesotrophic Lakes in Florida
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Lake Avalon under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger. 1 facility has a reported Clean Water Act violation in the past three years.
- City Of Naples Water Reclamation FacilityNaples · 3.1 mi away · NPDES FL0026271MajorRecent violation
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Data Sources
Water quality data from the EPA Water Quality Portal
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2023-09-14
Monitoring stations: 1
Where to stay near Lake Avalon
Compare lakeside cabins, hotels, and vacation rentals near Lake Avalon in Collier County, Florida — live availability and prices for your trip.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.