Lake Diane Outfall
Lake Diane Outfall in Pinellas County, Florida has a water quality grade of D (Nutrient-rich). Phosphorus: 190 µg/L.
- Type
- Hypereutrophic
- Public access
- Yes
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Lake Diane Outfall →
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Lake Diane Outfall is a highly nutrient-loaded hypereutrophic lake in Pinellas County, Florida. Water quality is graded D based on 1 sampling years through 2023. Limited fish-species data available. Public access is available with 2 public boat landings. Compared to the 33 other monitored lakes in Pinellas County, Lake Diane Outfall ranks #34 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2023-09-21. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyBacteria advisory
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: 190 µg/L. Trophic State Index: 80.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 190 µg/L | Poor |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 80 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Lake Diane Outfall
Compare lakeside cabins, hotels, and vacation rentals near Lake Diane Outfall in Pinellas 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 Lake Diane Outfall are listed below.
Top-rated places to stay near Lake Diane Outfall
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Planning a whole trip? See where to stay at Florida’s top lakes →
Recreation & Access
- Dunedin Municipal MarinaPublic
- Clearwater Beach Public Boat RampPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Lake Diane Outfall
EPA Impairment Status
Lake Diane Outfall 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 FL1567B · Official waterbody report · Matched by proximity (1.29 km)
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Lake Diane Outfall 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.
- Clearwater City Of Marshall Street WrfClearwater · 1.2 mi away · NPDES FL0021857MajorRecent 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.
County Ranking
Ranked #34 of 34 lakes in Pinellas County
Nearby Lakes With Higher Grades
Lake Diane Outfall holds Grade D. 2 nearby lakes hold higher nutrient-and-algae grades — useful for a swim day, not a reason to skip lodging here.
Nearby Lakes in Pinellas County
Frequently asked questions about Lake Diane Outfall
Where is Lake Diane Outfall?
- Lake Diane Outfall is a lake in Pinellas County, Florida. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lake Diane Outfall?
- Lake Diane Outfall in Pinellas County, Florida has a water quality grade of D (Nutrient-rich). Phosphorus: 190 µg/L.
Is Lake Diane Outfall safe to swim in?
- Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum. Lake Diane Outfall has a water quality grade of D (Nutrient-rich). Always check local health department advisories before swimming.
Are there boat ramps on Lake Diane Outfall?
- Lake Diane Outfall has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Dunedin Municipal Marina, Clearwater Beach Public Boat Ramp. Public access is listed as yes.
Explore Lake Diane Outfall across LakeQuality
More Florida Lake Rankings
Other Grade D Lakes in Florida
Pasco County · 1 ft
Hillsborough County · 2.4 ft
Hillsborough County · 2.5 ft
Hillsborough County · Nutrient-rich
Hillsborough County · 2.5 ft
Hillsborough County · Nutrient-rich
Hypereutrophic Lakes in Florida
Where this data comes from
8 measurements from 1 monitoring station, 2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples8 samples · 2023
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Named boat-access points from the USGS National Boat Ramps inventory