Lake Mariana
Polk County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Lake Mariana. Here is what has been measured.
- Impaired · Algal growth
- Public access
- Limited data
Lake Mariana in Polk County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 2 ft visibility. Phosphorus: 32 µg/L.
Lake Mariana is a lake in Polk County, Florida. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2024-07-30. Methodology: how these readings are compared.
Lake Mariana has one public boat landing. For a place on the water, look through cabin and lake-house rentals near Lake Mariana on Vrbo. For a hotel or motel room, Booking.com and Expedia both search around the lake.
What Lake Mariana is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming conditions
No readingRecreation use not supported
Nutrient and algae readings are not a swimming clearance. Lake Mariana is listed impaired under Clean Water Act §303(d) (IR 4A) for algal growth, nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Lake Mariana is safe to swim in today is a call for the Florida Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Lake Mariana
These are the measurements Florida DEP publishes for Lake Mariana, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 2 ft of visibility. Phosphorus 32 µg/L. TSI 61.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 2ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 32µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 61 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Lake Mariana
Answers come straight from the public measurements and survey records on this page.
Recreation & Access
- Lake Mariana Public Boat RampPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Stays via Stay22
Stays near Lake Mariana
Compare lakeside cabins, hotels, and vacation rentals near Lake Mariana in Polk 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 Lake Mariana
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Fishing Lake Mariana
Water Quality Trend: Worsening
Based on 6 years of monitoring (2020–2025).
Water clarity
Worsening6 years
Phosphorus
Worsening+0.63 µg/L/yr6 years
EPA Impairment Status
Lake Mariana is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).
Causes of impairment
Designated uses not supporting: Aquatic life, Recreation.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit FL1521L · Official waterbody report
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Lake Mariana under Clean Water Act (NPDES) discharge permits.
- Ufp Auburndale LlcAuburndale · 0.7 mi away · NPDES FL0133132
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.
Nearby Lakes in Polk County
Frequently asked questions about Lake Mariana
Where is Lake Mariana?
- Lake Mariana is a lake in Polk County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Lake Mariana?
- Lake Mariana in Polk County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 2 ft visibility. Phosphorus: 32 µg/L.
Is Lake Mariana safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Lake Mariana is listed impaired under Clean Water Act §303(d) (IR 4A) for algal growth, nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Are there boat ramps on Lake Mariana?
- Lake Mariana has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Lake Mariana Public Boat Ramp. Public access is listed as yes.
Can I fish at Lake Mariana?
- Lake Mariana has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Florida's fish and wildlife agency, so check its current regulations before you go.
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Where this data comes from
6 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 samples6 samples · 2020–2024
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from 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