Stormwater Treatment

Environmental Concern

Stormwater treatment is one of greatest environmental concerns today. In urban areas, rainwater washes over streets, buildings and parking lots, carrying oil and other pollutants into our waterways. In rural areas, stormwater collects, carrying nitrogen, phosphorus and other unwanted pollutants from fertilizer and fecal matter, harming natural habitats and causing increased erosion. In fact, a significant portion of the nutrient load contributing to the dead zone in the Gulf of Mexico, is associated with non-point source agricultural and urban runoff.

Lafreniere Park; Floating Islands; wildlife habitat; waterfowl habitatInnovative Tool for Stormwater Treatment

BioHaven® Floating Treatment Wetlands are an innovative tool for treating stormwater. They contain rooted, emergent plants growing through a floating matrix of recycled, PET plastic strand to treat stormwater naturally. Through patented design, they provide enhanced microbial growth by expanding available underwater surface area for microbial habitat. The treatment occurs as a result of both plant and microbial nutrient uptake. A managed aquatic plant system, they are effective at controlling algae blooms, protecting ecosystem integrity from point and non-point source pollutants and at helping water quality managers meet stringent TMDL requirements.

Stormwater Treatment with a Surface Area Advantage

The Matrix Advantage

  • Increased Surface Area for Biofilm Growth
  • Microbial Nutrient Removal
  • Plant Nutrient Uptake
  • Sediment Trapping
  • Strength, Support, Durability
  • Modular Construction

Research has shown that the principal mechanism of treatment wetlands to effectively remove unwanted nutrients is through accretion or accumulation and not plant uptake. 


Unmatched Surface Area

Roots below IslandThe matrix of BioHaven® Floating Treatment Wetlands provides approximately 125 square feet per cubic foot of surface area. With the addition of the injected foam, planting medium and plant roots the surface area increases to approximately 250 square feet per cubic foot. This provides a large surface area for microbes and biofilms to attach.

Plant Removal is Counterproductive

As wetland plants are allowed to flourish, treatment efficiency is maximized and long-term, sustainable nutrient removal occurs. In a recent study, plant uptake was less than 1% of the total nitrogen removal, while the remaining removal was attributed to accumulated biofilm and particulate trapping in the root zone and matrix.


Wetland vegetation need not be harvested in order for the system to effectively remove nutrients. This appears to be an unnecessary expense, and likely is counterproductive in the long term. 

-Michael Bateman, Bureau Chief for Environmental Resource Regulation, NW Florida Management District

BioHaven® Floating Treatment Wetlands Features

  • Modular Construction
  • Easy to Install
  • One Time Capital Investment
  • No Annual Plant Replacement Costs


Contact Us today to discuss how BioHaven® Floating Treatment Wetlands can help improve the health and appearance of your stormwater pond or lake.