Cornell Cooperative Extension

Tompkins County
Florida channel cleared of hydrilla
Image by SW Florida Water Management District

Florida spends millions each year to clear boat channels through dense hydrilla infestations.

Economic Impacts of Hydrilla

Hydrilla poses serious threats to the economies of communities surrounding infested bodies of water. Hydrilla can reduce water flow in canals and ditches up to 85% and can clog or damage dams, power plants, and other water control structures. Hydrilla's negative effect on fish populations can also adversely affect anglers and fishermen, and heavy infestations interfere with boating and swimming, as the plant increases risk of drowning. All of these factors can decrease the value of lake shore properties, and therefore tax revenue in affected areas, leading to a decline in the economy.


—What if hydrilla is allowed to spread uncontrolled to Cayuga Lake, the Finger Lakes & Great Lakes?

Based on experience in Florida and South Carolina, expect NYS to pay $10,000,000+ per year in perpetuity.   Plus millions in last tax revenue from reduced property and sales taxes.  Read about economic impacts projected for Cayuga Inlet and Ithaca area.

Hydrilla in Florida

Economic Impacts in Florida

Florida faces severe hydrilla invasion and, as a result, spends millions of dollars on hydrilla management each year.

Read more
Hydrilla Infestation, USDI National Park Service

Economic Impacts in SC

Increased aquatic vegetation can cause damage to propellers and cause boaters much more money in annual maintenance.

Read more

Last updated June 7, 2017

Economic Impacts

Useful Resources

The California Department of Food and Agriculture Hydrilla Eradication Program Annual Progress Report 2010

Quick Facts

  • Hydrilla is one of the world’s most invasive plants.
  •  Can grow up to a foot a day.
  • Forms thick dense mats that block sunlight and kill native plants.
  • Reduces oxygen in the water and alters fish habitat.
  •  Eliminates waterfowl feeding areas and fish spawning sites.
  • Obstructs boating,swimming, and fishing.
  • Lowers the value of waterfront property.
  •  Blocks intakes at water treatment,power generation, and industrial facilities.
  • Clogs flood control channels.