Don't be a carrier: Clean, drain and dry your boat.

The Zebra Mussel Threat

Invasive zebra mussels have devastating economic, recreational, and environmental impacts. The first Texas infestation was found in Lake Texoma in 2009. TPWD and partners closely monitor "positive" and "suspect" lakes, as well as other lakes we consider high risk for zebra mussel introductions (see black dots on map below).

State regulations require draining of water from boats and onboard receptacles when leaving or approaching public fresh waters.

Map showing status of monitored water bodies


A Growing Problem

A native of Eurasia, the zebra mussel had arrived in North America by the late 1980s, invading the Great Lakes Region. Since then the zebra mussel and its close relative the quagga mussel have spread to numerous states through the Mississippi waterway and have traveled overland on boats as far west as California.