As of April 2012, aquatic vegetation (586 acres hydrilla, 86 acres Eurasian watermilfoil, and a mix of other plants) covered 41% of Lake Austin. Because of its dense and rapid growth, hydrilla has the potential to impact virtually every one of Lake Austin's uses:
- Intakes for drinking water, power generation and irrigation can be clogged
- Shoreline access and boating traffic can be restricted
- Swimmers can get tangled in its thick growth
- Water quality may degrade as dense vegetation dies and decomposes
- Plant and animal diversity will decline as hydrilla takes over
- Property values can decrease as recreation is limited by dense plant growth
- Hydrilla may spread downstream to Town Lake and the lower Colorado River.