Hydrilla removal & prevention FAQ.

On public water — including many Highland Lakes shorelines — anyone treating, physically removing, or stocking biological controls must submit a nuisance aquatic vegetation treatment proposal for approval by TPWD or the local controlling authority (such as LCRA). Private, enclosed ponds generally do not need a vegetation removal permit for physical cleanup, but permits are still required if you buy biological control agents.

Yes. Hydrilla is a prohibited exotic species. Management on public water falls under the State Aquatic Vegetation Plan overseen by Texas Parks and Wildlife Department (TPWD).

TPWD looks at large-scale proposals carefully. Moderate submerged vegetation can help largemouth bass fisheries and water clarity. Balanced control is often the goal — not wiping every plant from a lake when native cover still helps the fishery.

Only sterile (triploid) grass carp are legal in Texas, and you need a permit. They work well on large reservoirs, lakes, and private ponds because hydrilla is a preferred food. Expect slow feeding in year one, and avoid overstocking — they can overgraze beneficial natives.

Herbicides such as fluridone, endothall, and copper complexes are used for extensive reservoir infestations or localized pond outbreaks when rapid knockdown is needed. Labels and seasonal schedules must be followed. They are often avoided in spring-fed rivers where dilution is fast and endangered species are present. Hydrilla Hunters ATX focuses on chemical-free manual shoreline work for lake houses.

Physical and mechanical methods clear slips and docks quickly, but hydrilla fragments easily. Every cut stem can root and start a new colony. Removed plants must be dried, bagged, or composted away from the shoreline. Leaving floating cuttings behind often spreads the problem.

Reservoirs like Lake Austin or Lake LBJ often combine sterile grass carp with targeted herbicides for lake-wide pressure. The San Marcos River — home to eight endangered species, including Texas wild rice — strongly discourages herbicides. There, managers use manual root-and-tuber removal by divers and replant natives for competition.

For personal docks and swim areas, thorough manual removal with every fragment bagged and hauled away is the practical first step. Pairing cleanup with prevention — like a lake blanket in problem zones — helps slow regrowth so you are not cutting again every few weeks.

Call or text Spencer at (254) 312-1113. We serve Lake Austin, Lake Travis, and surrounding Highland Lakes waterfront properties with one-time cleanups, recurring plans, and lake blanket installs.