10 Best Aquatic Herbicides 2025 in the United States

The Airmax Shoreline Defense Emergent Weed Control is a versatile aquatic herbicide that tackles a broad spectrum of emergent weeds, including cattails, phragmites, and pond grass. Notably, it targets the root system of the plants, ensuring long-term control and preventing re-growth, which is essential for persistent aquatic weeds. The product is easy to apply using a tank sprayer and works effectively in various aquatic environments, such as lakes, ponds, rivers, and streams, without causing harm to fish, birds, and other aquatic life when used as directed.

This makes it environmentally friendly and safe around pets and livestock, with no water use restrictions. However, it's essential to mix the herbicide with a surfactant for optimal results, adding an extra step to the application process. At 128 fluid ounces, it can cover up to 10,000 square feet, making it efficient for large areas. Though the product is relatively heavy at 10.5 pounds, it remains manageable. For those looking to reclaim their shoreline or dock from invasive aquatic weeds, this product provides a robust solution with minimal environmental impact.

The United Phosphorus Inc Hydrothol 191 Herbicide is a granular aquatic herbicide designed for use in drainage canals, lakes, and ponds. With an active ingredient concentration of 11.2% Endothall, it is effective in controlling a variety of aquatic weeds. The product is quite user-friendly with its granule form, simplifying the application process for broad coverage of up to 1000 square feet with a 20-pound package. This makes it suitable for medium to large water bodies requiring weed control.

One of the main advantages of Hydrothol 191 is its contact action, which means it works quickly to eliminate weeds upon application. However, this also means that it might need repeat applications to ensure long-term weed management, as it doesn't offer systemic control that can target the weed's root system. Users should also be mindful of potential water use restrictions post-application, depending upon local regulations.

While effective in weed control, it is essential to consider the possible environmental impact, particularly on non-target aquatic species. As with most herbicides, caution should be taken to minimize adverse effects on the surrounding ecosystem. In summary, Hydrothol 191 is a strong choice for those needing immediate relief from aquatic weeds in larger water areas, but its lack of systemic action and potential environmental impact are factors to consider.

The Airmax EasyKlear Pond & Lake Algae & Weed Vegetation Control is designed for tackling a variety of submerged weeds and algae, making it a versatile option for pond and lake maintenance. It is especially effective against bottom-growing algae like Chara and submerged aquatic vegetation. The granular form makes it easy to apply using a spreader, eliminating the need for mixing or measuring, which simplifies the application process.

This product is contact-based, meaning it begins working immediately upon contact with the target species, leading to quick results. However, it does not have systemic action, so it may require reapplication for persistent or extensive infestations. It is particularly useful around docks and shorelines, making it a good choice for recreational water areas. The treatment is designed to work even in moving water, which increases its versatility for different aquatic environments.

While the product description does not mention specific water use restrictions, it's important to follow any local regulations regarding the use of herbicides in water bodies. The environmental impact and persistence of this herbicide are not explicitly detailed, but as an EPA-registered product, it should meet certain safety standards. Airmax's EasyKlear Defense offers a practical solution for those needing reliable and easy-to-apply aquatic vegetation control.