Solutions for Aquatic Weed and Algae Control in Ponds

Application of EPA-registered and state-permitted aquatic pesticides is the most cost-effective solution to managing pond weed and controlling algae growth in lakes and ponds.

Any pond management effort should include integrated pest management (IPM) techniques and watershed’s best management practices. However, Black Lagoon’s 20+ years of experience has proven that when executed safely and effectively, a regular, low-dose application of algicides and herbicides by licensed, certified aquatic professionals is overwhelmingly successful in algae pond treatment, particularly where budget is limited.

Black Lagoon also recommends some site-specific alternatives to using chemicals for plant and algae control treatment. Some environmentally friendly and effective algae control methods used to promote attractive and healthy lakes and ponds include:

Schedule your free consultation today!

Click below to learn more about the aquatic pesticides that we use.


What Exactly Are Weeds, Anyway?

By definition, a weed is "a plant growing out of place."


Plants can benefit a pond’s ecosystem, but they become “weeds” when they grow out of control or in areas where they interfere with a pond’s usage. Excessive plant growth can create a variety of problems including stunted fish population, mosquito growth, foul odors, unsafe swimming conditions and clogged irrigation pipes. These issues can cost thousands of dollars in repairs and lost ornamentals.

Many aquatic weeds are of little value as a food source or habitat structure. Removing invasive species from your pond allows nature to restore native plants to support the fish and wildlife. The first step to fighting unwanted weed growth in your pond is plant identification



Lakes and ponds are threatened by excessive nutrients entering through lawn and garden run-off, wastewater discharges, detergent wastes, septic tank seepage and agricultural run-off.  Excessive nutrients support dynamic growth of aquatic algae, interfering with intended water uses and sometimes presenting health hazards to humans and animals.

algae bloom in pond
excessive algae growth in pond

"Blooms" of algae, primitive plants with no true leaves, stems or root systems, can lead to a variety of problems:

  • Blue-green algae can cause illness and sometimes fatalities in pets, livestock and wildlife.

  • Exposure to or ingestion of blue-green algae can also lead to a variety of discomforts in humans.

  • Algae contamination can discolor drinking water and create unpleasant odors and tastes.

  • Excessive algae growth can also impart distasteful flavor to fish.

  • Algae decomposition can deplete oxygen in bodies of water and kill fish.

  • Excess algae can impede water intake from fire ponds and irrigation systems.

  • Algae can elevate organic solid content and the biological oxygen demand in wastewater oxidation ponds.

  • Excessive algae growth can quickly change lakes, ponds, lagoons and shorelines from scenic to unsightly.

Close up 1 copy.jpg