Since summer 2019, Austin’s Watershed Protection Department has been addressing harmful algae in local lakes. In April, low levels of dihydroanatoxin, a cyanobacteria toxin dangerous to dogs, were found in Lake Austin and Lady Bird Lake. The department announced enhanced monitoring starting June 1, which includes biweekly checks at three sites and additional monitoring at Lake Walter E. Long.
To combat algae blooms, the city plans to use Phoslock, a clay-like material that binds to phosphorus and prevents algae growth. If approved on June 10, a pilot project will involve three applications over 20 acres near Red Bud Isle, costing $300,000. Phoslock is favored for being environmentally friendly compared to traditional algaecides, which can harm other aquatic life.
While the treatment is expected to reduce algae growth and toxicity, caution is still advised for recreational users and dog owners. The project is seen as a pilot with no guaranteed instant results, and further updates will be provided through the city’s algae desktop.
