From the Document: "The U.S. Environmental Protection Agency's Office of Inspector General conducted this evaluation to determine how the EPA is exercising its authority under the Clean Water and Safe Drinking Water Acts to address harmful algal blooms and protect human health and the environment. Harmful algal blooms impact our nation's recreational and drinking waters. They occur when, among other conditions, high levels of nutrients--nitrogen and phosphorus--pollute rivers, lakes, and reservoirs. These nutrients reach bodies of water from sources such as livestock operations; fertilizer runoff from farm fields, lawns, and gardens; urban stormwater; and industrial and municipal discharges."
U.S. Environmental Protection Agency, Office of Inspector General, Report No. 21-E-0264
U.S. Environmental Protection Agency: https://www.epa.gov/