: Beyond California, the EPA's 2020 Beach Report noted that 68% of monitored U.S. beaches were tested for bacteria that year, with specific focus on Enterococci , an indicator of fecal contamination. Other "Beach Bug" Reports (2020)

: Travelers were warned of sand fleas (small crustaceans) and sand flies (biting midges), which are often most active during the summer months. Annual Beach Report Card 2020 - Heal the Bay

: Los Angeles County’s most frequent offender was Marina Del Rey Mother’s Beach , which often struggles with bacteria because its enclosed nature prevents pollution from being flushed away by waves.

: A warm spring and wet summer were predicted to increase tick and mosquito activity, particularly in the Northeast and Southeast.

: Wet weather conditions generally worsened grades across the state. This is typically caused by major rain events that wash urban pollution and bacteria directly into the ocean.