Harmful Blue-Green Algae Bloom Beach Trends

2009-2019 Trends

The number of reported harmful blue-green algae blooms in New York State has been increasing. The charts below show the following trends:

  • Overall, the number of lost beach days due to harmful blue-green algae blooms has been increasing.
  • The number of harmful blue-green algae-related beach closures has been increasing. More beaches are closing and blooms are occurring more frequently.
  • The average number of days that beaches are closed is increasing and beaches are closing for longer periods of time.
  • Harmful blue-green algae blooms are occurring on more waterbodies with beaches.

Beach operators have been following New York State’s harmful blue-green algal bloom bathing beach guidance since 2010. While harmful blue-green algal blooms have been occurring more frequently and for longer durations at New York’s beaches, the number of harmful blue-green algae-related reported illnesses remains very low due to in part to the vigilance of beach operators and local officials in following New York State’s guidance and notifying the public of the importance of staying away from any strongly colored water and floating mats and scums.

Click to enlarge chart showing number of lost beach days due to BGA blooms from 2009-2017 Click to enlarge chart showing number of times beaches closed due to BGA blooms from 2009-2017 Click to enlarge chart showing number of beaches that closed due to harmful BGA blooms from 2009-2017 Click to enlarge chart showing the average number of days beaches remained closed due to harmful BGA blooms from 2009-2017 Number of waterbodies with BGA beach closures from 2009-2017