GreatAmericanLakes

The standard

When New York posts an advisory

New York reports this bacteria standard to EPA for most of its Great Lakes beaches:

  • E. coli, single sample: 235 per 100 mL

A sample over the line means an advisory or a closure until the water tests clean again. A single-sample limit applies to one day’s result; a geometric mean is an average over several samples, so one bad reading counts for less. How beach testing works →

Lake Erie 13

Chautauqua County 7

Erie County 6

All Lake Erie beaches

Lake Ontario 24

Cayuga County 3

Jefferson County 4

Monroe County 6

Niagara County 1

Oswego County 8

Wayne County 2

All Lake Ontario beaches

Data from EPA BEACON 2.0, National List of Beaches 2025, retrieved 2026-10-10. Charts are not for navigation. Corrections tocontact@greatamericanlakes.com.