KDHEs HABs Response Program

The following chart indicates the threshold levels for each type of advisory.

Threshold Levels

Indicator

Watch

Warning

Hazard

Blue-green cell counts (cells/mL)

80,000

250,000

10,000,000

Microcystin toxin level (μg/L)

4

8

2,000

Visual identification

Visual confirmation

Significant blue-green algae surface scum

N/A