This study develops a Tailgate Test Kit to be used in the field to test flocculants for reducing turbidity in construction stormwater discharge. Turbidity of stormwater runoff at construction sites varies depending on which site soils are exposed to erosion. Previous research shows that the effectiveness of different flocculants also varies depending on the site soils. As the name suggests; the Tailgate Test Kit is a mobile means to efficiently determine which of the numerously available flocculant products works well for a particular construction site.