Stormwater Facts by the NUMBERS
10%
Over 10% impervious surface in a watershed can lead to significant stormwater runoff issues
On average, less than 10% of rainfall infiltrates the ground, while the rest becomes runoff
16x
Urban areas can generate up to 16 times more runoff than natural landscapes
$1,000,000,000 +
Stormwater pollution costs billions annually in water treatment, ecosystem restoration, and health-related expenses
Governments and businesses worldwide are investing billions in sustainable stormwater management projects to address environmental challenges
27,000 gallons
An inch of rainfall on an acre generates over 27,000 gallons of runoff
30 +
Contaminated stormwater can pose health risks, with over 30 waterborne diseases associated with polluted water
$1,000,000
Green infrastructure can save cities millions by reducing the need for costly traditional stormwater management systems