Effects of Stormwater Pollution
Total amount of Impervious Surfaces in the Puget Sound Drainage Basin
Number of Acres
370 billion gallons
Puget Sound basin sees an average of more than 370 billion gallons of stormwater runoff from these surfaces each year.
52,000 – 66,000 lbs.
On average, 52,000 – 66,000 pounds of pollutants are released into the Puget Sound ecosystem each day
State Water Quality
The US EPA estimates that pollutants carried by rainwater runoff account for 70% of all water pollution.
Economic costs related to stormwater in the Puget Sound region are expected to exceed $1 billion over the next decade.
About one-third of the state’s waters are too polluted to meet state water quality standards.