There are 223 Pollution Control Companies in Washington, serving a population of 7,169,967 people in an area of 66,439 square miles. There is 1 Pollution Control Company per 32,152 people, and 1 Pollution Control Company per 297 square miles.
The state of Washington is ranked 18th in Pollution Control Companies per capita, and 26th in Pollution Control Companies per square mile.