There are 55 Pollution Control Companies in District of Columbia, serving a population of 672,391 people in an area of 62 square miles. There is 1 Pollution Control Company per 12,225 people, and 1 Pollution Control Company per 1 square miles.
The state of District of Columbia is ranked 3rd in Pollution Control Companies per capita, and 1st in Pollution Control Companies per square mile.