How many wastewater treatment plants are there in the world?

According to the Ask Waters database, there were 21,604 publicly owned wastewater treatment facilities currently in operation as of 2004 (the most recent data available). You can find this information at http://iaspub.epa.gov/waters10/query_tool.question_list.

For information on privately owned wastewater facilities, contact the EPA's CWNS Team at:

Web comment form: http://www.epa.gov/cwns/contact.htm