Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
UWWTD plants equipped with additional polishing treatment steps. European Environmental Agency thematic page (https://www.eea.europa.eu/themes/water/european-waters/water-use-and-environmental-pressures/uwwtd) (accessed 3 May 2021). The dots representing the plants in the map are coloured according to the treatment type.
