The Water Environment Federation (WEF) is a not-for-profit technical and educational organization of more than 34,000 individual members and 75 Member Associations (MAs) representing water quality professionals around the world. WEF, which was formerly known as the Federation of Sewage Works Associations and later as the Water Pollution Control Federation, and originated in 1928.  WEF members include experts and specialists in the fields of:
:*environmental engineering
:*industrial wastewater treatment
:*sewage treatment and sewage sludge treatment
:*stormwater management
:*water quality analysis and planning
and related disciplines.
WEF is headquartered in Alexandria, Virginia, United States.