TSS total suspended solids
TTC threshold of toxicological concern
UCMR Unregulated Contaminant Monitoring Regulation
UIC underground injection control
UOSA Upper Occoquan Service Authority
USAID U.S. Agency for International Development
USACE U.S. Army Corps of Engineers
USDA U.S. Department of Agriculture
USBR U.S Bureau of Reclamation
USGS U.S. Geological Survey
WET whole effluent toxicity
WERF Water Environment Research Foundation
WHO World Health Organization
WRP water reclamation plant
YAR yeast androgen receptor
YES yeast estrogen

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