T Temperature

TAG Tchnical assistance grant

TALMS Tunable atomic line molecular spectroscopy

TAP Technical assistance program

TAS Tolerance assessment system

TC Target concentration; technical center; toxicity characteristics; toxic concentration

TCE Trichloroethylene

TCLP Toxicity characteristic leaching procedure

TCRI Toxic chemical release inventory

TD Toxic dose; technology development; tropical depression

TDD Telecommunication devices for the deaf

TDS Total dissolved solids

TEAM Total exposure assessment model

TEM Transmission electron microscope; transmission electron microscopy

TFE polytetrafluoroethylene

THC Total hydrocarbons

TEL Tetraethyl lead

THM Trihalomethane

THMFP Trihalomethane formation potential

TIC Total inorganic carbon

TIGER Topologically Integrated Geographic Encoding and Referencing system

TIPS Technical information packages

TLC Thin-layer chromatography

TLV Threshold limit value

TLV-STEL TLV- short tern exposure limit

TLV-TWA TLV- time weighted average

TM Thematic Mapper

TML Tetramethyl lead

TNC The Nature Conservancy

TNCWS Transient non-community water system

TOA Trace organic analysis

TOC Total organic carbon; total organic compound

TQM Total quality management

TON Threshold odor number

TOXNET Toxicology Network

TPC Tropical Prediction Center

TPY Tons per year

TRI Toxic release inventory

TRO Temporary restraining order

TS Tropical storm

TSB Technical Support Branch, TPC

TSCA Toxic Substances Control Act

TSCATS Toxic Substances Control Act test submissions online database

TSS Total suspended solids

TTHM Total trihalomethanes

TTO Total toxic organics

TWA Time weighted average

TWS Transient water system

TZ treatment zone

UAO Unilateral administrative order

UCL Upper control limit

UF Ultrafiltration

UIC Underground injection control

URISA Urban and Regional Information Systems Association

URL Universal Resource Locator

USACE United States Army Corps of Engineers

USAF United States Air Force

USAR Urban search and rescue; United States Army Reserve

USC Unified soil classification; United States Code; University of southern California

USCG United States Coast Guard

USDA United States Department of Agriculture

USDW Underground sources of drinking water

USEPA United States Environmental Protection Agency

USFS United States Forest Service

USFWS US Fish & Wildlife Service

USGS United States Geological Survey

USN United States Navy

USP US Pharmacopeia

USPHS United States Public Health Service

UST Underground storage tank

UTC Universal Time Coordinate

UTM Universal Transverse Mercator

UV Ultraviolet

VA Volatile acids; Virginia

VDH Virginia Department of Health

VOC Volatile organic chemicals

VP Vapor pressure

VS Volatile solids

VSD Virtually safe dose

VSS Volatile suspended solids

WAG Waste area grouping

WAN Wide area network

WASP4 Water analysis simulation program

WB Wet bulb

W/C Water:cement ratio

WEF Water Environment Federation

WERL Water Engineering Research Laboratory

WFO Weather Forecast Office

WHO World Health Organization

WHP Wellhead protection

WHPA Wellhead Protection area

WHRM Wildlife/habitat relationship model

WL Warning letter

WMO World Meteorological Organization

WQAS Water quality analysis system

WQCDs Water quality criteria documents

WQP Water quality parameters

WQS Water quality standard

WRC Water Resources Council

WRDA Water Resources Development Act

WRI World Resources Institute

WSF Water soluble fraction

WSM Watershed model

WSRA Wild and Scenic Rivers Act

WSTB Water sciences and Technology Board

WSTP Wastewater sewage treatment plant

WTIE Wastewater treatment and information exchange

WTP Water treatment plant

WWEMA Waste and Wastewater Equipment Manufacturers Association

WWF World Wildlife Fund

WWT Wastewater treatment

WWTP Wastewater treatment plant

WWTU wastewater treatment unit

XPS X-ray photoelectron spectroscopy

Z Zulu time

ZRL Zero risk level