WA— Work Assignment
WADTF— Western Atmospheric Deposition
WAP— Waste Analysis Plan
WAVE— Water Alliances for Environmental
WB— Wet Bulb
WCED— World Commission on Environment
WDROP— Distribution Register of Organic
Pollutants in Water
WENDB— Water Enforcement National Data
WERL— Water Engineering Research Laboratory
WET— Whole Effluent Toxicity test
WHO— World Health Organization
WHP— Wellhead Protection Program
WHPA— Wellhead Protection Area
WHWT— Water and Hazardous Waste Team
WICEM— World Industry Conference on
WL— Warning Letter; Working Level (radon
WLA/TMDL— Wasteload Allocation/Total
Maximum Daily Load
WLM— Working Level Months
WMO— World Meteorological Organization
WP— Wettable Powder
WPCF— Water Pollution Control Federation
WQS— Water Quality Standard
WRC— Water Resources Council
WRDA— Water Resources Development Act
WRI— World Resources Institute
WS— Work Status
WSF— Water Soluble Fraction
WSRA— Wild and Scenic Rivers Act
WSTB— Water Sciences and Technology
WSTP— Wastewater Sewage Treatment Plant
WWEMA— Waste and Wastewater Equipment
WWF— World Wildlife Fund
WWTP— Wastewater Treatment Plant
WWTU— Wastewater Treatment Unit
Waste— 1. Unwanted materials
left over from a manufacturing process. 2.
Refuse from places of human or animal habitation.
Identification of chemical and microbiological
constituents of a waste material.
Waste Exchange— Arrangement
in which companies exchange their wastes for
the benefit of both parties.
Waste Feed— The continuous
or intermittent flow of wastes into an incinerator.
Waste Generation— The
weight or volume of materials and products
that enter the waste stream before recycling,
composting, landfilling, or combustion takes
place. Also can represent the amount of waste
generated by a given source or category of
Waste Load Allocation—
1. The maximum load of pollutants each discharger
of waste is allowed to release into a particular
waterway. Discharge limits are usually required
for each specific water quality criterion
being, or expected to be, violated. 2. The
portion of a stream’s total assimilative
capacity assigned to an individual discharge.
Waste Minimization— Measures
or techniques that reduce the amount of wastes
generated during industrial production processes;
term is also applied to recycling and other
efforts to reduce the amount of waste going
into the waste stream.
Waste Piles— Non-containerized,
lined or unlined accumulations of solid, nonflowing
Waste Reduction— Using
source reduction, recycling, or composting
to prevent or reduce waste generation.
Waste Stream— The total
flow of solid waste from homes, businesses,
institutions, and manufacturing plants that
is recycled, burned, or disposed of in landfills,
or segments thereof such as the “residential
waste stream” or the “recyclable
Waste Treatment Lagoon—
Impoundment made by excavation or earth fill
for biological treatment of wastewater.
Waste Treatment Plant—
A facility containing a series of tanks, screens,
filters and other processes by which pollutants
are removed from water.
Waste Treatment Stream—
The continuous movement of waste from generator
to treater and disposer.
Recovering heat discharged as a byproduct
of one process to provide heat needed by a
Combustor— Facility where recovered
municipal solid waste is converted into a
usable form of energy, usually via combustion.
Wastewater— The spent
or used water from a home, community, farm,
or industry that contains dissolved or suspended
matter.Water Pollution— The presence
in water of enough harmful or objectionable
material to damage the water’s quality.
The plan or network for the collection, treatment,
and disposal of sewage in a community. The
level of treatment will depend on the size
of the community, the type of discharge, and/or
the designated use of the receiving water.
Wastewater Operations and Maintenance—
Actions taken after construction to ensure
that facilities constructed to treat wastewater
will be operated, maintained, and managed
to reach prescribed effluent levels in an
Water Purveyor— A public
utility, mutual water company, county water
district, or municipality that delivers drinking
water to customers.
Water Quality Criteria—
Levels of water quality expected to render
a body of water suitable for its designated
use. Criteria are based on specific levels
of pollutants that would make the water harmful
if used for drinking, swimming, farming, fish
production, or industrial processes.
Water Quality Standards—
State-adopted and EPA-approved ambient standards
for water bodies. The standards prescribe
the use of the water body and establish the
water quality criteria that must be met to
protect designated uses.
Water Quality-Based Limitations—
Effluent limitations applied to dischargers
when mere technology-based limitations would
cause violations of water quality standards.
Usually applied to discharges into small streams.
Water Quality-Based Permit—
A permit with an effluent limit more stringent
than one based on technology performance.
Such limits may be necessary to protect the
designated use of receiving waters (e.g. recreation,
irrigation, industry or water supply).
Water Solubility— The
maximum possible concentration of a chemical
compound dissolved in water. If a substance
is water soluble it can very readily disperse
through the environment.
Water Storage Pond— An
impound for liquid wastes designed to accomplish
some degree of biochemical treatment.
Water Supplier— One who
owns or operates a public water system.
Water Supply System—
The collection, treatment, storage, and distribution
of potable water from source to consumer.
Water Table— The level
Water Treatment Lagoon—
An impound for liquid wastes designed to accomplish
some degree of biochemical treatment.
Water Well— An excavation
where the intended use is for location, acquisition,
development, or artificial recharge of ground
Packaging that dissolves in water; used to
reduce exposure risks to pesticide mixers
Water-Source Heat Pump—
Heat pump that uses wells or heat exchangers
to transfer heat from water to the inside
of a building. Most such units use ground
Waterborne Disease Outbreak—
The significant occurence of acute illness
associated with drinking water from a public
water system that is deficient in treatment,
as determined by appropriate local or state
Watershed— The land area
that drains into a stream; the watershed for
a major river may encompass a number of smaller
watersheds that ultimately combine at a common
Watershed Approach— A
coordinated framework for environmental management
that focuses public and private efforts on
the highest priority problems within hydrologically-defined
geographic areas taking into consideration
both ground and surface water flow.
Watershed Area— A topographic
area within a line drawn connecting the highest
points uphill of a drinking waterintake into
which overland flow drains.
Weight of Scientific Evidence—
Considerations in assessing the interpretation
of published information about toxicity—quality
of testing methods, size and power of study
design, consistency of results across studies,
and biological plausibility of exposure-response
relationships and statistical associations.
Weir— 1. A wall or plate
placed in an open channel to measure the flow
of water. 2. A wall or obstruction used to
control flow from settling tanks and clarifiers
to ensure a uniform flow rate and avoid short-circuiting.
Well— A bored, drilled,
or driven shaft, or a dug hole whose depth
is greater than the largest surface dimension
and whose purpose is to reach underground
water supplies or oil, or to store or bury
fluids below ground.
Well Field— Area containing
one or more wells that produce usable amounts
of water or oil.
Well Injection— The subsurface
emplacement of fluids into a well.
Well Monitoring— Measurement
by on-site instruments or laboratory methods
of well water quality.
Well Plug— A watertight,
gastight seal installed in a bore hole or
well to prevent movement of fluids.
Well Point— A hollow
vertical tube, rod, or pipe terminating in
a perforated pointed shoe and fitted with
a fine-mesh screen.
Wellhead Protection Area—
A protected surface and subsurface zone surrounding
a well or well field supplying a public water
system to keep contaminants from reaching
the well water.
Wetlands— An area that
is saturated by surface or ground water with
vegetation adapted for life under those soil
conditions, as swamps, bogs, fens, marshes,
Wettability— The relative
degree to which a fluid will spread into or
coat a solid surface in the presence of other
Wettable Powder— Dry
formulation that must be mixed with water
or other liquid before it is applied.
Wheeling— The transmission
of electricity owned by one entity through
the facilities owned by another (usually a
Tests to determine the toxicity levels of
the total effluent from a single source as
opposed to a series of tests for individual
Wildlife Refuge— An area
designated for the protection of wild animals,
within which hunting and fishing are either
prohibited or strictly controlled.
The efficiency of a pump and motor together.
Wood Packaging— Wood
products such as pallets, crates, and barrels.
Wood Treatment Facility—
An industrial facility that treats lumber
and other wood products for outdoor use. The
process employs chromated copper arsenate,
which is regulated as a hazardous material.
Air pollution caused by emissions of particulate
matter, carbon monoxide, total suspended particulates,
and polycyclic organic matter from wood-burning
Working Level (WL)— A
unit of measure for documenting exposure to
radon decay products, the so-called “daughters.”
One working level is equal to approximately
200 picocuries per liter.
Working Level Month (WLM)—
A unit of measure used to determine cumulative
exposure to radon.