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Baseline general permit: The first general permitting option available to regulated industrial facilities and large construction activities. EPA issued the construction baseline general permit on 9/9/92 (57 FR 41176) and the industrial baseline general permit on 9/25/92 (57 FR 44412). The construction baseline general permit has been replaced by the Construction General Permit, issued on 2/17/98 (63 FR 7857). The industrial baseline general permit has largely been replaced by the Multi-Sector General Permit, issued on 9/25/95 (60 FR 50804).
BAT:  Best available technology economically achievable (applies to non-conventional and toxic pollutants)
BCT: Best conventional pollutant control technology (applies to conventional pollutants)
Biofilter: Dense vegetation designed to filter stormwater runoff as it passes through
BMP: (Best management practice).  Activities or structural improvements that help reduce the quantity and improve the quality of stormwater runoff. BMPs include treatment requirements, operating procedures, and practices to control site runoff, spillage or leaks, sludge or waste disposal, or drainage from raw material storage.
Buffer Strip or Buffer Zone: Strip of grass or other erosion-resistant vegetation located between a waterway and an area
of more intensive land use
Catch basin An entryway to the storm drain system, usually located at a street comer
Category (XI) facilities Specific facilities classified as light industry with equipment or materials exposed to stormwater
CFR Code of Federal Regulations
Clean Water Act  Legislation that provides statutory authority for the NPDES program; Public law 92-500; 33 U.S.C. 1251 et seq. Also known as the Federal Water Pollution Control Act.
Coastal Zone Act Reauthorization Amendments (CZARA)  The Coastal Nonpoint Source Pollution Control Program (Section 6217) addresses nonpoint pollution problems in coastal waters. Section 6217 requires the 29 states and territories with approved Coastal Zone Management Programs to develop Coastal Nonpoint Pollution Control Programs. In its program, a state or territory describes how it will implement nonpoint source pollution controls, known as management measures, that conform with those described in Guidance Specifying Management Measures for Sources of Nonpoint Pollution in Coastal Waters (available at http://www.epa.gov/owow/nps/MMGI/). This program is administered jointly with the National Oceanic and Atmospheric Administration (NOAA).
Code of Federal Regulations  The compilation of federal regulations. Each area of regulation is contained in a separate volume (e.g., environmental regulations are compiled in volume 40, or 40 CFR). Each volume contains up to several hundred parts.
Conduit  Any channel or pipe used to transport flowing water
Conveyance  The process of water moving from one place to another
CSO  Combined sewer overflow
Culvert  A short, closed (covered) conduit that passes stormwater runoff under an embankment, usually a roadway. A rectangular or square concrete culvert is referred to as a box culvert.
Detention  A stormwater system that delays the downstream progress of stormwater runoff in a controlled manner, typically by using temporary storage areas and a metered outlet device
Dike  Also levee; an embankment used to confine or control water. Dikes are often built along the banks of a river to prevent overflow.
Discharge  The volume of water (and suspended sediment if surface water) that passes a given location within a given period of time
Drain inlet insert  A device (tray, bag, or basket) installed in a drain inlet or catch basin to treat stormwater runoff
Erosion  Removal of soil particles by wind and water. Often the eroded debris (silt or sediment) becomes a pollutant via stormwater runoff. Erosion occurs naturally but can be intensified by human activities such as farming, development, road-building, and timber harvesting.
Excavation  The process of removing earth, stone, or other materials from land
Flood  A temporary rise in flow or stage of any watercourse or stormwater conveyance system that results in stormwater runoff exceeding its normal flow boundaries and inundating adjacent, normally dry areas
Flood control  The specific regulations and practices that reduce or prevent the damage caused by stormwater runoff
General permit  A permit issued under the NPDES program to cover a certain class or category of stormwater discharges. These permits reduce the administrative burden of permitting stormwater discharges.
Grading  The cutting and/or filling of the land surface to a desired slope or elevation
Holding pond  A pond or reservoir, usually made of earth, built to store polluted runoff for a limited time
Illicit connection  Any discharge to a municipal separate storm sewer that is not composed entirely of stormwater and is not authorized by an NPDES permit, with some exceptions (e.g., discharges due to fire-fighting activities)
IECA  International Erosion Control Association
Impermeable material  A soil or material whose properties prevent movement of water through the material
Impervious surface  Hard ground cover that prevents or retards the entry of water into the soil and increases runoff, such as
asphalt, concrete, rooftops
Industrial activity  Any activity directly related to manufacturing, processing, or raw materials storage areas at an industrial plant
Infiltration  The portion of rainfall or surface runoff that moves downward into the subsurface rock and soil
Large municipal separate storm sewer system (MS4)  An MS4 located in an incorporated place or county with a population of 250,000 or more, as determined by the 1990 U.S. Census
Light manufacturing facilities  Described under Category (XI) of the definition of "stormwater discharges associated with industrial activity" [40 CFR 122.26(b)(14)(XI)]. Under the Phase I NPDES program, these facilities were eligible for exemption from stormwater permitting requirements if certain areas and activities were not exposed to stormwater. As a result of the Phase II Final Rule, these facilities must now certify to a condition of no exposure.
Maximum extent practicable (MEP)   standard for water quality that applies to all MS4 operators regulated under the NPDES program. Since no precise definition of MEP exists, it allows for maximum flexibility on the part of MS4 operators as they develop and implement their programs.
Media filter  A filter containing sand, compost, sand peat, or perlite and zeolite designed to filter constituents (particulates, oil, bacteria, or dissolved metals) out of stormwater runoff as it passes through the filter
Medium municipal separate storm sewer system (MS4)  MS4 located in an incorporated place or county with a population of 100,000 or more but less than 250,000, as determined by the 1990 U.S. Census
MEP  Maximum extent practicable
A publicly owned conveyance or system of conveyances that discharges to waters of the US and is designed or used for collecting or conveying stormwater, is not a combined sewer, and is not part of a publicly owned treatment works (POTW)
Multisector general permit (MSGP)  An NPDES permit that regulates stormwater discharges from 11 categories of industrial activities
National Pollutant Discharge Elimination System  Two-phased surface water quality program authorized by Congress as part of the
1987 Clean Water Act
"No exposure"  Protection of all industrial materials or activities by a storm-resistant shelter to prevent exposure to rain, snow,
snowmelt, and/or runoff.
Non-delegated state  Any state that does not have the authority to implement the NPDES stormwater program
Nonpoint-source pollutants  Pollutants from many diffuse sources. Nonpoint-source pollution is caused by rainfall or snowmelt moving over and through the ground. As the runoff moves, it picks up and carries away natural and human-made pollutants, finally depositing them into lakes, rivers, wetlands, coastal waters, and even underground sources of drinking water.
Notice of Intent (NOI)  An application to notify the permitting authority of a facility;s intention to be covered by a general permit; exempts a facility from having to submit an individual or group application
NPDES  National Pollutant Discharge Elimination System, the two-phased surface water quality program authorized by Congress as
part of the 1987 Clean Water Act
Outfall  The point where wastewater or drainage discharges from a sewer pipe, ditch, or other conveyance to a receiving body of water
Permitting authority  the NPDES-authorized state agency or EPA regional office that administers the NPDES program, issuing permits, providing compliance assistance, conducting inspections, and enforcing the program
Physically interconnected MS4  One MS4 connected to a second MS4 in such a way that allows direct discharges into the second system
Point-source pollutants  Pollutants from a single, identifiable source such as a factory or refinery; also called single-point-source pollution
Pollutant loading  The total quantity of pollutants in stormwater runoff
Sanitary sewer  A system of underground pipes that carries sanitary waste or process wastewater to a treatment plant
Sediment  Soil, sand, and minerals washed from land into water, usually after rain. Sediment can destroy fish-nesting areas, clog animal habitats, and cloud waters so that sunlight does not reach aquatic plants.
Sheet flow   The portion of precipitation that moves initially as overland flow in very shallow depths before eventually
reaching a stream channel
Site runoff  Any drainage or flood discharge that is released from a specified area
Storm drain  An opening leading to an underground pipe or open ditch for carrying surface runoff, separate from the sanitary sewer or wastewater system
Storm surge  An increase in water level above the normal water level on the open coast due to the action of wind stress and atmospheric pressure on the sea surface
Stormwater  Precipitation that accumulates in natural and/or constructed storage and stormwater systems during and immediately
following a storm event
Stormwater management  Functions associated with planning, designing, constructing, maintaining, financing, and regulating the facilities (both constructed and natural) that collect, store, control, and/or convey stormwater
Stormwater pollution prevention plan (SWPPP)  A plan to describe a process though which a facility thoroughly evaluates potential pollutant sources at a site and selects and implements appropriate measures designed to prevent or control the discharge of pollutants
in stormwater runoff
Stormwater utility  Special assessment district set up to generate a stable source of funding for stormwater management within a region, usually through user fees
Surface runoff  The portion of rainfall that moves over the ground toward a lower elevation and does not infiltrate the soil
Surface water Water that remains on the surface of the ground, including rivers, lakes, reservoirs, streams, wetlands, impoundments, seas, and estuaries Urbanized area  A Bureau of the Census determination of a central place (or places) and the adjacent densely settled surrounding territory that together have a minimum residential population of 50,000 people and a minimum average density of 1,000 people/mi.2.  Urban runoff,  Stormwater from urban areas, which tends to contain heavy concentrations of pollutants from urban activities.  Watershed  Geographical area that drains to a specified point on a water course, usually a confluence of streams or rivers. Also known as drainage area, catchment, or river basin. (In the UK the term "watershed" refers to what in the US is called the drainage divide, and the term "catchment" refers to what in the US is called a watershed.)