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NPDES- National Pollutant Discharge Elimination System. The name of the regulatory program that addresses pollution associated with stormwater runoff.
BMP- Best Management Practice. This can be any activity or installed feature that is used to contain, control or treat stormwater runoff (ex. silt fences, turbidity barriers, alum treatment, street sweeping).
NOI- Notice of Intent. An application to obtain coverage under FDEP's Generic Permit for Stormwater Discharge from Large and Small Construction Activities.
NOT- Notice of Termination. An application to discontinue coverage under FDEP's Generic Permit for Stormwater Discharge from Large and Small Construction Activities.
SWPPP- Stormwater Pollution Prevention Plan. A guidance document that must be prepared in conjunction with the NOI. It addresses how a site will be managed for erosion and sediment control through the duration of the project.
MS4- Municipal Separate Storm Sewer System. This includes the stormwater collection, conveyance and treatment system owned and maintained by a municipality (ex. inlets, street gutters, storm pipes, ditches, ponds).
Illicit Stormwater Discharge- any discharge to an Municipal Separate Storm Sewer System (MS4) that is not composed entirely of stormwater. Exceptions exist for discharges pursuant to an NPDES permit and the following categories of non-stormwater discharges, provided they do not cause a violation of water quality standards: water line flushing, landscape irrigation, air conditioning condensate, water from residential car washing, dechlorinated swimming pool discharges, and other similar discharges as listed in the County NPDES permit.
Turbidity- the presence of sediment or particles stirred up or suspended in the water column. Relative to stormwater, turbidity is measured with a meter that records in nephelometric turbidity units (NTUs). All discharges from pollution sources must be no more than 29 NTUs above the background readings for the receiving waterbody. Any discharges into Outstanding Florida Waters (OFWs) must not be greater than the background conditions.
TMDL- A Total Maximum Daily Load (TMDL) is a term describing a value of the maximum amount of a pollutant that a body of water can receive while still meeting water quality standards.
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