Npdes

Front 1

NPDES
National Pollutant Discharge Elimination System

Back 1

National Pollutant Discharge Elimination System

EPA - Clean Water Act (CWA) Section 402

Front 2

CWA
Clean Water Act (CWA) section 402

Back 2

Clean Water Act (CWA) section 402

Front 3

CFR
Code of Federal Regulations

Back 3

Code of Federal Regulations
The regulations developed by EPA to implement and administer the NPDES program primarily are in Title 40 of the Code of Federal Regulations
(CFR) Part 122

Front 4

POTW
publicly owned treatment works

Back 4

publicly owned treatment works
NPDES permittees can be broadly classified as municipal (publicly owned treatment works [POTWs] and related discharges) and non-municipal facilities. Federal facilities fall into the broader category of non-municipal facilities. Within those broad categories, there might also be specific types of activities that are subject to unique programmatic requirements in the NPDES regulations. Exhibit 2-4 provides an overview of the different activities related to municipal and non-municipal sources; identifies the NPDES program areas that address these activities; and identifies the applicable regulations for each NPDES program area.

Front 5

CSS
combined sewer systems

Back 5

combined sewer systems
An additional concern for some older POTWs may be combined sewer systems (CSS), which are
wastewater collection systems owned by a state or municipality [as defined by CWA section 502(4)] that
convey sanitary wastewater (domestic, commercial and industrial wastewaters) and stormwater through a single-pipe system to a POTW [as defined by §403.3(q)]. EPA estimates that CSSs serve about 40
million people in 772 communities nationwide
<
www.epa.gov/npdes/cso/csodem
>. During dry weather, CSSs collect and convey domestic, commercial, and industrial wastewater to a POTW; however, during periods of rainfall, snowmelt, and other forms of precipitation, the systems can become overloaded. When that
overloading occurs, the CSS can overflow at designed relief points and discharge a combination of untreated sanitary wastewater and stormwater directly to a surface waterbody.

Front 6

CSO
combined sewer overflow

Back 6

A combined sewer overflow (CSO)
www.epa.gov/npdes/cso

is the discharge from a CSS at a point before
the POTW. CSOs can be a major source of water pollution in communities served by CSSs. CSOs often
contain high levels of suspended solids (SS), pathogenic microorganisms, toxic pollutants, floatables, nutrients, oxygen-demanding organic compounds, oil and grease, and other pollutants, causing waterquality standards to be exceeded.

Front 7

SSO
Sanitary sewer overflows

Back 7

Sanitary sewer overflows (SSOs)
Properly designed, operated, and maintained sanitary sewer systems are meant to collect and transport all the sewage that flows into them to a POTW; however, occasional, unintentional spills of raw sewage from municipal sanitary sewers occur in almost every system. Such types of releases are called sanitary sewer overflows (SSOs)
<
www.epa.gov/npdes/sso
>

Front 8

MS4s
Municipal Separate Storm Sewer Systems

Back 8

Municipal Separate Storm Sewer Systems (MS4s)
Stormwater from major metropolitan areas is a significant source of pollutants discharged to waters of the United States. The MS4 stormwater application regulations (Phase I) established requirements for a two-part permit
application that allowed large and
medium local governments to help define priority pollutant sources in the municipality and to develop and implement appropriate controls for such discharges to MS4s (55 FR 47990, November 16, 1990). Part II of the application requires municipal applicants to propose municipal stormwater management programs to control pollutants to the maximum extent practicable (MEP) and to effectively prohibit non-stormwater discharges to the municipal system. Medium and large MS4 operators are required to submit comprehensive permit applications and are issued individual permits.

Front 9

SWPPP
Storm Water Pollution Prevention Program

Back 9

Storm Water Pollution Prevention Program - Program during Construction- Before final project is completed.
Includes surface water runoff mitigations

Front 10

WQMP
Water Quality Management Plan

Back 10

Mitigation programs for projects AFTER completion.
http://www.sbcounty.gov/dpw/land/pdf/WQMP/Guidance_Revision.pdf

Front 11

TMDL
Total Maximum Daily Load

Back 11

Total Maximum Daily Load
Impaired Waters and Total Maximum Daily Loads
http://water.epa.gov/lawsregs/lawsguidance/cwa/tmdl/
Pathogens, Nutrients, Heavy Metals (mercury, lead, Sediment