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Document ID us-sdfia-2026-03-01-2 Title Stormwater Discharges from Industrial Activities URL https://www.epa.gov/npdes/stormwater-discharges-municipal-sources Jurisdiction /us Subdomain(s) none Language Status completed Analyzed at 2026-05-12 04:43:08.095776+00:00 Relevance inventory_targeted_fetch

Q Qualitative Requirements (4)

Req ID Category Intent Legal Status Name Subdomain(s) Context Conditions Confidence
#Q001administrativeoperationalmandatoryNPDES Permit and SWMP Requirement for MS4 Operatorswastewater, otherTo prevent harmful pollutants from being washed or dumped into MS4s, certain operators are required to obtain NPDES permits and develop stormwater management programs (SWMPs).Applies to certain operators of municipal separate storm sewer systems (MS4s)high
#Q002administrativeoperationalmandatoryStormwater Management Program (SWMP) Content Requirementwastewater, otherThe SWMP describes the stormwater control practices that will be implemented consistent with permit requirements to minimize the discharge of pollutants from the sewer system.high
#Q003administrativeoperationalmandatoryPhase I MS4 Permit Coveragewastewater, otherThe 1990 Phase I regulation requires medium and large cities or certain counties with populations of 100,000 or more to obtain NPDES permit coverage for their stormwater discharges.Applies to medium and large cities or certain counties with populations of 100,000 or morehigh
#Q004administrativeoperationalmandatoryPhase II MS4 Permit Coveragewastewater, otherThe 1999 Phase II regulation requires small MS4s in U.S. Census Bureau defined urbanized areas, as well as MS4s designated by the permitting authority, to obtain NPDES permit coverage for their stormwater discharges.Applies to small MS4s in U.S. Census Bureau defined urbanized areas, as well as MS4s designated by the permitting authorityhigh

P Quantitative Requirements (12)

Req ID Category Intent Legal Status Name Subdomain(s) Limit Type Limit Value Context Conditions Confidence
#P001unknownunknownmandatorypopulationwastewaterrequirement>= 50,000 peopleCensus Bureau urban area designation criteria replacing the term urbanized area to designate small municipal separate storm sewer systems (MS4s)Phase II MS4smedium
#P002unknownunknownmandatorypopulationwastewaterrequirement>= 100,000 peopleRequires medium and large cities or certain counties to obtain NPDES permit coverage for their stormwater dischargesPhase I MS4smedium
#P003operationalreportingmandatoryMosquito control adulticiding thresholdaquatic life, otherrequirement> 6400 acres per calendar yearAnnual treatment threshold for NOI submission eligibilityAdulticiding for mosquito and other flying insect pestshigh
#P004operationalreportingmandatoryWeed and algae control annual treatment area (linear)agricultural water, aquatic liferequirement> 20 linear milesAnnual treatment threshold for NOI submission eligibilityWeed and algae controlhigh
#P005operationalreportingmandatoryWeed and algae control annual treatment area (area)agricultural water, aquatic liferequirement> 80 acresAnnual treatment threshold for NOI submission eligibilityWeed and algae controlhigh
#P006operationalreportingmandatoryAnimal pest control annual treatment area (linear)aquatic liferequirement> 20 linear milesAnnual treatment threshold for NOI submission eligibilityAnimal pest controlhigh
#P007operationalreportingmandatoryAnimal pest control annual treatment area (area)aquatic liferequirement> 80 acresAnnual treatment threshold for NOI submission eligibilityAnimal pest controlhigh
#P008operationalreportingmandatoryForest canopy pest control thresholdotherrequirement> 6400 acres per calendar yearAnnual treatment threshold for NOI submission eligibilityForest canopy pest controlhigh
#P009operationalreportingmandatoryStandard NOI submission timeline (30-day)aquatic liferequirement>= 30 days prior to first dischargeNotice of Intent submission deadlineStandard pesticide applications requiring NOIhigh
#P010operationalreportingmandatoryEmergency NOI submission timeline (15-day)aquatic liferequirement<= 15 days after first dischargeNotice of Intent submission deadline for emergenciesDeclared Pest Emergencieshigh
#P011operationalreportingmandatoryStandard NOI submission timeline (10-day)aquatic liferequirement>= 10 days prior to first dischargeNotice of Intent submission deadline for specific entitiesApplications by small entities or specific districtshigh
#P012operationalreportingmandatoryEmergency NOI submission timeline (30-day)aquatic liferequirement<= 30 days after first dischargeNotice of Intent submission deadline for emergencies for specific entitiesDeclared Pest Emergencies for specific entitieshigh

D Definitions (9)

Req ID Category Name Context Confidence
#D001publicly owned treatment worksA treatment works (as defined by CWA section 212) that is owned by a state or municipality [as defined by CWA section 502(4)]. This definition includes any devices or systems used in the storage, treatment, recycling, and reclamation of municipal sewage or industrial wastes of a liquid nature. It also includes sewers, pipes, or other conveyances only if they convey wastewater to a POTW treatment plant. The term also means the municipality [as defined in CWA section 502(4)] that has jurisdiction over the indirect discharges to and the discharges from such a treatment works. [40 CFR 403.3(q)]high
#D002NPDESNational Pollutant Discharge Elimination Systemhigh
#D003MS4a conveyance or system of conveyances that is: owned by a state, city, town, village, or other public entity that discharges to waters of the U.S., designed or used to collect or convey stormwater (e.g., storm drains, pipes, ditches), not a combined sewer, and not part of a sewage treatment plant, or publicly owned treatment works (POTW).high
#D004SWMPstormwater management programshigh
#D005BMPsBest Management Practiceshigh
#D006POTWpublicly owned treatment workshigh
#D007urbanized areasurban areas with a population of at least 50,000high
#D008Phase I MS4smedium and large cities or certain counties with populations of 100,000 or morehigh
#D009Phase II MS4ssmall MS4s in U.S. Census Bureau defined urbanized areas, as well as MS4s designated by the permitting authority, to obtain NPDES permit coverage for their stormwater discharges. Phase II also includes non-traditional MS4s such as public universities, departments of transportation, hospitals and prisons.high