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Document ID us-sdfmsmp-2025-05-29 Title Stormwater Discharges from Municipal Sources-Developing an MS4 Program URL https://www.epa.gov/npdes/stormwater-discharges-municipal-sources-developing-ms4-program Jurisdiction /us Subdomain(s) none Language Status completed Analyzed at 2026-05-12 04:42:53.837445+00:00 Relevance inventory_targeted_fetch

Q Qualitative Requirements (27)

Req ID Category Intent Legal Status Name Subdomain(s) Context Conditions Confidence
#Q001administrativeoperationalmandatoryDevelop and Enforce SWMPwastewaterOwners/operators of regulated municipal separate storm sewer systems (MS4s) are required to develop, implement, and enforce a stormwater management program (SWMP).Owners/operators of regulated municipal separate storm sewer systems (MS4s)high
#Q002operationaltreatmentmandatoryConstruction Site Runoff Control ProgramwastewaterInclude a program in your SWMP to reduce pollutants in stormwater runoff to your MS4 from construction activities that disturb ≥ 1 acre of land.construction activities that disturb ≥ 1 acre of landhigh
#Q003prohibitionoperationalrecommendedAuthorized Discharges to MS4wastewaterStormwater and certain authorized types of uncontaminated non-stormwater are the only discharges that should enter your MS4.medium
#Q004operationaloperationalmandatoryIllicit Discharge Detection and Elimination ProgramwastewaterInclude a program in your SWMP to detect and eliminate illicit discharges to your system.high
#Q005operationaloperationalmandatoryPollution Prevention and Good Housekeeping ProgramwastewaterInclude a program to prevent or reduce pollutant runoff from municipal operations into the storm sewer system.high
#Q006operationaltreatmentmandatoryPost-Construction Runoff Control ProgramwastewaterInclude a program to reduce pollutants from new development and redevelopment projects that disturb ≥ 1 acre of land.new development and redevelopment projects that disturb ≥ 1 acre of landhigh
#Q007operationaloperationalmandatoryPublic Education and Outreach ProgramwastewaterImplement a public education program on the impacts of stormwater that includes steps to reduce pollutants in stormwater runoff.high
#Q008administrativereportingmandatoryMeasurable Goals EvaluationwastewaterProvide measurable goals in your SWMP so you can evaluate the program's effectiveness and make adjustments as necessary.high
#Q009reportingreportingmandatoryProgram Progress ReportwastewaterAs part of the program, compile a report on program progress that includes things like the status of compliance with permit conditions, results of any information collected and analyzed, summaries of planned stormwater activities, and any changes that have been made.high
#Q010administrativeoperationalmandatoryIdentify TMDL DischargeswastewaterKnow whether your storm drain system discharges to an impaired water body or a water body with an approved Total Maximum Daily Load (TMDL).high
#Q011operationaloperationalmandatoryProcess for Addressing TMDLwastewaterInclude a process in your SWMP for addressing the TMDL if necessary.if necessaryhigh
#Q012treatmenttreatmentmandatoryCAAP Effluent Guideline CompliancewastewaterNPDES permits for concentrated aquatic animal production (CAAP) facilities that produce 100,000 pounds or more of aquatic animals must include requirements to implement the effluent guidelines established at 40 CFR Part 451.CAAP facilities producing 100,000 pounds or more of aquatic animalshigh
#Q013reportingreportingmandatoryDrug Use and Discharge ReportingwastewaterThese facilities are subject to reporting requirements regarding: The use of certain drugs; [and] Unanticipated discharges.Concentrated aquatic animal production (CAAP) facilitieshigh
#Q014administrativeoperationalmandatoryBMP Plan MaintenancewastewaterDeveloping and maintaining a BMP plan. Annual updates ensure the plans account for facility changes and new or innovative BMPs.Concentrated aquatic animal production (CAAP) facilitieshigh
#Q015operationaltreatmentmandatorySolids Control and Routine CleaningwastewaterRoutine cleaning of rearing units and settling basins minimizes discharge of accumulated solids.Flow-through and recirculating CAAP systemshigh
#Q016operationaloperationalmandatoryAnimal Mortality and Waste DisposalwastewaterRemoval and disposal of animal mortalities and wastes keeps them out of the receiving water.Flow-through and recirculating CAAP systemshigh
#Q017operationaloperationalmandatoryMaterial Storage and Spill PreventionwastewaterProper storage of feed, drugs, chemicals, and pesticides reduces chances of leaks and spills. Prompt cleanup of leaks and spills prevents pollutants from entering the receiving water.Concentrated aquatic animal production (CAAP) facilitieshigh
#Q018operationaloperationalmandatoryStructural Maintenance and InspectionswastewaterRoutine inspections by facility staff help identify damage and necessary repairs. Regular maintenance keeps facilities functioning properly to maintain efficiency and prevent unintended discharges.Concentrated aquatic animal production (CAAP) facilitieshigh
#Q019administrativereportingmandatoryCAAP Operational RecordkeepingwastewaterMaintaining records on feeding, number and weight of aquatic animals, cleaning, inspections, maintenance, and repairs provides documentation that the operator has implemented required management activities.Concentrated aquatic animal production (CAAP) facilitieshigh
#Q020operationaloperationalmandatoryStaff Training ProcedureswastewaterTraining staff on proper spill prevention, operation, and cleaning procedures prepares them to prevent and respond to accidental discharges and spills.Concentrated aquatic animal production (CAAP) facilitieshigh
#Q021operationaltreatmentmandatoryNet Pen Waste and Carcass ManagementwastewaterNPDES permits for these facilities include requirements for: Feed management, waste collection and disposal, transport or harvest discharge, and carcass removal (net pens only).CAAP facilities using net penshigh
#Q022operationaloperationalmandatoryNet Pen Biofouling and SitingwastewaterProper net hygiene practices prevent discharges of biofouling organisms, solids, and anti-fouling chemicals. Properly siting net pens prevents adverse environmental impacts.CAAP facilities using net penshigh
#Q023operationaloperationalmandatoryEscape Prevention and Response PlanswastewaterEscape prevention and response plans ensure that producers have procedures in place to prevent fish escape and can take action in the event fish escape occurs.Net pen facilities where required by NPDES permithigh
#Q024monitoringreportingmandatorySource Water and Effluent Monitoringwastewater, aquatic lifeEffluent monitoring helps assess pollutant levels and verify compliance with NPDES permit conditions. Source water monitoring provides information on levels of pollutants in the intake water.Required where intake credits or net limits are allowed or as specified in the NPDES permithigh
#Q025operationaltreatmentmandatoryDrug and Chemical Application Protocolswastewater, aquatic lifeProper application of drugs and chemicals prevents them from entering the receiving water.Applicable to all CAAP and non-CAAP facilities where drugs or chemicals are usedhigh
#Q026designoperationalmandatoryProduction System and Discharge Sitingwastewater, aquatic life, otherProperly siting production system and discharge points prevents adverse environmental impacts (e.g., to endangered or threatened species and their critical habitat and historical sites) and other use conflicts (e.g., water use, navigation, or other local or state requirements).high
#Q027operationaltreatmentmandatoryNet Hygiene Practiceswastewater, aquatic lifeProper net hygiene practices prevent discharges of biofouling organisms, solids, and anti-fouling chemicals.CAAP facilities using net penshigh

P Quantitative Requirements (7)

Req ID Category Intent Legal Status Name Subdomain(s) Limit Type Limit Value Context Conditions Confidence
#P001operationaloperationalmandatoryConstruction Site Land Disturbance Thresholdotherrequirement>= 1 acreInclude a program in your SWMP to reduce pollutants in stormwater runoff to your MS4 from construction activities.Applies to construction activities that disturb land.high
#P002designoperationalmandatoryPost-Construction Land Disturbance Thresholdotherrequirement>= 1 acreInclude a program to reduce pollutants from new development and redevelopment projects.Applies to new development and redevelopment projects that disturb land.high
#P003designoperationalmandatoryCooling Water Intake Withdrawal Thresholdaquatic liferequirement>= 2 million gallons per dayRule covers roughly 1,065 existing facilities that are designed to withdraw cooling water.Applies to existing electric generating plants and factories.high
#P004operationaloperationalmandatorySite-Specific Entrainment Study Thresholdaquatic liferequirement>= 125 million gallons per dayFacilities must conduct studies to help their permitting authority determine site-specific controls to reduce mortality of aquatic organisms.Applies to facilities that withdraw at least 125 million gallons per day.high
#P005designtreatmentmandatoryExisting Facility Mortality Reduction Compliance Optionsaquatic liferequirement7 optionsThe facilities are required to choose one of seven options to reduce mortality to fish and other aquatic organisms.Existing facilities designed to withdraw at least 2 million gallons per day of cooling water.high
#P006designtreatmentmandatoryNational Entrainment Standard Compliance Alternativesaquatic liferequirement2 alternativesNew units added to an existing facility are required to reduce mortality of aquatic organisms that achieves one of two alternatives under national entrainment standards.New units added to an existing facility.high
#P007operationalreportingmandatoryCSO Public Notification - Annual Notice Frequencywastewaterrequirement1 per yearThe requirements address signage, initial notification... and annual notice provisions.Combined sewer discharges (CSOs) to the Great Lakes.high

D Definitions (0)

No definitions.