stormwater bmps for SIC Code 4121

Stormwater BMPs for SIC Code 4121, Stormwater Permitting Guide

SIC Code 4121


2026 Stormwater Permit Compliance for SIC Code 4121 and applicable BMPs




Common Type-Based, Structural BMPs

  • Point BMP
    • Constructed Wetland
    • Infiltration Basin
    • Bioretention
    • Sand Filter (surface)
    • Rain Barrel
    • Cistern
    • Wet Pond
    • Dry Pond
  • Linear BMP
    • Grassed Swale
    • Infiltration Trench
    • Vegetated Filter Strip
    • Sand Filter (non-surface)
  • Area BMP
    • Green Roof
    • Porous Pavement


Common Pollutant Sources:

  • Exposure of lumber, residues, and vehicles/equipment to precipitation
  • Parts cleaning
  • Waste disposal of oily rags, oil and gas filters, batteries, coolants, degreasers
  • Fluid replacement including hydraulic fluid, oil, transmission fluid, radiator fluids, and grease
  • Diesel fuel


Common Toxicants

  • Nutrients
    • nitrates
  • Pesticides
    • 2,4-D γ -BHC (lindane)
    • malathion
    • atrazine
    • chlordane
    • diazinon
  • Other organics
    • VOCs
    • 1,3-dichloro-benzene
    • anthracene
    • benzo(a) anthracene
    • benzo(b) fluoranthene
    • benzo(k) fluoranthene
    • benzo(a) pyrene
    • bis (2-ethylhexyl) phthalate
    • fluoranthene
    • fluorene
    • naphthalene
    • pentachlorophenol
    • phenanthrene
    • pyrene
  • Pathogens
    • enteroviruses
    • Shigella
    • Pseudomonas aeruginosa
    • protozoa
  • Heavy Metals
    • nickel
    • cadmium
    • chromium
    • lead
    • zinc
    • copper
  • Salts
    • chloride


Common Pollutants:

  • BOD, TSS, oil, and grease
  • Solvents, oil, heavy metals, acid/alkaline wastes
  • Oil, heavy metals, solvents, acids
  • Oil and grease, arsenic, lead, cadmium, chromium, COD, and benzene
  • Diesel, gasoline, oil

Factors that can affect water quality:

  • Geographic location
  • Hydrogeology
  • Topography
  • Type, duration, and intensity of precipitation events
  • Extent of impervious surfaces (e.g., concrete or asphalt)
  • Type of ground cover (e.g., vegetation, crushed stone, or dirt)
  • Size of the operation



This site focuses or refers to information and services regarding Wattles Total Dissolved Solids (TDS) Stormwater Permit New Industrial General Permit Water Quality Based Effluent Limitation (WQBEL) Storm Water Discharge Associated with Industrial Activity Best Conventional Pollutant Control Technology (BCT) Legally Responsible Person (LRP) National Pollutant Discharge Elimination System (NPDES) Notice of Non Applicability (NONA) Exceedance Response Action (ERA) Industrial Storm wattles Stormwater Drainage Northern California Stormwater Benchmarks Waters of the United States New Discharge(r) Structural Controls Numeric Action Level (NAL) pH Non stormwater Sediment Control BMPs Numeric Action Level (NAL) Exceedance Monitoring Requirements Detected Not Quantifiable Source Quality Assurance/Quality Control (QA/QC) Numeric Effluent Limitation (NEL) Non-Governmental Organization (NGO) Facility Run-on Storm Water Multiple Application and Report Tracking System (SMARTS) Erosion Non Detect Stormwater Discharge Points Regional Water Board Biochemical Oxygen Demand (BOD) Sediment Flocculant Socks Storm Water Systems (SWS) Clean Water Act (CWA) Non Storm Water Discharges (NSWD) Industrial General Permit (IGP) Storm Wattles Notice of Intent (NOI) Sedimentation Wattle Qualified Industrial Storm water Practitioner (QISP) Erosion Control BMPs Drainage Area Storm wattle Effluent Limitation Effluent Method Detection Limit Industrial Materials Total Suspended Solids (TSS) Debris Turbidity Multi Sector General Permit (MSGP) Total Organic Carbon (TOC) Oil and Grease (O&G) Total Maximum Daily Load (TMDL) Runoff Control BMPs Natural Background Third Party Environmental Lawsuit (TPEL) Qualifying Storm Event (QSE) Best Management Practices (BMP) New Source Performance Standards Monitoring Implementation Plan Permit Registration Documents (PRDs) Effluent Limitations Guidelines (ELGs) No Exposure Certification (NEC) Municipal Separate Storm Sewer System (MS4) Division of Water Quality (DWQ) Toxicity Chain of Custody State water Board Stormwater Scrap Metal Permit Trade Secret Discharger Notice of Termination (NOT) State Water Resources Control Board (SWRCB) Standard Industrial Classification (SIC) Water Quality Objectives Stormwater Guarantee Water Quality Standards United States Environmental Protection Agency (U.S. EPA) Minimum Level Good Housekeeping BMPs Southern California Scheduled Facility Operating Hours Operator Field Measurements Storm Water Pollution Prevention Plan (SWPPP) Waste Discharge Identification Number (WDID) Straw Wattles North American Industrial Classification System (NAICS) Effective Date Areas of Special Biological Significance (ASBS) Best Practicable Control Technology Currently Available (BPT) New Source Performance Standards (NSPS) Best Available Technology Economically Achievable (BAT) Sheet Flow Technology Based Effluent Limitation (TBEL) Third Party Environmental Group (TPEG) Ontario Plastic Materials and more.

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Do businesses with sic code 4121 need a stormwater permit to comply with NPDES? Learn More.

Stormwater Permits for SIC Codes:


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