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Document ID us-sesygu-2025-06-16 Title Septic Systems Guidance URL https://www.epa.gov/septic/septic-systems-guidance Jurisdiction /us Subdomain(s) none Language Status completed Analyzed at 2026-05-12 04:40:41.400826+00:00 Relevance inventory_targeted_fetch

Q Qualitative Requirements (0)

No qualitative requirements.

P Quantitative Requirements (0)

No quantitative requirements.

D Definitions (29)

Req ID Category Name Context Confidence
#D001TMDLstotal maximum daily loadshigh
#D002MS4a 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
#D003SWMPThe 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
#D004POTWpublicly owned treatment workshigh
#D005NPDESNational Pollutant Discharge Elimination Systemhigh
#D006urbanized areaurban areas with a population of at least 50,000high
#D007MSGPMulti-Sector General Permithigh
#D008Category One (i)Facilities subject to federal stormwater effluent discharge standards at 40 CFR Parts 405-471high
#D009Category Two (ii)Heavy manufacturing (e.g., paper mills, chemical plants, petroleum refineries, steel mills and foundries)high
#D010Category Three (iii)Coal and mineral mining and oil and gas exploration and processinghigh
#D011Category Four (iv)Hazardous waste treatment, storage, and disposal facilitieshigh
#D012Category Five (v)Landfills, land application sites, and open dumps with industrial wasteshigh
#D013Category Six (vi)Metal scrapyards, salvage yards, automobile junkyards, and battery reclaimershigh
#D014Category Seven (vii)Steam electric power generating plantshigh
#D015Category Eight (viii)Transportation facilities that have vehicle maintenance, equipment cleaning, or airport deicing operationshigh
#D016Category Nine (ix)Treatment works treating domestic sewage with a design flow of 1 million gallons a day or morehigh
#D017Category Ten (x)Construction sites that disturb 5 acres or more (permitted separately)high
#D018Category Eleven (xi)Light manufacturing (e.g., food processing, printing and publishing, electronic and other electrical equipment manufacturing, public warehousing and storage)high
#D019Pretreatment standardspollutant discharge limits which apply to industrial usershigh
#D020industrial users (IU)A source of indirect discharge.high
#D021Pretreatment requirementssubstantive or procedural requirements applied to IUs.high
#D022pass throughA discharge that exits the POTW into waters of the United States in quantities or concentrations that, alone or in conjunction with a discharge or discharges from other sources, is a cause of a violation of any requirement of the POTW's NPDES permit (including an increase in the magnitude or duration of a violation).high
#D023interfereA discharge that, alone or in conjunction with a discharge or discharges from other sources, both (1) inhibits or disrupts the POTW, its treatment processes or operations, or its sludge processes, use, or disposal; and (2) therefore is a cause of a violation of any requirement of the POTW's NPDES permit (including an increase in the magnitude or duration of a violation) or of the prevention of sewage sludge use or disposal in compliance with ... [applicable] statutory provisions and regulations or permits issued thereunder (or more stringent state or local regulations).high
#D024POTWpublicly owned treatment workshigh
#D025NPDESNational Pollutant Discharge Elimination Systemhigh
#D026Local limitssite-specific and can be numeric or narrative effluent discharge limits, including BMPs.high
#D027PGPPesticide General Permithigh
#D028NOINotice of Intenthigh
#D029NMFSNational Marine Fisheries Servicemedium