--- kind: "unit" title: "40" title_heading: "Protection of Environment" key: "chI/subchN" level: "subchap" label: "Subchapter N" heading: "Effluent Guidelines and Standards" release: "ecfr-current" date: "2026-08-27" url: "https://uscodex.org/cfr/40/chI-subchN" sections_count: 3229 --- # Subchapter N — Effluent Guidelines and Standards Title 40 C.F.R. — Protection of Environment › Chapter I — Environmental Protection Agency ## Contents - [Part 400 — Part 400 [reserved]](/cfr/40/chI-subchN-part400.md) - [Part 401 — General Provisions](/cfr/40/chI-subchN-part401.md) - [Part 402 — Part 402 [reserved]](/cfr/40/chI-subchN-part402.md) - [Part 403 — General Pretreatment Regulations for Existing and New Sources of Pollution](/cfr/40/chI-subchN-part403.md) - [Part 405 — Dairy Products Processing Point Source Category](/cfr/40/chI-subchN-part405.md) - [Part 406 — Grain Mills Point Source Category](/cfr/40/chI-subchN-part406.md) - [Part 407 — Canned and Preserved Fruits and Vegetables Processing Point Source Category](/cfr/40/chI-subchN-part407.md) - [Part 408 — Canned and Preserved Seafood Processing Point Source Category](/cfr/40/chI-subchN-part408.md) - [Part 409 — Sugar Processing Point Source Category](/cfr/40/chI-subchN-part409.md) - [Part 410 — Textile Mills Point Source Category](/cfr/40/chI-subchN-part410.md) - [Part 411 — Cement Manufacturing Point Source Category](/cfr/40/chI-subchN-part411.md) - [Part 412 — Concentrated Animal Feeding Operations (cafo) Point Source Category](/cfr/40/chI-subchN-part412.md) - [Part 413 — Electroplating Point Source Category](/cfr/40/chI-subchN-part413.md) - [Part 414 — Organic Chemicals, Plastics, and Synthetic Fibers](/cfr/40/chI-subchN-part414.md) - [Part 415 — Inorganic Chemicals Manufacturing Point Source Category](/cfr/40/chI-subchN-part415.md) - [Part 416 — Part 416 [reserved]](/cfr/40/chI-subchN-part416.md) - [Part 417 — Soap and Detergent Manufacturing Point Source Category](/cfr/40/chI-subchN-part417.md) - [Part 418 — Fertilizer Manufacturing Point Source Category](/cfr/40/chI-subchN-part418.md) - [Part 419 — Petroleum Refining Point Source Category](/cfr/40/chI-subchN-part419.md) - [Part 420 — Iron and Steel Manufacturing Point Source Category](/cfr/40/chI-subchN-part420.md) - [Part 421 — Nonferrous Metals Manufacturing Point Source Category](/cfr/40/chI-subchN-part421.md) - [Part 422 — Phosphate Manufacturing Point Source Category](/cfr/40/chI-subchN-part422.md) - [Part 423 — Steam Electric Power Generating Point Source Category](/cfr/40/chI-subchN-part423.md) - [Part 424 — Ferroalloy Manufacturing Point Source Category](/cfr/40/chI-subchN-part424.md) - [Part 425 — Leather Tanning and Finishing Point Source Category](/cfr/40/chI-subchN-part425.md) - [Part 426 — Glass Manufacturing Point Source Category](/cfr/40/chI-subchN-part426.md) - [Part 427 — Asbestos Manufacturing Point Source Category](/cfr/40/chI-subchN-part427.md) - [Part 428 — Rubber Manufacturing Point Source Category](/cfr/40/chI-subchN-part428.md) - [Part 429 — Timber Products Processing Point Source Category](/cfr/40/chI-subchN-part429.md) - [Part 430 — The Pulp, Paper, and Paperboard Point Source Category](/cfr/40/chI-subchN-part430.md) - [Part 431 — Part 431 [reserved]](/cfr/40/chI-subchN-part431.md) - [Part 432 — Meat and Poultry Products Point Source Category](/cfr/40/chI-subchN-part432.md) - [Part 433 — Metal Finishing Point Source Category](/cfr/40/chI-subchN-part433.md) - [Part 434 — Coal Mining Point Source Category Bpt, Bat, Bct Limitations and New Source Performance Standards](/cfr/40/chI-subchN-part434.md) - [Part 435 — Oil and Gas Extraction Point Source Category](/cfr/40/chI-subchN-part435.md) - [Part 436 — Mineral Mining and Processing Point Source Category](/cfr/40/chI-subchN-part436.md) - [Part 437 — The Centralized Waste Treatment Point Source Category](/cfr/40/chI-subchN-part437.md) - [Part 438 — Metal Products and Machinery Point Source Category](/cfr/40/chI-subchN-part438.md) - [Part 439 — Pharmaceutical Manufacturing Point Source Category](/cfr/40/chI-subchN-part439.md) - [Part 440 — Ore Mining and Dressing Point Source Category](/cfr/40/chI-subchN-part440.md) - [Part 441 — Dental Office Point Source Category](/cfr/40/chI-subchN-part441.md) - [Part 442 — Transportation Equipment Cleaning Point Source Category](/cfr/40/chI-subchN-part442.md) - [Part 443 — Effluent Limitations Guidelines for Existing Sources and Standards of Performance and Pretreatment Standards for New Sources for the Paving and Roofing Materials (tars and Asphalt) Point Source Category](/cfr/40/chI-subchN-part443.md) - [Part 444 — Waste Combustors Point Source Category](/cfr/40/chI-subchN-part444.md) - [Part 445 — Landfills Point Source Category](/cfr/40/chI-subchN-part445.md) - [Part 446 — Paint Formulating Point Source Category](/cfr/40/chI-subchN-part446.md) - [Part 447 — Ink Formulating Point Source Category](/cfr/40/chI-subchN-part447.md) - [Part 449 — Airport Deicing Point Source Category](/cfr/40/chI-subchN-part449.md) - [Part 450 — Construction and Development Point Source Category](/cfr/40/chI-subchN-part450.md) - [Part 451 — Concentrated Aquatic Animal Production Point Source Category](/cfr/40/chI-subchN-part451.md) - [Part 454 — Gum and Wood Chemicals Manufacturing Point Source Category](/cfr/40/chI-subchN-part454.md) - [Part 455 — Pesticide Chemicals](/cfr/40/chI-subchN-part455.md) - [Part 457 — Explosives Manufacturing Point Source Category](/cfr/40/chI-subchN-part457.md) - [Part 458 — Carbon Black Manufacturing Point Source Category](/cfr/40/chI-subchN-part458.md) - [Part 459 — Photographic Point Source Category](/cfr/40/chI-subchN-part459.md) - [Part 460 — Hospital Point Source Category](/cfr/40/chI-subchN-part460.md) - [Part 461 — Battery Manufacturing Point Source Category](/cfr/40/chI-subchN-part461.md) - [Part 463 — Plastics Molding and Forming Point Source Category](/cfr/40/chI-subchN-part463.md) - [Part 464 — Metal Molding and Casting Point Source Category](/cfr/40/chI-subchN-part464.md) - [Part 465 — Coil Coating Point Source Category](/cfr/40/chI-subchN-part465.md) - [Part 466 — Porcelain Enameling Point Source Category](/cfr/40/chI-subchN-part466.md) - [Part 467 — Aluminum Forming Point Source Category](/cfr/40/chI-subchN-part467.md) - [Part 468 — Copper Forming Point Source Category](/cfr/40/chI-subchN-part468.md) - [Part 469 — Electrical and Electronic Components Point Source Category](/cfr/40/chI-subchN-part469.md) - [Part 471 — Nonferrous Metals Forming and Metal Powders Point Source Category](/cfr/40/chI-subchN-part471.md)