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National Pollutant Discharge Elimination System (NPDES) |  |
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Pretreatment Standards & LimitsThe National Pretreatment Program identifies specific requirements that apply to all IUs, additional requirements that apply to all SIUs, and certain requirements that only apply to CIUs. The objectives of the National Pretreatment Program are achieved by applying and enforcing three types of discharge standards: Prohibited discharge standards are somewhat general, national standards are applicable to all industrial users to a POTW, regardless of whether or not the POTW has an approved pretreatment program or the industrial user has been issued a permit. These standards are designed to protect against pass through and interference, protect the POTW collection system, and to promote worker safety and beneficial biosolids use. These standards are listed in 40 CFR 403.5 Categorical Pretreatment Standards are limitations on pollutant discharges to publicly owned treatment works (POTWs), promulgated by EPA in accordance with Section 307 of the Clean Water Act that apply to specific process wastewaters of particular industrial categories. These are national, technology-based standards that apply regardless of whether or not the POTW has an approved pretreatment program or the industrial user has been issued a permit. Such industries are called Categorical Industrial Users. The standards applicable to industrial discharges to a POTW collection system are designated in the Effluent Guidelines & Limitations [Parts 405-471] by the terms "Pretreatment Standards for Existing Sources" (or "PSES") and "Pretreatment Standards for New Sources" (or "PSNS"). Note: The Effluent Guidelines & Limitations designated by the terms "Best Practicable Control Technology Currently Available (BPT)", "Best Available Technology Economically Achievable (BAT)", "Best Conventional Pollutant Control Technology (BCT)", and "New Source Performance Standards (NSPS)" apply to industries that discharge process wastewater to waters of the U.S. and should have an National Pollutant Discharge Elimination System (NPDES) Permit. Regulations for all Effluent Guidelines and Standards are located at: http://www.epa.gov/docs/epacfr40/chapt-I.info/subch-N.htm Additional information on ongoing Categorical Standards Projects and recently published rules is located at: http://www.epa.gov/ost/guide/ Local limits are developed to reflect specific needs and capabilities at individual POTWs and designed to protect the POTW receiving waters. Regulations at 40 CFR 403.8(f)(4) state that POTW Pretreatment Programs must develop local limits or demonstrate that they are unnecessary; 40 CFR 403.5(c) states that local limits are needed when pollutants are received that could result in pass through or interference at the POTW. Essentially, local limits translate the general prohibited discharge standards of 40 CFR 403.5 to site-specific needs. Assistance on how to develop local limits may be found in the Guidance Manual for the Development and Implementation of Local Discharge Limitations Under the Pretreatment Program, December 1987 (EPA#833-B-87-202, ERIC#W107, NTIS#PB92-129188). Information related to ordering this publication from the Office of Wastewater Management is located at: http://www.epa.gov/owm/inpub.htm. EPA Supplemental Manual on the Development And Implementation of Local Discharge Limitations Under the Pretreatment Program: Residential and Commercial Toxic Pollutant Loadings and POTW Removal [PDF Format] published May 1, 1991 provides information related to residential and commercial sources of toxic pollutants and estimated removal efficiencies of municipal treatment processes. Final Local Limits Development Guidance - This is the final technically-based local limits guidance manual for municipalities that operate pretreatment programs. This manual provides guidance to municipalities on the development and implementation of local controls for discharges of industrial or commercial wastes to sewage treatment facilities. This manual provides technical assistance and guidance on:
Local Limits Development Guidance
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