Prohibited Discharge Standards
Prohibited Discharge Standards forbid the discharge of any pollutant(s) to a POTW that cause pass through or interference. These national standards apply to all industrial and commercial users that discharge to a POTW, regardless of whether or not the POTW has an approved pretreatment program or whether the industrial user has been issued a control mechanism or permit. These standards are intended to provide general protection for POTWs. However, their lack of specific pollutant limitations. Thus, the need for additional controls are incorporated, namely Categorical Pretreatment Standards and Local Limits. The Prohibited Discharge Standards are listed in .
Categorical Pretreatment Standards:
Categorical Pretreatment Standards limit the pollutant discharges to POTWs from specific process wastewaters of particular industrial categories. These national technology-based standards apply regardless of whether or not the POTW has an approved pretreatment program or the IU has been issued a control mechanism or permit. Such industries are called Categorical Industrial Users. The standards are promulgated by EPA in accordance with Section 307 of the Clean Water Act and are designated in the Effluent Guidelines & Limitations [Parts 405-471] by the terms "Pretreatment Standards for Existing Sources (PSES)" and "Pretreatment Standards for New Sources (PSNS)".
Local Limits reflect the specific needs and capabilities at individual POTWs and are designed to protect the POTW, its receiving waters, and its sludge disposal practices. 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.
Wastewater Discharge Permits:
Wastewater Discharge Permits are issued to Industrial Users, (IUs) Significant Industrial Users, (SIUs) and Categorical Industrial Users (CIUs). These Wastewater Discharge Permits are valid for two (2) years and list certain requirements and conditions that must (required) be met in order to continue to discharge "Non-Domestic Wastewater", "Wastewater" and "Indirect Discharges or Discharge" (herein referred to as"Regulated Process Wastewater" from Commercial - Industrial facility into the City Sewer Collection System and Cedar City Regional Wastewater Treatment Facility (CCRWTF). These requirements include yet, are not limited to controlling the quality and characteristic of their Regulated Process Wastewater discharge by installing Best Available Treatment Technology (BATT) and/or additional regulatory oversight; to treat any volume, concentration/mass of Regulated Process Wastewater (and applicable Conventional/Priority and Local Limitation Pollutants) effluent prior to discharge into the City Sewer Collection System and CCRWTF. Wastewater Discharge Permits require the Permitted Commercial - Industrial User to measure, sample and report to the CCRWTF Pretreatment Program parameter Flow and additional Pollutants, (Conventional/Priority and Local Limitations) at a date/time and frequency/method. Issuance of Wastewater Discharge Permits enables the requirement for subject Commercial - Industrial Users to enable additional Regulatory documents not limited to Spill and Slug Control Plans, (SSCPs) and Total Toxic Organic Management Plans, (TOMPs).