National Emission Standards for Hazardous Air Pollutants: Publicly Owned Treatment Works

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A proposed rule for the publicly owned treatment works (POTW) source category is required to implement section 112 of the Clean Air Act as amended (Act) and reflects the Administrator's determination that POTW sources emit hazardous air pollutants (HAP) identified on the EPA's amended list of 188 HAP. The primary HAP emitted by these sources include xylenes, methylene chloride, toluene, ethyl benzene, chloroform, tetrachloroethylene, benzene, and naphthalene. The emission standards that the EPA is proposing with today's notice would require control for HAP emissions from each new or reconstructed POTW treatment plant which is a major source of HAP. The standards would also require each existing and new POTW treatment plant that treats specific industrial waste streams from an industrial user, for the purpose of allowing that industrial user to comply with another National Emission Standard for Hazardous Air Pollutants (NESHAP), to meet the treatment and control requirements of the relevant NESHAP. The EPA is not proposing any standard for publicly owned sewage and wastewater collection systems at this time, because sufficient information is not available at present to determine the