EPA recently published its updated Industrial User Inspection and Sampling Manual for POTWs.
Completed revisions to the 1994 Industrial User Inspection and Sampling Manual for POTWs based on extensive input from experts in the Office of Wastewater Management, and the Office of Science and Technology, and experts in regions, states, and POTWs. The revised Industrial User Inspection and Sampling Manual for POTWs is an inspection support tool provided by EPA for use by field personnel conducting inspections and sampling activities under the Clean Water Act (CWA) National Pretreatment Program. With this revision, inspectors will have access to guidance that reflects changes to the Pretreatment Program and compliance monitoring practices from the past 22 years, such as the 2005 Pretreatment Streamlining Rule. This Manual is not a regulation and, therefore, does not add, eliminate or change any existing regulatory requirements. While EPA has made every effort to ensure the accuracy of the discussion in this guidance, the obligations of the regulated community are determined by statutes, regulations, or other legally binding requirements.