Reporting Requirements for Categorical Industrial Users (CIUs)

A facility that meets the criteria of a categorical industrial user (CIU) is required to comply with all federal, state, and local pretreatment requirements. To demonstrate compliance, a CIU needs to submit reports, self-monitor their wastewater discharge, and maintain records.

The following types of reports are required under 40 CFR §403.12:

• baseline monitoring report (BMR) - must be submitted 90 days prior to discharge

• 90-day compliance report (compliance with categorical pretreatment standards report) - must be submitted 90 days after discharge begins

• periodic compliance report (at least once every six months)

• others may include:

• compliance schedules and reports

• notification of potential problems, including slug loading

• notification of process or pretreatment changes

• notification of hazardous waste discharges

• pollutant management plans