What is a Significant Industrial User (SIU)?
The term Significant Industrial User as defined by the EPA means: • All industrial users subject to Categorical Pretreatment Standards under 40 CFR 403.6 and 40 CFR chapter I, subchapter N; • Any other industrial user that discharges an average of 25,000 gallons per day or more of process wastewater; contributes a process waste stream which makes up 5 percent or more of the average dry weather hydraulic or organic capacity of the treatment plant; or • Is designated as a SIU by the City on the basis that the industrial user has a reasonable potential for adversely affecting the operation of the City’s wastewater treatment plant. • What types of users are regulated under the pretreatment program? All non-domestic users that discharge to the City of Loveland’s sanitary sewer system must comply with the City’s sewer use ordinance. Users shall provide pretreatment of their wastewater as necessary, prior to discharge, to comply with the ordinance. However, users that perform processes deemed
