Significant Industrial Users Permitting Program:

Discharge permits are issued to significant industrial users. The permits are valid for three years and list certain requirements and conditions that must be met in order to continue to discharge wastewater into the City sewer system. These requirements include controlling the quality of their discharge by installing appropriate treatment systems that will “pretreat” their effluent prior to discharge to the sewer system. Please refer to City Code Section 33-232 for a listing of the Significant Industrial User requirements.

Significant Industrial Users (SIU) include:

• All users subject to Federal categorical pretreatment standards under Title 40 of the Code of Federal Regulations
• Any user that discharges an average of 25,000 gallons or more a day of process wastewater into the City sewer system
• Any user that contributes a process wastestream which comprises 5% or more of the treatment plant flow

Any user designated as such a SIU on the basis that it has a reasonable potential to adversely affect the treatment plant operation or violating any pretreatment standard or requirement.