What Businesses are Considered to be Significant Industrial Users?

The following types of businesses are considered to be SIUs:

• Businesses engaged in operations identified as categorical processes by the EPA. These categorical processes include:
  • Electroplating
  • Metal finishing
  • Nonferrous metals forming
  • Battery manufacturing
• Businesses that discharge 25,000 gallons per day or more of process wastewater.
  • The only exception is if the District has found that the business has no potential to violate local pretreatment standards including Local Limits.
• Businesses, regardless of size, whose discharge has the potential to adversely affect the operations of the District or its connectors. This includes such facilities as:
  • Large food processors
  • Large rendering plants
  • Large film processing facilities
  • Groundwater remediation projects including leaking underground tank cleanups

Note: Individual film developers are not regulated as SIUs at this time.