Backwash water from a filter system is considered to be wastewater and must be properly disposed. Proper disposal methods include sending the backwash water to a sewer system or using the backwash water for surface irrigation at the reuse site. A permit issued by the sewer utility company may be required to discharge the backwash water to the sewer system.
Backwash water may not be discharged to a drywell (for example, a storm water retention basin drywell) unless an Aquifer Protection Permit has been obtained from the Arizona Department of Environmental Quality permitting such disposal. Other backwash water disposal alternatives will be considered on a case-by-case basis. For more information, please email firstname.lastname@example.org.