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Commercial Pretreatment

What types of businesses does pretreatment regulations apply?
A grease, oil, lint and/or sand interceptor shall be required for laundries, food service establishments, service stations, auto repair shops, car washes and other facilities which the Public Works Department determines are necessary for the proper handling of liquid wastes containing grease, oil, or solids in excessive amounts or any flammable wastes, sand, or other harmful ingredients.  Eating establishments include, but are not limited to restaurants, cafeterias, bars, fast food, schools, nursing homes, clubs, hotels/motels, hospitals, or any other non-private residence food service facility generating grease bearing waste going to sanitary sewer.

If the Commercial Pretreatment Regulations apply to your establishment please be aware that a General Wastewater Discharge Permit applies. Please call for more information and clarification 623-333-4402.

Does sanitary waste go through a pretreatment device?
No.  Only the waste lines that connect to the process area.  For example, in a commercial kitchen, only the three compartment sinks, floor drains, mop sinks etc. would discharge to a pretreatment device. The bathroom waste is discharged through a separate line that connects to the City Main.

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What does commercial pretreatment look like?
There are two types of pretreatment devices.

1. Hydro-mechanical Grease Interceptor (Grease Trap)
This type of device is usually required for those facilities that will have minimal fixtures being discharged and require minimal retention time. The common sizes are 50, 75, & 100 gallons.  They are typically located inside the kitchen under a three compartment sink.

2. Gravity Grease Interceptor (GGI) / Solids Separator
This type of device is required for those facilities that will have numerous fixtures being discharged and require extended retention time.  The size of a Gravity Grease Interceptor is based on the actual volume of water the interceptor will hold expressed in gallons.  Common sizes are 300, 500, 750, 1000, 1250, 1500, & 2500 gallons. Typically these GGI's are located outside, in the parking lot.
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