City Update logo-square

 **COVID-19 Response**   The following official announcements have been made by the city in regards to the COVID-19 (Coronavirus)   In an effort to minimize the visits to City Hall, please use our online services for paying your water bill

Avondale is following guidance provided by the state Governor’s Executive Orders: Effective Sunday, June 21, 2020 the wearing of face coverings by employees and customers will be required in all city facilities,  retail establishments, convenience stores, grocery stores, pharmacies, gyms, indoor sports or activity facilities, and medical offices. Additionally, these businesses will be required to post notice of these requirements at their entrances. (see more: COVID-19 Response)


Commercial Pretreatment & BMPs

Press Enter to show all options, press Tab go to next option

What types of businesses does pretreatment regulations apply?

A grease, oil, lint and/or sand interceptor shall be required for laundriesfood service establishmentsservice stationsauto repair shopscar 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 restaurantscafeteriasbarsfast foodschoolsnursing homesclubshotels/motelshospitals, 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.

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.


Best Management Practices 


Grease in the Kitchen Poster

Car Wash

Grease Interceptor

Spill Kit

Oil and Antifreeze

Commercial Mop Water