The waste discharged from a single family home is different than waste discharged from a small office building, just as the waste from a small office building is different than a restaurant. A general rule of thumb is that the greater the volume of flow, and the greater the amount of food waste in that flow discharge, the greater the fees.
For example, data collected from sampling of wastewater shows that restaurants have a greater impact on our treatment plants than most any other type of business. Restaurants serve food on plates and cook with pots and pans. Imagine cooking 50 dinners for your family each night and how much more dish washing you would have to do, how many more sinks you would have to have, and how many more times people would use the restroom.
Restaurants are broken down into different categories based on types of food service and equipment installed. Categories include full service restaurants (use lots of pots, pans, and plates) to fast food, pizza parlors, and low impact places like sandwich shops. The fees vary per category. Full service restaurants are typically the most costly.