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In plumbing and building codes, oil separators are devices used to prevent oil and grease from entering the wastewater system, which can lead to issues such as blockages and environmental contamination.

Residential buildings generally do not have substantial amounts of oils or greases in their wastewater; thus, they are typically not required to install oil separators. In commercial settings, such as parking garages, coffee shops, and especially manufacturing plants, it becomes essential to manage oily waste to maintain the integrity of the sewage system.

A commercial parking garage storing automobiles, however, typically focuses on dealing with vehicle-related discharges that may contain oil. Many jurisdictions understand that while these facilities should have good waste management practices, the specific need for an oil separator may not be mandated because the oil accumulations are usually minimal compared to those in food service and industrial environments.

Coffee shops frequently prepare food and beverages, which can lead to higher levels of grease and oils in their wastewater, necessitating oil separators to comply with local regulations. Manufacturing plants most certainly deal with oils and grease due to their operational processes, hence the requirement for oil separators to manage environmental impacts effectively.

In summary, the lack of a significant risk of oil contamination in a commercial parking garage is what typically exempts it from