Q. What should I do if my sewer is blocked and how can I prevent it?
A. Stop using any water in the house, such as sinks, showers, washing machines and dishwashers. If water cannot get through your house connection lateral line to the main sewer line in the street, it will back up into your house. To prevent this, keep grease fats and oils out of the sewer system. Grease coats the inside of the sewer lines in your home and clogs the pipes in your line and the sewer line in the street.
Says the county will do inspection to help keep GGFs (grease generating facilities) in compliance. This also outlines BMPs.
Baltimore County Regulations which address grease abatement. Says control equip may be required if BMPs are insufficient. And that the Grease interceptors must be maintained and grease must be hauled peridoi periodically but says nothing about inspections or minimum time between hauling grease
very vague
oils or greases, including those of animal and vegetable origin, are of the nature that they will solidify at temperatures of normal sewage and it is probable that they will collect in the sewer lines and contribute to clogging or, if non-petroleum oils and greases, can overload skimming and grease handling equipment or interfere with the treatment process, restrictions on discharge concentrations may be required