We have what I think is a rat, or family of rats, that are coming out of an outdoor drain. The outdoor drain is connected into our interior drain system. They chewed through the drain cover, I replaced it and they came through again.
I am in DC so the city sewer system is connected to the surface rain water system and rats are a known problem.
I am worried that sealing the drain in a more aggressive fashion will result in the rats coming out someplace else and would prefer that not to be in my house. The basement drains and plumbing are all buried in the foundation slab and connect to the main drain stack below the main clean out.
What is the proper solution to handling this?