Replacing Burners, required?

[Joe Edwards-Hoff]

I have some "low income" apartments that I own. I'm slowly replacing appliances and remodeling units. 

In short- In WA state, if a single burner goes out on a range, is it mandatory to fix it? If so, how soon? 

I'm not trying to avoid ever fixing it, but if they can live with 3 working burners and a working oven, I'd rather hold out a bit longer and then replace the whole thing.