My darkroom is in the basement, and I share water source with the laundry area. I develop film and wash prints in the utility sink there.
We have three cats, so I thoroughly clean the area after each use, using tray cleaner or Permawash on spots of chemicals, and then wash the sink down and mop the floor. I don't think it's actually necessary because I'm very careful when I work, but it helps keep the place tidy and sanitary.
I would not use photography chemicals in the kitchen. If not for health reasons, then at least for peace of mind.