OK, I'm new here with a real challenge for all you plumbing pros --- I'm a dog groomer and have my shop in my garage. My husband and I built a small grooming shop last year complete with a cast iron tub raised so that I don't have to stoop over to bathe the dogs. We installed the tub so that the drainage would go into a field line in the outer backyard away from the garage & house. The garage is obviously a detached one. At any rate, all has been well for about a year when I noticed this week (after much rain) that my drain was not draining fast enough. I checked for hair clogs -- everything clear -- but when I went outside to check the pipe I noticed there was a lot of water pooled around the outside pipe going into the ground. My guess is that the yard is so saturated from the rain that the runoff from the tub was backing up. I'm a small shop and only groom about 7 dogs a day / 4.5 days a week so we didn't think it was necessary to add a septic tank or tie into the sewer line. Now we're rethinking. I live in a subdivision with city sewer. What would your recommendations be? Add a small septic tank (if restrictions allow) or tie into the sewer line via a grinder pump? I'm trying to do the most economical way as well but willing to spend what I need to do the right thing and the right way. Would like some imput. Thanks