Need a recommendation from my small, intimate (I like it that way!) Facebook community. I do not have access anymore to my long time plumber that I trusted with my home's digestive system for 20 years. I originally thought this was an MSD issue, because this problem only started with the last heavy downpour of rain. Funky drain in the back yard that hooks into the house is overflowing, especially when the washing machine and dishwasher drains. Doesn't seem to be sewage...but a very unhappy smell, perilously close to the gold fish pond. MSD says the main is open and clear. Please give me your best suggestions...especially you, city dwellers. My home's internal organs thank you!!!! My wallet wants to also thank you..................