All of a sudden last night my tub filled up with water from the drainage. I do not know where the water is coming from and why. My toilets are also stuck but its filled with only clear water. What can I do to fix this?

I know there's a few other thread on here that are similar, but none were quite the same. We've been renting a house from friends since May, and within the past couple months we've had the toilet overflow 3 times, we've found the tub with black gunk and water backed up into it (not sewage), and...

Whenever I run the laundry washer, which is downstairs, the upstairs bathroom's toilet and tub begin to overflow and back up with dirty water. I have checked to see where the washer drains to and it goes directly into the sump pump. I do have city lines as well. The main line has been snaked...

I was washing the other day and heard water running. The toilet and bath tub was filling up with water. Went out to garage and washer drain was making a gurgling sound. Was wondering what I should do to fix this? This has never happened before. Carol