When I drain river, I can hear dampen coming out/up other drains/toilets surrounded by my house...why? ...
sounds like you hold a backup in your fundamental sewer line or you enjoy a blockage in your sewer vent..It's pretty involved so I would send for a plumber or rooter guy unless you're pretty handy with a massive diameter snake and want to spend the time to find the blockage
If you enjoy a septic tank, it might be time to own it pumped out. Try and take attention of this right away. We had this occur once and it's not funny when 4 toilets simultaneously "explode" and send sea all over your house. I be the only one home and by the time adjectives toilets were shut down in that was comparatively a mess. We also had to replace the carpeting within one bedroom.
Best of Luck to You!
Answers: probably your drains are not vented properly.