If you open the cleanout and sewage floods your yard, call a 24/7 drain specialist. The $300-$500 service fee is cheaper than replacing a broken pipe or treating a bacterial infection.
Is it a single fixture (just the toilet) or the whole house? how to unblock a sewage drain
To prevent future sewage drain blockages: If you open the cleanout and sewage floods
Soggy patches or unusually green, fast-growing grass in your yard. 2. Safety Precautions Before You Start how to unblock a sewage drain