Every morning we have a poo odor in our house. When it first began I had my tank drained because in the past that was a sign it needed drained. But I am still having the issue. What could the problem be do I need to replace the valve?

Do any of your fixtures bubble when you flush ot the washer discharges? Let me know, Tom

Cpould you more fully explain "drained because in the past that was a sign it needed drained" What was the original issue that caused you to think the tank required pumping? Is the odor everywhere or just in one room like kitchen or bathroom?