Probably a bad waste shaft or sewer connection, and to reach the phone number of a good company is a real thing. A sudden catastrophe might not come so quickly if you try to prevent it as soon as possible. Calling fast emergency service in your city or in the vicinity is the right solution to be offered. And with its help to quickly remove the unfriendly state. Don't forget the review, and you'll be done. Perhaps to your full satisfaction!
For your house building
Revisions and audit reports from all possible experts and inspectors are required for completion. Otherwise you cannot live, but without approval it is not possible. The first thing to do is to invite those who will say the eagle over whether the water and sewer connection is properly processed.