I have sewer flies in my crawl.
They are getting into my house.I had rotor rooter come and put a camera through my sewer line.They saw no breaks,but still believe they are getting into my crawl through a crack in the line.
They want to break up the concrete and replace the sewer line at app $4500.
There are no guarantees this is the spot.If this is not where the break is,they would next want to replace the line that goes outside to the street 5o feet.This will run app $6500.
If this does not locate the source,they say they will need to look into the walls for a break!!
There is no sign of a leak!
I am at a loss of what to do.

Please if anyone knows any experts on this ,please let me know.I need to get rid of this problem before I loose my mind!

The advice you have been given is a complete rip off !
I have been infected twice.The only way I know to eliminate them is to starve them out. Cover ALL drains, install fly strips, and use bug spray where you see a swarm.
Drain flies have a life span of approximately one week. The secret is to starve them out before they can multiply. So cover EVERY drain even tub drains so they can not feed.
Good luck Tom

The advice you have been given is a complete rip off !
I have been infected twice.The only way I know to eliminate them is to starve them out. Cover ALL drains, install fly strips, and use bug spray where you see a swarm.
Drain flies have a life span of approximately one week. The secret is to starve them out before they can multiply. So cover EVERY drain even tub drains so they can not feed.
Good luck Tom