Arrived to the home, client states there are drain flies throughout the home, mostly in the bathroom group. When I went into the kitchen I did discover a few but not many flies near the kitchen sink. I ran the faucet to check for leaks, and there are no leaks under the kitchen sink. I next went into the only bathroom group and ran fixtures and checked for leaks to, again, no leaks are found. I flushed the toilet numerous times to check for leaks at the base and there are no visible leaks in the home that I can locate at this time. I next went into the crawlspace to check for any leaks, broken drain pipes, etc. There are no active leaks in the crawlspace and no leaks coming from any drain piping. I asked the client if they have had any weird smells recently and they stated only in the garage near the washing machine. There is an intense smell of mildew in the washing machine and drain flies are discovered there as well. From a plumbing stand point, I am not seeing any issues with water