How did dirt win into my sink? My gutters run into my main drain and one time when it...

My gutters run into my main drain and one time when it rain i found dirt in my laundry tubs. This historic week it rained abundantly and I did not find any dirt in any tubs. Then when i run the dish washer i found dirt in the kitchen sink. It have only happen twice in times past 2 years. It doesn't seem to be a big problem the drains still work fine. Or is it a bigger problem?
Answers:    You hold a partial plug in your sink drain smudge. You should snake it out or use a chemical drain cleaner before it get worse and runs your sink over when then dishwasher drains.

Bert
your drain pipes are protection up into your water supply.