You didn't say if you have pets with them, but if so, one can assume your house and yard do too. I have battled this this year, also. As far as a natural approach, I purchased Natural Care flea and tick from WM. It can be used on pets, yard, upholstery, everything. The key to whatever treatment you use, all stages must be treated, egg, larvae, pupae, and hatched. This can and DOES take time. Also Diatomaceous Earth works well. If you can find the food grade, you can give it to your pets mixed with their dry food. I feel your pain!
try some of these tips: https://www.craftylittlegnome.com/kill-fleas-in-the-yard/
You didn't say if you have pets with them, but if so, one can assume your house and yard do too. I have battled this this year, also. As far as a natural approach, I purchased Natural Care flea and tick from WM. It can be used on pets, yard, upholstery, everything. The key to whatever treatment you use, all stages must be treated, egg, larvae, pupae, and hatched. This can and DOES take time. Also Diatomaceous Earth works well. If you can find the food grade, you can give it to your pets mixed with their dry food. I feel your pain!