[LAL426]

I moved into my newly built house at the end of last year. We have a four bedroom house with a 1250 gallon spetic tank. We have two children who are still too young to use the toilet (in diapers). Both of us work so we do not use the toilet all that often here. For at least the last couple of months whenever it rains heavy we have a very distinct septic odor smell in the house. The smell goes away completely about 2 days after it starts raining. It only smells in a really heavy rain. Any ideas as to what this is? Could it be a major issue? I would think that the system does not need to be pumped yet. Thanks for any replies