My home is approx 10 yrs. Old. We have added additional drain field, last year, and have had the septic tank flushed twice this year, we are stiill getting this toxic/sewer smell in our home when it rains heavy. Should we call a plumber to check the vents? We are in desperate need of HELP!!

Wow, yes, if the problem is that bad, then yes, why did you wait to ask here. I would call a plumber immediately to get rid of anything toxic

Any backups during a hard rain? Where does your rain water runoff go to? Let me know, Tom

Tell us why the additional field was needed, tanks are not flushed, just pumped. Pumping a tank twice in one year is not necessary unless there is some other problem you/we do not know about. Pumping every 5-10 for a family of 4 is all that's needed