The way most septic systems work to my knowledge is what is a 2 tank system. The solids fall into the first tank and the liquids spill over into the second thank. From there the liquids will go out into the leach field. It is dry enough here in Colorado that you can noticeably see how the grass is greener over the leach filed. That is probably why you think it is draining into the backyard. Just a friendly word of advice, know where your septic tanks lids are and get them pumped as a precautionary measure when you move in.
Anyways, back to the subject at hand,
I`ve personally had really good luck with just plain concrete. I really wish i had a drain in my garage, especially in the winter when the snow melts off the cars and pools up. I`m not sure what it takes to put in a drain in Virginia, but if you are going to do it to code, do it right, trust me it will pay off. If the inspector is a real A$$, he could make you rip it all up and do it again.
My $0.02
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