Too much fertilizer?
I'm curious about what "near the septic" means. Tank? Leach field? Other disturbance such as gravel back fill and not much topsoil in that specific area?
If the area in question is really 3' x 6' and it is over the settling tank, the concrete absorbs more water, and may have less soil over it leading to a brown area. Unlikely this year because of lots of rain, but possible. Does the snow melt faster in the same 3 x 6 area? That's the tank.
Grubs and other causes don't limit themselves to a 3 x 6 area, so I am not enthusiastic about those causes.
One other thought for a small, specific area. Wrong fertilizer.
If you used something like Scott's Step One, it contains a pre-emergent weed killer that will also be counterproductive to new seed. If you seeded in the spring, especially with a high nitrogen starter fertilizer, and then went back over the whole lawn a few weeks later, you could have put on so much nitrogen that the grass "burned out" (like dog spots. Hmmm. Do your dogs favor this area as their bathroom ?)
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