James Heath (979) 777-3759 Used him for years. Very honest and reasonable. Goes above and beyond. All our neighbors and friends use him as well. Had Aggieland Septic before and canceled our contract with him. Overpriced and not trustworthy.
Heath installed the one out at my new house and though there's been a few issues (failed pump, etc), they've been very quick to come resolve.
Nice people and fun to chat with, though I think the son mentioned to me they were getting out of the residential septic business at some point (but maybe I heard wrong).