I think I would keep that to myself.

What Roll-Tide said. I took the course in Denton, and got certified. Turned in my paperwork to the city of Oak Point every three months.

While that's true for anybody rural, if you're in a municipality they can (and my town did) adopt local rules blocking homeowner maintenance (and/or escalating requirements to also be a 'TCEQ registered maintenance provider' ).

Glad we got out of there, now rural, and on trouble/Maintenace free conventional system (sandy soils, 1000+ ft of lines, and with elevation, no trees nearby)

Had a septic at the lake house. The 15 years we owned it, there was never an issue. I lived in it full time 7 years, my mom lived there another 7 years full time. Never had an issue whether it rained, flooded, no matter how much laundry I did, or how many people were there and showered. Granted, the house was previously owned by Phil Burleson (the attorney for Jack Ruby and Cullen Davis) and apparently he made some upgrades. The guest house had its own septic tank, but shared lateral lines with the main house and its tanks (gray water and black water tanks), and the washing machine also had its own tank with black and gray water separation. Overkill? I guess, but I loved it. We recently sold the house and I hope the new owners love the house as much as we did. The house also had separate cutoffs on the main line for every faucet in the house and all outside faucets. Made plumbing repairs easy.

Only maintenance we needed was a packet of yeast down the toilet closest to the tank once a month and maybe some sugar. Nothing special.

The house I sold in Melissa, the conventional septic system was installed in 1987. In 19 years, I had the tanks cleaned twice, and that was just for maintenance purposes. Zero trouble out of it, ever.

My BIL owns install/maintenance/pump company one of his slogan's is "We're #1 in the #2 Business" and he installs aerobic systems residential and commercial in ETX every day. Yep city/county inspection and maintenance contracts required in more and more places

Just had a septic system installed at my rural property South of Bowie. $10,000

When we bought our house at Lake Graham, the previous owner told us that they always had trouble with the septic system.
Well the house was built in 1976 and the system has 2 lateral lines. Guess what they planted a non-bearing Mulberry tree between the 2 lines about 30 feet from the tank. No wonder they had trouble. We got rid of the tree, dug up all the roots and haven’t had a problem since.

Rockwall/Rockwall County requires both.