from Wikipedia

---8<--- The property had a rudimentary sewage storage solution in the form of a buried cement mixer left by the previous owners.[8] The cost to update the sewer system would be nearly double the $42,000 Heemeyer paid for the property.

City officials told Heemeyer that putting in a septic tank was a less expensive alternative, but he rejected both options and said that the government not paying for the sewage line hookup was "extortion by government fiat".[8] Despite these setbacks, he did not withdraw his annexation request and subsequently became part of the sewer district.[8] --->8---

Seriously the whole thing is stupid, the community had a problem with sewage, he decided that since his sewage wasn't his problem someone else should pay for it, they bent over backwards to accommodate him despite that. Giving him extensions and options and he decided rather than live in a society he'd rather spend time and money making a suicide bulldozer....