If I could count the times I've heard someone say that to me....
A health inspector generally enforces civil laws not criminal laws and therefore does not need a warrant to enter property, a complaint, or the mere fact that a person has a permitted (or permit requiring) facility (i.e. a septic tank) is reasonable cause. Having been there and done that, the health inspector brought the Sherrif not to inimidate but for protection of her person due to the gentleman having been his charming self the previous day. Don't know about her state but if I saw the condition of that fellow's property in the video, I would investigate too. Most states have "right to enter" clauses somewhere in the health and/or environmental codes.

