A full house on a holiday is a different tank
Extra showers and a dishwasher running all weekend can surface a tank that was fine in June.
Wes asks how many people are in the house this weekend, not just who lives there. Eight guests in a three-person tank can push a marginal system over the lid.
The interval tool still uses the usual household. The urgent flag comes from the symptom: slow drains, odor, or water at the lid.
Book the truck before the guests leave if the yard is already wet. The five-year date can wait.