What to write down after the truck leaves
Gallons pumped, the date, and whether the lid was buried. That note is the next interval.
The useful record is the date, the gallons the truck took, and how hard the lid was to find. Wes asks the caller to keep the invoice.
The next planning date starts from that pump, not from the year the house was built, unless nobody has a record.
A company on the $99 plan can keep those notes on the job. The homeowner still owns the tank.