Septic services explained
Pumping
Removes the settled sludge and floating scum from the tank. Many companies suggest every 3 to 5 years for a typical household, more often for larger households. On aerobic systems, DEQ rules say the trash tank should be pumped before sludge reaches 40% of its depth (DEQ aerobic systems fact sheet).
Inspection (home purchase or problems)
Oklahoma does not license septic inspectors or require an inspection at sale (OSU Extension: Basic Septic System Rules for Oklahoma). Some companies offer a records search of DEQ files plus an on-site inspection with pumping. Ask what is included and whether the tank will be pumped and opened.
Aerobic system maintenance
Aerobic treatment units (common with spray sprinklers in the metro) need regular checks of chlorine, sludge and the pump tank. See the aerobic guide.
New installation or replacement
Requires a soil test or soil profile, a DEQ authorization to construct, and an inspection before backfill. The system type (conventional lateral field, aerobic with spray or drip, lagoon) depends on soil and lot size (Oklahoma DEQ sewage treatment page).
Repair
Repairs and modifications are also inspected by DEQ unless done by a certified installer who self-inspects (OSU Extension: Basic Septic System Rules for Oklahoma).
What to ask any company
- Are you on the DEQ list of active certified installers (for installs and repairs)?
- Is the quote all-in: disposal, digging up lids, mileage?
- Who handles the DEQ paperwork and inspection?
- Written warranty and, for aerobic systems, written maintenance terms.