Oklahoma rules (OAC 252:641-10-3) require the installer of a new aerobic system to maintain it for two years at no extra cost to the owner, including the inspection and testing duties listed in the rule.
After those two years, the owner is responsible for keeping the system working — by maintaining it themselves or by hiring someone. A forever paid maintenance contract is not a statewide mandate.
Some cities add local paperwork. The City of Edmond requires builders of new residential properties with aerobic systems to provide a two-year maintenance agreement, under City Ordinance No. 3477, 21.03.091 Section 3. After two years, the homeowner must give the city yearly verification of continued professional inspection and maintenance. Apply that ordinance only inside Edmond city limits. A mailing address that says Edmond does not, by itself, prove the house is inside those limits. Check your city; do not assume every town matches Edmond. Source: City of Edmond, Aerobic Treatment Maintenance.
Optional service agreements still make sense for many owners: chlorine residual, sludge depth, spray-head function, and faster help when an alarm trips.
Keep written notes. A later buyer, a city clerk, or a repair tech will want dates, sludge readings, and who did the work. This directory does not store those records for you.
If you hire help, ask what each visit includes and whether they cover your Oklahoma address. Installation credentials and ongoing maintenance are related, but they are not the same promise.
Quick answers
Who maintains a new aerobic system in Oklahoma?
Under OAC 252:641-10-3, the installer maintains a new aerobic system for two years at no additional owner cost. After that, the owner maintains it or hires someone. Inside Edmond city limits, City Ordinance No. 3477 requires a two-year maintenance agreement for a new home, then yearly proof of professional inspection and maintenance.
Does Oklahoma require a paid contract forever?
No. After the first two years, a forever paid contract is not a statewide mandate. Some cities add paperwork. Confirm the property, not just the postal city.
Does an Edmond mailing address prove the city rule applies?
No. Confirm the property is inside Edmond city limits before applying that local note.
Use the directory as a starting point.
Ask the company to confirm your system type, exact task, property coverage, timing, and price. A directory record does not replace an on-site evaluation.