Commercial Grease Trap Maintenance: A Guide for Restaurant Managers

A grease trap is easy to ignore between problems, but the cheapest service is usually the planned kind. This guide explains how trap cleaning, maintenance and repair fit together, what a manager can reasonably do, and how to keep it all on a schedule instead of chasing symptoms.

What trap maintenance is for

A trap's job is to intercept grease and solids so they do not travel down the drain line. Grease slowly accumulates in the unit, and everything behind that goes through the water your kitchen drains: flow rate, odours, and how much material ends up somewhere it should not be.

Maintenance is the habit of keeping the trap serviceable: emptying and cleaning it at a workable rhythm, checking that it can still be opened and drained properly, and recording what each visit found.

Cleaning, maintenance and plumbing repair are different jobs

• Cleaning removes the grease and waste that have collected in the trap. It is the core of every planned visit.
• Maintenance is the around-the-trap routine: recurring cleaning visits, checking accessibility and fittings, and reviewing what each visit found so the rhythm can be adjusted.
• Plumbing repair addresses faults in the line, venting or connected fixtures. It belongs to a licensed plumber when the cause sits beyond the trap and its accessible components.

The distinction matters when symptoms persist: if a drain is still slow after the trap has been serviced, the cause may be outside the trap entirely.

What a manager can do

You do not need to open the trap — that is the provider's work. What management controls is the schedule and the records:

• Keep the trap area accessible and free of stored equipment that blocks the lid.
• Track when the trap was last serviced and what was reported.
• Watch kitchen behaviour that loads the trap heavily: fryer changes, pre-rinsing practices, events that produce extra waste.
• Adjust the service rhythm as menu or usage changes.

Recordkeeping

A free-format log is enough. For every visit, record: the date, the service performed (cleaning, condition check or repair follow-up), the observations reported by the provider, and the next step — usually the agreed interval. Records turn a vague "it smells sometimes" into a trackable pattern and make the interval decision a data question rather than an argument.

Planning recurring service

The right interval depends on the trap size and type, how much grease the kitchen sends into it, how the drain line behaves and any local requirements that apply to the premises — your authority having jurisdiction sets any site-specific obligation. A provider who sees what a visit finds can recommend an interval from observation instead of guesswork; the interval then gets revised as usage changes.

None of this is a claim about legally required cleaning frequencies for any particular kitchen.

Questions to ask a trap service provider

• Is cleaning priced per visit or per volume removed?
• What condition issues would you report, and how quickly?
• Do you provide documentation after each visit?
• What interval do you recommend for this trap, and why?
• When would you refer a problem to a plumber instead?

When symptoms appear before the schedule

Odours, slow drainage or backups are not always dirty-trap symptoms — but they are always worth acting on. Grease Shields cleans and maintains commercial grease traps in St. John's and across the Island of Newfoundland, with repair support where the issue involves the trap or its accessible components. See the grease trap cleaning and maintenance service or request a quote. For the symptom side of that decision, read signs your restaurant's grease trap needs cleaning.