The F&B compliance guide — why councils and IWK require a grease trap, how to size it, the servicing cycle, responsible FOG disposal and the quarterly retainer, from a Klang Valley contractor.
A grease trap (or grease interceptor) is a simple, essential device that sits between a commercial kitchen’s sinks and floor drains and the public sewer. Wastewater flows in, slows down, and cools; fats, oils and grease (FOG) — being lighter than water — float and are held back by baffles, while food solids settle to the bottom, and the cleaner water in the middle passes on to the sewer. Without it, the FOG from every wash-up and wok station flows straight into the drain, cools, hardens and coats the pipe — the number-one cause of blocked commercial kitchen lines and sewer back-ups. That is why a grease trap is not optional equipment for a food business: it protects the premises’ own drains, protects the public sewer, and is a standing condition of operating a food-and-beverage outlet.
For a restaurant, café or any food premises, the grease trap is a licensing matter, not just good housekeeping. Local councils across the Klang Valley — DBKL in Kuala Lumpur, MBPJ in Petaling Jaya, MBSA in Shah Alam, MBSJ in Subang Jaya and their neighbours — require food-and-beverage outlets to install and maintain an adequate grease interceptor as a condition of the business licence, and they inspect for it. Separately, Indah Water Konsortium (IWK) operates the public sewerage system and governs what may be discharged into it — FOG-laden effluent that clogs public sewers is exactly what the trap exists to prevent. Because the precise wording, the required trap specification and the desludging expectations vary between councils and can change, the honest advice is to confirm the current requirement with your local council and IWK for your premises — then size, install and service the trap to meet it. Getting this right protects your licence at renewal and keeps inspections uneventful. Fit-out and change-of-use approvals sit alongside it; see our commercial renovation permit guide.
Neglecting the trap is a false economy that fails in four expensive ways at once. First, blockages: an overfull trap stops intercepting, FOG passes into the kitchen drain and grease line, and the pipe clogs — often mid-service. Second, smell: a trap left too long turns septic and pushes foul odour back up into the kitchen and dining area, which customers notice immediately. Third, sewer back-up: a blocked line can back wastewater up onto the food-prep floor — a health hazard and a forced closure while it is cleaned. Fourth, compliance failure: an overflowing or undersized trap fails a council or health inspection and puts the licence at risk at renewal. Any one of these costs more than a year of routine servicing; the four together are how a small saved cost becomes a closed kitchen.
Grease traps come in a range of sizes and installations, matched to the kitchen’s throughput and the space available.
| Type | Best for | Notes |
|---|---|---|
| Under-sink / stainless-steel trap | Cafés, small kitchens, single-sink stations | Compact, sits under the wash-up; serviced frequently as capacity is small |
| In-ground interceptor (concrete / HDPE) | Restaurants, busy kitchens, food courts | Larger capacity, buried outside or under the floor; pumped out by tanker |
| Above-ground poly / composite unit | Mid-size outlets where digging isn’t practical | Freestanding, larger than under-sink, easier to access than in-ground |
| Automatic grease recovery unit (GRU) | High-volume kitchens wanting less manual servicing | Mechanically skims grease; higher upfront cost, lower labour |
The right type is a function of how much FOG the kitchen produces and how much room there is — a small café and a full-service restaurant are genuinely different specifications, not the same unit at two sizes.
An undersized grease trap is almost as bad as none at all — it fills before the shift ends, stops intercepting, and lets FOG through exactly when the kitchen is busiest. Sizing is driven by the kitchen’s peak flow: the number and size of sinks and appliances discharging into it, how many covers (seats) the outlet serves, the style of food (a deep-fry-heavy menu produces far more grease than a salad bar), and the flow rate the trap must handle without letting grease escape. Councils and the trap manufacturer both publish sizing bases, and a competent installer works from the actual fixtures and throughput rather than guessing. The goal is a trap large enough that it is still intercepting at the end of the busiest service, with a servicing cycle that empties it before it approaches full. Get the size right at installation and the whole compliance-and-blockage problem largely takes care of itself.
The cheapest time to get the grease trap right is during the fit-out, before the kitchen floor and drainage are finished. Designing it in from the start means the trap is correctly sized for the planned menu and covers, sited for easy servicing access (a trap you cannot reach is a trap that does not get cleaned), and plumbed so every FOG-producing fixture runs through it while non-greasy waste does not needlessly load it. Retrofitting a trap into a finished kitchen — because an inspection flagged its absence — almost always costs more and works worse than building it in. New restaurants and cafés planning a kitchen should treat it as core infrastructure alongside the exhaust, gas and drainage; our restaurant fit-out guide and café fit-out guide set the wider scope, and Bomba and other compliance items are covered in our fire-safety / Bomba guide.
The right cleaning frequency is the one that empties the trap before it stops working — and that depends entirely on how hard the kitchen runs. A general rule of thumb is that a trap should be serviced before it is about a quarter full of grease and solids; in practice a busy restaurant may need its under-sink trap serviced weekly to monthly, while a larger in-ground interceptor at the same outlet is pumped out quarterly. A quiet café produces less FOG and can go longer between services. The wrong approach is to wait until it smells or blocks — by then it has already failed. The reliable approach is a fixed cycle set from the trap size and the kitchen’s load, adjusted after the first few services once the real fill rate is known. Confirm any minimum servicing interval your council or IWK specifies for your premises.
Emptying a grease trap properly is more than skimming the top. A full service removes the floating grease layer and the settled food-solid sludge at the bottom, scrapes down the baffles and walls where grease cakes on, inspects the baffles and inlet/outlet for damage or bypass, refills or resets the trap as required, and — crucially — removes the collected FOG waste for proper disposal rather than tipping it into another drain. A half-service that skims the grease but leaves the bottom sludge simply shortens the time to the next blockage. Good operators also keep a service record: the date, what was removed, the condition of the trap. That record is exactly what a council or health inspector wants to see, and it is the paper trail that shows the premises is maintaining its interceptor as required — useful evidence at licence renewal.
What comes out of a grease trap is regulated waste, and where it legally goes matters as much as getting it out. FOG waste must not be poured back into any drain, the sewer or a watercourse — doing so simply moves the blockage downstream and can breach discharge rules. A proper grease-trap service collects the waste and disposes of it through appropriate, licensed channels. For an operator, the practical point is to use a service provider who removes and disposes of the waste responsibly and can account for it — not one who quietly empties your trap into the nearest manhole. Responsible disposal is part of what you are paying for, part of what keeps you compliant, and part of what protects the public sewer that IWK maintains on everyone’s behalf.
Grease-trap cost splits into routine servicing and one-off installation, and both scale with size. Honest 2026 Klang Valley bands, not a fixed quote (market estimate):
| Item | Indicative price | Notes |
|---|---|---|
| Under-sink trap clean (per service) | RM150 – RM400 | Small capacity; frequency depends on kitchen load |
| In-ground interceptor pump-out | RM400 – RM1,200+ | Tanker service; volume and access drive it |
| Under-sink / stainless-steel trap supply & install | RM500 – RM2,000 | Size and grade dependent |
| In-ground / large interceptor install | Quoted per project | Excavation, unit size and plumbing tie-in |
| Quarterly service retainer | Quoted per premises | By trap size and servicing frequency |
Set the servicing cost against what it prevents — a blocked grease line cleared mid-service, a sewer back-up onto the kitchen floor, or a failed inspection at licence renewal all cost far more than a scheduled clean. Market estimate figures only; trap type, size, access and load move every number.
For most food businesses the sensible model is not to remember the grease trap — it is to put it on a retainer and stop thinking about it. A scheduled service agreement, timed to your trap size and kitchen load (from weekly under-sink attention to quarterly interceptor pump-outs), means the trap is always serviced before it fails, the disposal is always handled properly, and the service record is always up to date for an inspector. It converts an unpredictable emergency — the blocked line at Saturday dinner, the smell the customers noticed, the surprise at renewal — into a small fixed cost you can budget. For a multi-outlet operator it also means one provider, one standard and one paper trail across every site. ClickBina quotes grease-trap retainers per premises, and pairs them with kitchen-line jetting where the drain needs it too.
The trap and the drain line are two halves of the same job, and neglecting either undoes the other. The grease trap intercepts most of the FOG, but some always slips past and, over weeks, films the kitchen drain and grease line downstream — which is why a serviced trap still needs the line cleaned periodically. Conversely, jetting the line while ignoring an overfull trap just means the line re-fouls fast. The complete solution for a commercial kitchen is both: a correctly sized, regularly serviced grease trap, plus scheduled hydro-jetting of the kitchen drain to strip whatever gets through back to bare pipe. Run together on one schedule, they keep a busy kitchen off the emergency-plumber cycle entirely. For the surface- and floor-drainage side of a commercial premises, our sump pump & drainage guide is the companion, and hidden supply leaks are covered in the concealed pipe leak detection guide.
ClickBina installs, sizes and services grease traps for restaurants, cafés, food courts and commercial kitchens across the Klang Valley — correctly sized for your covers and menu, sited for easy servicing, cleaned on a schedule that keeps you ahead of blockages and inspections, with responsible FOG disposal and a service record you can show an inspector. We handle the whole commercial-kitchen plumbing picture, from the trap to drain-line jetting to general plumbing, and quote quarterly retainers per premises. Tell us your outlet type, covers and whether you’re fitting out or already trading, and we’ll size, price and schedule it — and always suggest confirming the exact spec with your council and IWK.
Tell us what you need — we reply within the hour.