When Is a Grease Trap Mandatory in the UAE?
A grease trap is mandatory for every commercial kitchen in the UAE — including restaurants, cafeterias, hotels, food courts, bakeries, and catering facilities — before drainage connects to the public sewerage network. Under Local Order No. (8) of 2002 (Concerning Sewerage, Irrigation and Water Drainage in the Emirate of Dubai), all private sewerage networks that generate fat, oil, and grease (FOG) waste must install an approved grease trap. The same obligation applies across Abu Dhabi under Abu Dhabi Sewerage Services Company (ADSSC) technical guidelines and in Sharjah under Sharjah Municipality drainage authority requirements.
The requirement is not optional or size-dependent: even a small single-outlet juice bar must comply. Dubai Municipality (DM) may permit a new food establishment to begin operations before the unit is physically installed, but only if a security deposit is paid and the installation is completed within 45 days of the operating authorisation. After that window, penalties apply immediately.
All grease discharged to the drainage system is strictly prohibited under UAE law. Fines range from AED 5,000 for first offences to AED 500,000 for serious or repeated violations, and non-compliance can trigger suspension of the trade licence. If you are fitting out a new restaurant, confirming your grease trap specification early is one of the most consequential steps in the MEP design process — see our restaurant MEP engineering service for end-to-end support.
How to Size a Grease Trap: Methods and Formulas
Grease trap sizing in the UAE is based on peak wastewater flow rate and a minimum 30-minute grease retention time. Three calculation approaches are accepted; Dubai Municipality 2021 technical guidelines reference the flow-rate method as primary, while international codes such as the Uniform Plumbing Code (UPC) provide the fixture-unit and seating-capacity alternatives.
1. Flow-Rate Method (Dubai Municipality Primary Method)
Calculate the peak flow rate in litres per second (l/s) from all fixtures discharging grease-bearing wastewater: pot sinks, wok ranges, combi ovens, dishwashers. The minimum trap volume is:
- Required capacity (litres) = Peak flow rate (l/s) x Retention time (seconds)
- Retention time minimum: 30 minutes (1,800 seconds)
- Example: 2 l/s peak flow gives 2 x 1,800 = 3,600 litres minimum
Dubai Municipality requires this calculation to be documented and submitted with drainage plans on the municipality application form.
2. Fixture-Unit Method (UPC / International Codes)
Assign Drainage Fixture Unit (DFU) values to each fixture using UPC Table 702.1, sum the total, then cross-reference UPC Table 1014.3.6 to determine interceptor size. This method is widely used by MEP consultants and is accepted by UAE authorities when accompanied by stamped engineering drawings.
3. Seating-Capacity Formula
For quick estimates during concept design, the seating-capacity approach is useful:
- Tank size (gallons) = Meals per peak hour x Waste flow rate factor x Retention time factor x Storage factor
- Waste flow rate factors: 6 gallons per meal (with dishwasher); 5 gallons per meal (without dishwasher); 2 gallons per meal (single-service or disposable cutlery only)
- Retention time factor: 2.5 (standard 30-minute retention)
- Storage factor: 1.0 to 1.5 depending on cleaning frequency
As a broad reference, industry guidance aligned with Dubai Municipality suggests: small cafes and coffee shops — 20 to 50 litres; standard restaurants — 50 to 150 litres; high-volume operations such as hotel kitchens and food courts — 150 litres and above, with industrial installations often exceeding 1,000 litres. Always verify against the flow-rate calculation; these ranges are indicative, not regulatory minimums.
Accurate sizing requires an on-site assessment of your drainage layout, menu type, and peak service covers. Our restaurant kitchen design team prepares full FOG load calculations as part of every kitchen design package.
Above-Ground, In-Ground, and Grease Interceptor: Which Do You Need?
UAE authorities recognise three physical configurations. The correct choice depends on flow rate, available floor space, and the specific municipality approved product list.
Above-Ground (Hydromechanical) Grease Traps — Dubai Municipality Type A
Compact units installed directly beneath or beside a single fixture. Dubai Municipality classifies these as Type A: flow rate 1 to 5 l/s, depth 450 mm, GRP cover (1,070 x 820 x 15 mm), removable perforated PVC bucket with a 5 mm neoprene gasket seal and brass wing-nut fasteners. They suit small cafes, juice bars, and single-sink installations. Because they fill quickly, they require the most frequent maintenance. Dubai Municipality mandates cleaning when the trap reaches 25% full, which in a busy kitchen can mean weekly service. For a full maintenance schedule guide, see our article on grease trap cleaning frequency in the UAE.
Floor-Mounted and Shallow In-Ground Units — Dubai Municipality Type B
Type B units handle 5 to 25 l/s and are suitable for mid-sized restaurants, central kitchens, and bakeries with multiple fixtures. Constructed from AISI 304 stainless steel or HDPE, these units are placed in the kitchen plant room or just outside the back-of-house drain channel. The AG Series stainless steel models commonly used in the UAE range from 53 litres (AG1, 27 l/min) up to 1,134 litres (AG5 industrial, 567 l/min).
In-Ground Gravity Grease Interceptors — Dubai Municipality Types C and D
Required for hotels, malls, food courts, and any operation generating more than 25 l/s of FOG-bearing wastewater. Type C and D units are deep in-ground gravity interceptors in HDPE, fibreglass-reinforced plastic (FRP), or reinforced concrete. They require excavation and provide substantially greater holding capacity between service intervals. In-ground interceptors should be positioned where a vacuum tanker can reach the access lid without moving equipment.
Material Standards
DM-approved materials include AISI 304 stainless steel, UPVC, GRP, HDPE, reinforced concrete, and neoprene gaskets (5 mm minimum). The internationally referenced testing standards are ASME A112.14.3 and PDI G-101 (2017) for hydromechanical units, and EN 1825-1/EN 1825-2 for gravity interceptors. Confirm that any unit you specify appears on the Dubai Municipality approved products register before ordering.
Dubai Municipality Approval Process
Only contractors holding Activity Code 900017 — issued by Dubai Economy and licensed under Dubai Municipality — are authorised to install grease traps in Dubai. Using an unlicensed contractor voids the DM compliance certificate and exposes the operator to direct liability.
The eight-step approval process:
- Site assessment — licensed engineer evaluates drainage layout, kitchen flow, and menu type to determine correct sizing
- Sizing calculation — peak flow rate calculation documented per DM formula
- Municipality application — submission of installation paperwork with site plans and drainage diagrams to DM Building Permits Department
- Unit selection and supply — only DM-approved models with valid warranty documentation are permitted
- Professional installation — Activity Code 900017 contractor completes connections at correct pipe gradients (minimum 1:40, approximately 2.5% slope)
- Flow testing — full-capacity water tests verify functionality and grease capture efficiency
- DM inspection — Dubai Municipality engineers conduct an on-site inspection
- Handover and documentation — operator receives DM compliance certificate, installation report, unit warranty, and maintenance schedule
The compliance certificate is required for restaurant licence issuance and renewal and for passing the Dubai Municipality restaurant inspection. Keep all documentation on-site as inspectors may request it at routine visits.
Installation and Placement Rules
Correct placement is as important as correct sizing. A well-sized unit installed too far from the source will trap solidified grease in the connecting pipework before it reaches the interceptor.
- Position as close to the grease source as possible. The longer the pipe run between cooking fixtures and the trap inlet, the greater the risk that grease cools and solidifies in the line.
- Pipe gradient: All inlet pipes must slope toward the trap at a minimum gradient of 1:40 (approximately 2.5%). This applies to both under-sink connections and longer runs to in-ground units.
- Individual trapping and venting: Each fixture discharging into a grease interceptor must be individually trapped. A vent is required downstream from the interceptor to prevent negative pressure that could pull the water seal and allow sewer gases into the kitchen.
- Access for maintenance: The unit must be accessible for pump-out without moving equipment or breaking through fixed structures. In-ground units should be positioned where a vacuum tanker can reach the access lid. Cover lids must be removable without specialist tools for routine inspection.
- Traffic and load: In-ground units installed below loading areas or car parks must be rated for the relevant wheel-load class and protected by a suitable cover frame.
- Potable water separation: Maintain separation from potable water lines per standard plumbing code requirements to prevent cross-contamination.
For ongoing compliance after installation, our restaurant grease trap cleaning service covers all UAE emirates with DM-certified technicians and digital compliance records.
How Requirements Differ Across Dubai, Abu Dhabi, and Sharjah
The underlying obligation — grease traps mandatory for all commercial kitchens — is consistent across all seven emirates. However, sizing methodology, approval authority, and administrative process vary significantly.
Dubai
The most prescriptive regime. Governed by Dubai Municipality under Local Order No. (8) of 2002 and Administrative Order No. 181 of 2007 (FOG waste). Installation requires an Activity Code 900017 contractor, a DM application with drainage drawings, and a post-installation DM inspection before the compliance certificate is issued. DM maintains an approved product register; only listed models may be installed. FOG waste must be disposed of through DM-approved waste management companies registered on the FoodWatch digital platform.
Abu Dhabi
The sewerage authority is Abu Dhabi Sewerage Services Company (ADSSC). ADSSC technical guidelines specify capacity based on a wastewater throughflow formula with three grease-accumulation categories:
- Small accumulation: 100 litres per l/s wastewater throughflow
- Normal accumulation: 200 litres per l/s wastewater throughflow
- Large accumulation (hotels, industrial catering): 300 litres per l/s wastewater throughflow
The design basis is double the peak wastewater flow, and the interceptor should maintain a width-to-length ratio of 1:1.8. Food business approvals in Abu Dhabi also involve Abu Dhabi Agriculture and Food Safety Authority (ADAFSA). The ADSSC per-litre-per-second capacity formula is distinct from Dubai retention-time sizing; projects spanning both jurisdictions require separate calculations.
Sharjah
Sharjah Municipality drainage department (Industrial Area 5) issues the grease trap fixing certificate. The unit must be installed as close as possible to the premises outlet and must remain readily accessible. The certification process includes removing overflow, scheduled cleaning and washing of baffles, testing inlet and outlet flow, and inspecting the trap body. Operators must obtain the fixing certificate from Sharjah Municipality before the food establishment licence is confirmed.
Northern Emirates
Ajman, Ras Al Khaimah, Fujairah, and Umm Al Quwain each administer requirements through their own municipality offices. In practice, these authorities broadly follow the Dubai Municipality framework and accept DM-approved product specifications. Confirm requirements with the local municipality during the fit-out permit stage.
FAQ
What size grease trap does a 50-seat restaurant in Dubai need?
There is no single fixed answer because size depends on peak flow rate, not seat count alone. Using the seating-capacity formula as a starting point: estimate peak hourly covers (typically 30 to 40 percent of total seats), multiply by 6 gallons per meal with a dishwasher, apply a 2.5 retention factor, and add a storage factor of 1.0 to 1.5. For a 50-seat restaurant, a capacity in the range of 500 to 900 litres is common, but this must be confirmed by a licensed MEP engineer against your actual drainage fixture loads before the DM application is submitted.
Can I install a grease trap myself in Dubai?
No. Dubai Municipality requires all grease trap installations to be carried out by a contractor holding Activity Code 900017. Using an unlicensed installer means the installation will not pass the DM inspection, no compliance certificate will be issued, and the restaurant cannot obtain or renew its food licence. The contractor must also submit the municipality application, drainage drawings, and flow test results on your behalf.
What is the difference between a grease trap and a grease interceptor under UAE rules?
Both terms describe devices that separate FOG from wastewater before it enters the public sewer. In UAE practice, grease trap refers to smaller above-ground or shallow hydromechanical units (Dubai Municipality Types A and B, handling up to 25 l/s), while grease interceptor refers to large in-ground gravity units (Types C and D) used in hotels, malls, and food courts. The correct category is determined by the peak flow rate calculation.
Do grease trap requirements differ between Dubai and Abu Dhabi?
Yes. Dubai Municipality uses a retention-time-based sizing formula (peak flow rate multiplied by 30-minute retention), while Abu Dhabi ADSSC uses a capacity-per-litre-per-second throughflow formula with three accumulation tiers (100, 200, or 300 litres per l/s). The approval authorities also differ: Dubai requires Activity Code 900017 contractors and a DM post-installation inspection; Abu Dhabi submissions go through ADSSC with ADAFSA involvement for food businesses. Always use emirate-specific calculations as a unit sized to Dubai specifications may be undersized or oversized for an Abu Dhabi site.
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When Is a Grease Trap Mandatory in the UAE?
A grease trap is mandatory for every commercial kitchen in the UAE — including restaurants, cafeterias, hotels, food courts, bakeries, and catering facilities — before drainage connects to the public sewerage network. Under Local Order No. (8) of 2002 (Concerning Sewerage, Irrigation and Water Drainage in the Emirate of Dubai), all private sewerage networks that generate fat, oil, and grease (FOG) waste must install an approved grease trap. The same obligation applies across Abu Dhabi under Abu Dhabi Sewerage Services Company (ADSSC) technical guidelines and in Sharjah under Sharjah Municipality drainage authority requirements.
The requirement is not optional or size-dependent: even a small single-outlet juice bar must comply. Dubai Municipality (DM) may permit a new food establishment to begin operations before the unit is physically installed, but only if a security deposit is paid and the installation is completed within 45 days of the operating authorisation. After that window, penalties apply immediately.
All grease discharged to the drainage system is strictly prohibited under UAE law. Fines range from AED 5,000 for first offences to AED 500,000 for serious or repeated violations, and non-compliance can trigger suspension of the trade licence. If you are fitting out a new restaurant, confirming your grease trap specification early is one of the most consequential steps in the MEP design process — see our restaurant MEP engineering service for end-to-end support.
How to Size a Grease Trap: Methods and Formulas
Grease trap sizing in the UAE is based on peak wastewater flow rate and a minimum 30-minute grease retention time. Three calculation approaches are accepted; Dubai Municipality 2021 technical guidelines reference the flow-rate method as primary, while international codes such as the Uniform Plumbing Code (UPC) provide the fixture-unit and seating-capacity alternatives.
1. Flow-Rate Method (Dubai Municipality Primary Method)
Calculate the peak flow rate in litres per second (l/s) from all fixtures discharging grease-bearing wastewater: pot sinks, wok ranges, combi ovens, dishwashers. The minimum trap volume is:
Dubai Municipality requires this calculation to be documented and submitted with drainage plans on the municipality application form.
2. Fixture-Unit Method (UPC / International Codes)
Assign Drainage Fixture Unit (DFU) values to each fixture using UPC Table 702.1, sum the total, then cross-reference UPC Table 1014.3.6 to determine interceptor size. This method is widely used by MEP consultants and is accepted by UAE authorities when accompanied by stamped engineering drawings.
3. Seating-Capacity Formula
For quick estimates during concept design, the seating-capacity approach is useful:
As a broad reference, industry guidance aligned with Dubai Municipality suggests: small cafes and coffee shops — 20 to 50 litres; standard restaurants — 50 to 150 litres; high-volume operations such as hotel kitchens and food courts — 150 litres and above, with industrial installations often exceeding 1,000 litres. Always verify against the flow-rate calculation; these ranges are indicative, not regulatory minimums.
Accurate sizing requires an on-site assessment of your drainage layout, menu type, and peak service covers. Our restaurant kitchen design team prepares full FOG load calculations as part of every kitchen design package.
Above-Ground, In-Ground, and Grease Interceptor: Which Do You Need?
UAE authorities recognise three physical configurations. The correct choice depends on flow rate, available floor space, and the specific municipality approved product list.
Above-Ground (Hydromechanical) Grease Traps — Dubai Municipality Type A
Compact units installed directly beneath or beside a single fixture. Dubai Municipality classifies these as Type A: flow rate 1 to 5 l/s, depth 450 mm, GRP cover (1,070 x 820 x 15 mm), removable perforated PVC bucket with a 5 mm neoprene gasket seal and brass wing-nut fasteners. They suit small cafes, juice bars, and single-sink installations. Because they fill quickly, they require the most frequent maintenance. Dubai Municipality mandates cleaning when the trap reaches 25% full, which in a busy kitchen can mean weekly service. For a full maintenance schedule guide, see our article on grease trap cleaning frequency in the UAE.
Floor-Mounted and Shallow In-Ground Units — Dubai Municipality Type B
Type B units handle 5 to 25 l/s and are suitable for mid-sized restaurants, central kitchens, and bakeries with multiple fixtures. Constructed from AISI 304 stainless steel or HDPE, these units are placed in the kitchen plant room or just outside the back-of-house drain channel. The AG Series stainless steel models commonly used in the UAE range from 53 litres (AG1, 27 l/min) up to 1,134 litres (AG5 industrial, 567 l/min).
In-Ground Gravity Grease Interceptors — Dubai Municipality Types C and D
Required for hotels, malls, food courts, and any operation generating more than 25 l/s of FOG-bearing wastewater. Type C and D units are deep in-ground gravity interceptors in HDPE, fibreglass-reinforced plastic (FRP), or reinforced concrete. They require excavation and provide substantially greater holding capacity between service intervals. In-ground interceptors should be positioned where a vacuum tanker can reach the access lid without moving equipment.
Material Standards
DM-approved materials include AISI 304 stainless steel, UPVC, GRP, HDPE, reinforced concrete, and neoprene gaskets (5 mm minimum). The internationally referenced testing standards are ASME A112.14.3 and PDI G-101 (2017) for hydromechanical units, and EN 1825-1/EN 1825-2 for gravity interceptors. Confirm that any unit you specify appears on the Dubai Municipality approved products register before ordering.
Dubai Municipality Approval Process
Only contractors holding Activity Code 900017 — issued by Dubai Economy and licensed under Dubai Municipality — are authorised to install grease traps in Dubai. Using an unlicensed contractor voids the DM compliance certificate and exposes the operator to direct liability.
The eight-step approval process:
The compliance certificate is required for restaurant licence issuance and renewal and for passing the Dubai Municipality restaurant inspection. Keep all documentation on-site as inspectors may request it at routine visits.
Installation and Placement Rules
Correct placement is as important as correct sizing. A well-sized unit installed too far from the source will trap solidified grease in the connecting pipework before it reaches the interceptor.
For ongoing compliance after installation, our restaurant grease trap cleaning service covers all UAE emirates with DM-certified technicians and digital compliance records.
How Requirements Differ Across Dubai, Abu Dhabi, and Sharjah
The underlying obligation — grease traps mandatory for all commercial kitchens — is consistent across all seven emirates. However, sizing methodology, approval authority, and administrative process vary significantly.
Dubai
The most prescriptive regime. Governed by Dubai Municipality under Local Order No. (8) of 2002 and Administrative Order No. 181 of 2007 (FOG waste). Installation requires an Activity Code 900017 contractor, a DM application with drainage drawings, and a post-installation DM inspection before the compliance certificate is issued. DM maintains an approved product register; only listed models may be installed. FOG waste must be disposed of through DM-approved waste management companies registered on the FoodWatch digital platform.
Abu Dhabi
The sewerage authority is Abu Dhabi Sewerage Services Company (ADSSC). ADSSC technical guidelines specify capacity based on a wastewater throughflow formula with three grease-accumulation categories:
The design basis is double the peak wastewater flow, and the interceptor should maintain a width-to-length ratio of 1:1.8. Food business approvals in Abu Dhabi also involve Abu Dhabi Agriculture and Food Safety Authority (ADAFSA). The ADSSC per-litre-per-second capacity formula is distinct from Dubai retention-time sizing; projects spanning both jurisdictions require separate calculations.
Sharjah
Sharjah Municipality drainage department (Industrial Area 5) issues the grease trap fixing certificate. The unit must be installed as close as possible to the premises outlet and must remain readily accessible. The certification process includes removing overflow, scheduled cleaning and washing of baffles, testing inlet and outlet flow, and inspecting the trap body. Operators must obtain the fixing certificate from Sharjah Municipality before the food establishment licence is confirmed.
Northern Emirates
Ajman, Ras Al Khaimah, Fujairah, and Umm Al Quwain each administer requirements through their own municipality offices. In practice, these authorities broadly follow the Dubai Municipality framework and accept DM-approved product specifications. Confirm requirements with the local municipality during the fit-out permit stage.
FAQ
What size grease trap does a 50-seat restaurant in Dubai need?
There is no single fixed answer because size depends on peak flow rate, not seat count alone. Using the seating-capacity formula as a starting point: estimate peak hourly covers (typically 30 to 40 percent of total seats), multiply by 6 gallons per meal with a dishwasher, apply a 2.5 retention factor, and add a storage factor of 1.0 to 1.5. For a 50-seat restaurant, a capacity in the range of 500 to 900 litres is common, but this must be confirmed by a licensed MEP engineer against your actual drainage fixture loads before the DM application is submitted.
Can I install a grease trap myself in Dubai?
No. Dubai Municipality requires all grease trap installations to be carried out by a contractor holding Activity Code 900017. Using an unlicensed installer means the installation will not pass the DM inspection, no compliance certificate will be issued, and the restaurant cannot obtain or renew its food licence. The contractor must also submit the municipality application, drainage drawings, and flow test results on your behalf.
What is the difference between a grease trap and a grease interceptor under UAE rules?
Both terms describe devices that separate FOG from wastewater before it enters the public sewer. In UAE practice, grease trap refers to smaller above-ground or shallow hydromechanical units (Dubai Municipality Types A and B, handling up to 25 l/s), while grease interceptor refers to large in-ground gravity units (Types C and D) used in hotels, malls, and food courts. The correct category is determined by the peak flow rate calculation.
Do grease trap requirements differ between Dubai and Abu Dhabi?
Yes. Dubai Municipality uses a retention-time-based sizing formula (peak flow rate multiplied by 30-minute retention), while Abu Dhabi ADSSC uses a capacity-per-litre-per-second throughflow formula with three accumulation tiers (100, 200, or 300 litres per l/s). The approval authorities also differ: Dubai requires Activity Code 900017 contractors and a DM post-installation inspection; Abu Dhabi submissions go through ADSSC with ADAFSA involvement for food businesses. Always use emirate-specific calculations as a unit sized to Dubai specifications may be undersized or oversized for an Abu Dhabi site.