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A grease interceptor or automatic grease removal device shall be required to receive the drainage from fixtures and equipment with grease-laden waste located in commercial food preparation areas, such as in restaurants, hotel kitchens, hospitals, school kitchens, bars, factory cafeterias and clubs. Fixtures and equipment shall include pot sinks, prerinse sinks, soup kettles or similar devices, wok stations, floor drains or sinks into which kettles are drained, automatic hood wash units and dishwashers without prerinse sinks. Grease interceptors and automatic grease removal devices shall receive waste only from fixtures and equipment that allow fats, oils or grease to be discharged. Where lack of space or other constraints prevent the installation or replacement of a grease interceptor, one or more grease interceptors shall be permitted to be installed on or above the floor and upstream of an existing grease interceptor.
The Department of Water Management is authorized to require installation of a grease interceptor or other remedial measures for other types of buildings where either:
1. Wastewater discharged to the public sewer contains fats, oils or greases of animal, vegetable or mineral petroleum origin at a concentration exceeding 15 mg/L.
2. The building sewer has a visually evident accumulation of fat, oil or grease of animal, vegetable or mineral petroleum origin which either alone or in combination with other wastes is reasonably likely to be capable of obstructing the flow or interfering with the operation or performance of any part of the sewer system.
(Amend Coun. J. 11-8-12, p. 38872, § 373; Amend Coun. J. 10-14-21, p. 37722, Art. X, § 3)
Systems that dispense interceptor performance additives to grease interceptors shall not be installed except where such systems dispense microbes for the enhancement of aerobic bioremediation of grease and other organic materials, or for inhibiting growth of pathogenic organisms by anaerobic methods. Such microbial dispensing systems shall be installed only where the grease interceptor manufacturer's instructions allow such systems and the systems conform to ASME A112.14.6. Systems that discharge emulsifiers, chemicals or enzymes to grease interceptors shall be prohibited.
(Amend Coun. J. 7-29-15, p. 3537, § 4; Amend Coun. J. 10-14-21, p. 37722, Art. X, § 3)
Hydromechanical grease interceptors; fats, oils and greases disposal systems and automatic grease removal devices shall be sized in accordance with ASME A112.14.3, ASME A112.14.4, ASME A112.14.6, CSA B481.3 or PDI G101. Hydromechanical grease interceptors; fats, oils and greases disposal systems and automatic grease removal devices shall be installed in accordance with the manufacturer's instructions. Where manufacturer's instructions are not provided, hydromechanical grease interceptors; fats, oils and greases disposal systems and automatic grease removal devices shall be installed in compliance with ASME A112.14.3, ASME A112.14.4, ASME A112.14.6, CSA B481.3 or PDI G101.
(Amend Coun. J. 11-8-12, p. 38872, § 374; Amend Coun. J. 10-14-21, p. 37722, Art. X, § 3)
Grease interceptors shall have the grease retention capacity indicated in Table 18-29-1003.3.5.1 for the flow-through rates indicated.
Total Flow-Through Rating (gpm) | Grease Retention Capacity (pounds) |
Total Flow-Through Rating (gpm) | Grease Retention Capacity (pounds) |
4 | 8 |
6 | 12 |
7 | 14 |
9 | 18 |
10 | 20 |
12 | 24 |
14 | 28 |
15 | 30 |
18 | 36 |
20 | 40 |
25 | 50 |
35 | 70 |
50 | 100 |
75 | 150 |
100 | 200 |
For SI: 1 gpm = 3.785 L/m, 1 pound = 0.454 kg.
a. For total flow-through ratings greater than 100 (gpm), double the flow-through rating to determine the grease retention capacity in pounds.
(Amend Coun. J. 10-14-21, p. 37722, Art. X, § 3)
Grease interceptors shall be equipped with devices to control the rate of water flow so that the water flow does not exceed the rated flow. The flow-control device shall be vented and terminate not less than 6 inches (150 mm) above the flood rim level or installed in accordance with the manufacturer's instructions.
(Amend Coun. J. 10-14-21, p. 37722, Art. X, § 3)
Where automatic grease removal devices are installed, such devices shall be located downstream of each fixture or multiple fixtures in accordance with the manufacturer's instructions. The automatic grease removal device shall be sized to pretreat the measured or calculated flows for all connected fixtures or equipment. Ready access shall be provided for inspection and maintenance.
(Amend Coun. J. 10-14-21, p. 37722, Art. X, § 3)
The required capacity of gravity grease interceptors and gravity grease interceptors with fats, oils and greases disposal systems shall be determined by multiplying the peak drain flow into the interceptor in gallons per minute by a retention time of 30 minutes.
Prefabricated gravity grease interceptors shall be designed and tested in accordance with IAPMO/ANSI Z1001. Manufactured gravity grease interceptors with fats, oils and greases disposal systems shall be designed and tested in accordance with ASME A112.14.6 and IAMPO/ANSI Z1001. Gravity grease interceptors and gravity grease interceptors with fats, oils and greases disposal systems shall be installed in accordance with manufacturer's instructions. Where manufacturer's instructions are not provided, gravity grease interceptors and gravity grease interceptors with fats, oils and greases disposal systems shall be installed in compliance with ASME A112.14.6 and IAMPMO/ANSI Z1001.
(Amend Coun. J. 10-14-21, p. 37722, Art. X, § 3)
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