Industrial Pretreatment Program

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The Industrial Pretreatment Program

The Industrial Pretreatment Program, also called IPP, is a program to reduce the volume of pollutants discharged into the sewer system that have the potential to cause harm to the collection system, the treatment plant, or the facilitys employees. The program is designed to eliminate any discharges that cannot be treated by the water pollution control facility and therefore have the potential to cause harm to Narragansett Bay.

The IPP program issues Wastewater Discharge Permits to businesses who discharge large volumes of wastewater or who discharge any substance other than domestic sewerage. Businesses in Newport and Middletown discharge to the Newport Water Pollution Control Facility and are therefore, subject to the conditions of the Newport Sewer Use Ordinance.

All businesses must meet the local discharge limits. Click on the link to view the daily maximum limits. Dilution is not allowed as means of meeting the discharge limits.

Businesses that are typically regulated by the IPP include restaurants, cafeterias, supermarkets, vehicle and boat maintenance facilities, dry cleaners, laundries, medical facilities, laboratories, medical centers, photo developers and food and beverage production operations.

All eating establishments are required to install automatic grease recovery devices (GRDs) and to have a current Grease and Solids Interceptor Permit. GRDs prevent sewer blockages caused by grease by removing fats and grease from the wastewater before it is discharged.

Commercial kitchens, including those in restaurants, cafeterias and supermarkets must discharge their three-bay sinks, pre-rinse stations and pot sinks through an electrical/mechanical grease recovery device. In-ground interceptors are allowed. Passive grease traps are not allowed. Click on the link below to view the Standards for Grease Removal Systems document.

The IPP must approve the specifications for all GRDs and in-ground interceptors and plans for their installation before the equipment is installed. Click on the link below for the Grease and Solids Interceptor Permit Checklist.

For a Grease and Solids Interceptor Application please contact the IPP at (401) 845-2000. The Plumbing and Drainage Institutes web-site, shows some examples of GRDs that have been allowed by the IPP program.

Rendering services are required for the proper disposal of grease extracted by the GRDs. Restaurant owners must maintain a Grease Trap Cleaning Log and must show this log to an IPP inspector upon request. Click on the link below for a copy of the Grease Trap Cleaning Log.

Businesses subject to the conditions of the IPP, other than eating establishments, must complete an Industrial Waste Questionnaire as part of their application for a Wastewater Discharge Permit. Please contact the IPP at 845-2000 for a copy of the questionnaire.

In many instances businesses are required to submit the results of periodic self-monitoring testing and to install pretreatment equipment as a condition of their Wastewater Discharge Permit. All businesses regulated by the IPP are subject to inspections.

The Industrial Pretreatment Program is administered by the City of Newport as a regulatory requirement of the Environmental Protection Agency and the Rhode Island Department of Environmental Management.

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