Riverside restaurants warned on costly sewer backups tied to used cooking oil

Riverside food businesses are being urged to tighten grease handling after improper disposal of used cooking oil and FOG can trigger blockages, sewer overflows, emergency repairs and business interruptions. The warning comes as the city maintains more than 800 miles of sewer lines and requires restaurants to manage grease through approved devices and collection practices.

Why it matters: - Improper grease disposal can turn routine kitchen waste into costly sewer backups for Riverside restaurants. - Blockages can lead to emergency plumbing, cleanup bills, property damage, lost operating time and sanitation problems. - Grease-related overflows also add maintenance pressure to Riverside’s public sewer system.

What happened: - Riverside restaurants generate used cooking oil every day from frying and other kitchen work. - Oil and grease poured into sinks, floor drains or other plumbing can move into wastewater lines and cause blockages. - Riverside Grease Company said it has seen grease buildup develop into recurring drain backups, sewer blockages and overflowing grease traps.

The details: - Grease can cool in drainage lines, stick to pipe walls and trap food particles and other debris. - As buildup grows, drains may slow, standing water may appear and wastewater can back up into the restaurant. - The City of Riverside maintains more than 800 miles of sewer lines, 16,000 manholes and 19 pump stations. - The city relies on inspection, cleaning, hydro-jetting and repairs to keep wastewater moving. - When grease-related blockages occur, the city may need additional crews, equipment and emergency work to clear affected lines. - Riverside requires restaurants to manage fats, oils and grease and to maintain required grease recovery devices. - Businesses that fail to comply can face inspections, corrective measures and enforcement under local rules. - Restaurants may also be responsible for cleanup and related response costs after overflows. - Experts recommend regular cleaning and inspection of grease traps and interceptors based on kitchen volume and equipment. - Larger interceptors should be fully pumped, with both compartments emptied instead of pushing waste back into the system. - Chemical additives meant to break down grease can move fats and oils farther into downstream sewer lines. - Used fryer oil and cooking grease should be stored separately from wastewater in dedicated, covered, leak-proof containers for scheduled collection by an authorized hauler. - Outdoor oil containers and grease bins should stay covered, secure and away from storm drains. - Spills should be cleaned up promptly. - Restaurant employees should be trained on FOG handling, spill response, container use and keeping oil and grease out of sinks and floor drains.

Between the lines: - The problem usually builds gradually, which means a sewer backup can start as a small drainage issue before becoming an emergency. - Recurring backups suggest the underlying issue may be continued grease entering the system, not just a one-time plumbing failure. - Consistent grease management can reduce disruption for restaurants and reduce strain on the wastewater network.

What's next: - Restaurants in Riverside are being pushed to keep used cooking oil out of wastewater and maintain grease control equipment more consistently. - Regular pumping, collection and staff training are the main steps highlighted to prevent repeat backups and overflows. - Businesses that do not adjust practices may continue to face repair costs, lost service time and regulatory consequences.

The bottom line: - In Riverside, improper used cooking oil disposal is not just a kitchen problem; it is a recurring operational and infrastructure risk.