Yellow grease is the industry term for used cooking oil that has been collected from commercial fryers and rendered into a recyclable form. It typically has a free fatty acid content below 15 percent and a low moisture level, making it suitable as feedstock for biodiesel and renewable diesel production. Brown grease, by contrast, comes from grease trap interceptors and contains significantly higher levels of water, food solids, and contaminants that make it more difficult and expensive to process. Trap grease requires specialized handling and often goes to different processing facilities. The distinction matters because yellow grease commands a higher recycling value and follows a different regulatory pathway under California law. Our collection service handles yellow grease from fryers and cooking operations, if you also need grease trap cleaning, we offer that as a separate service with its own equipment and scheduling.

Our theft prevention approach uses multiple physical barriers rather than relying on a single lock. Each container is built with reinforced steel walls, a tamper-evident locking lid that shows visible evidence of forced entry attempts, and internal anti-siphon baffles that prevent thieves from inserting a pump hose through the fill port. For high-risk locations, we add hardened steel mounting brackets that bolt the container to a concrete pad, making it impossible to steal the entire unit. The fill port accepts oil from your kitchen staff using a standard pour spout but is designed so that a pump hose cannot achieve suction through the opening. The California Department of Food and Agriculture maintains an Inedible Kitchen Grease registry at apps1.cdfa.ca.gov/IKG/ where you can verify that your hauler is properly licensed, an important step in confirming that the people collecting your grease are legitimate operators, not theft rings posing as haulers.

California Code of Regulations Title 3 Section 1180.24 requires a written manifest for every yellow grease pickup that includes the date and time of collection, the name and license number of the transporter, the vehicle identification number, the volume of grease collected, the origin address, and the destination rendering facility. Both the generator (your restaurant or facility) and the transporter must retain copies of each manifest. CDFA inspectors can request these records during routine audits or complaint investigations, and failure to produce them can result in fines and compliance orders. Our system generates these manifests digitally and automatically, ensuring every required field is populated correctly. You can access, filter, and download your complete manifest history from your online dashboard at any time, and we retain all records for seven years, well beyond the minimum retention period.

The California Department of Food and Agriculture maintains a public registry of licensed Inedible Kitchen Grease transporters at apps1.cdfa.ca.gov/IKG/. You can search this database by company name, license number, or county to verify that any hauler collecting your yellow grease holds a current, valid license. An unlicensed hauler collecting your grease puts your operation at risk, if the grease is stolen, improperly disposed of, or enters an unregulated processing stream, you could face regulatory questions about your waste management practices. The CDFA Rendering FAQ at cdfa.ca.gov/ahfss/MPES/Rendering/RenderingFAQ.html provides additional guidance on generator responsibilities and what to look for when evaluating a hauler. Every driver on our routes carries a current CDFA transporter license, and you can verify our company license directly through the CDFA registry at any time.

After collection, your yellow grease is transported directly to a licensed rendering facility where it undergoes quality testing for free fatty acid content, moisture level, and contaminant presence. The rendering facility processes the grease by heating it to remove water, filtering out food solids and impurities, and producing a clean feedstock that meets specifications for renewable fuel production. This feedstock enters EPA-approved pathways under the Renewable Fuel Standard, where it is converted into biodiesel, renewable diesel, or sustainable aviation fuel. The entire process is documented and auditable. The EPA maintains a list of approved fuel pathways at epa.gov/renewable-fuel-standard/approved-pathways-renewable-fuel that details the specific conversion processes and environmental standards that each feedstock must meet. Your yellow grease, when properly collected and recycled, directly offsets petroleum-based fuel consumption and reduces net carbon emissions.

Pickup frequency depends on your daily oil consumption, fryer count, and container size. A restaurant running four to six fryers that changes oil every three to five days typically fills a 150-gallon container in one to two weeks and does well with weekly pickup. Operations running eight or more fryers, or those doing continuous frying like chicken restaurants and fish fry operations, may fill a 250-gallon container in under a week and need twice-weekly service. Industrial food processors with continuous fryer lines often require daily collection using tanker trucks. During your initial assessment, we calculate your estimated weekly yellow grease output based on fryer count, oil change frequency, and production schedule, then recommend a container size and pickup cadence that prevents overflow. If your volume changes seasonally, many operations see spikes during summer catering season and holiday periods, we adjust your schedule proactively rather than waiting for you to call about an overflowing container.