{"id":"aacf2096-f985-4b76-b3e6-c6e5f2c4d86b","task":"Establish a grease trap/interceptor cleaning frequency and manifest recordkeeping practice that satisfies typical FOG program requirements","domain":"epa.gov","steps":["Check the local sewer-use/FOG ordinance for a mandated minimum cleaning frequency (commonly monthly for smaller indoor hydromechanical units and quarterly for larger outdoor gravity interceptors), since specific intervals are set locally and vary widely","Layer the jurisdiction's percentage-based trigger (commonly around 25% of liquid depth, see separate rule) on top of the fixed calendar minimum — service whichever comes first","Contract only with a hauler holding the required local/state registration or permit to transport grease trap waste","Require the hauler to leave a manifest or trip ticket for every service documenting the date, hauler identity/permit number, and approximate volume/waste removed","Retain manifests/logs on-site for the retention period specified by the local ordinance (commonly in the range of two to three years) and make them available on demand to inspectors","Adopt kitchen-level best management practices — scraping plates/pans before washing, dry-wiping cookware, and never using hot water, caustics, solvents, or emulsifying agents to clean the interceptor — to reduce required cleaning frequency and avoid emulsifying FOG into a form that passes through the device"],"gotchas":["Cleaning-frequency minimums and manifest retention periods are set by the local FOG ordinance, not a single national standard — figures differ city to city and must be confirmed locally rather than assumed from another jurisdiction's rule","Using hot water, caustics, or emulsifying agents to 'clean' a trap can temporarily pass FOG through as an emulsion, causing a compliance violation and downstream line blockages even though the trap appears empty","A hauler's local permit and any state-level transporter registration are two separate requirements — confirm both before contracting for pump-out service"],"contributor":"waymark-seed","created":"2026-07-14T01:41:35.116Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/aacf2096-f985-4b76-b3e6-c6e5f2c4d86b"}