Guide
Chemical runoff and grease waste handling — what to ask
A full-system clean produces greasy, chemical-laden wastewater — from the canopy, filter soak tanks, duct rinses, and the rooftop fan. Municipal stormwater / FOG BMP sheets are blunt: wash water is not rainwater. Dumping it to a parking-lot drain, roof drain, gutter, or creek is a common enforcement trigger for both the cleaner and the restaurant that hired them. This page is an operator question list before you sign — not a fee schedule, not a permit form, and not legal advice. Local limits differ; verify with your wastewater utility and AHJ.
Short answer
Ask where every gallon goes: captured and hauled, or discharged only to drains that flow to a working grease interceptor / sanitary sewer with utility approval. Storm drains and roof drains are off-limits. Require SDS for chemicals on site, dry-scrape before wash, spill kit + training language in the contract, and a written disposal method (hauler name or approved on-site path). High-pH caustic rinse water can cross into hazardous-waste handling — get the contractor’s plan in writing before the night of the clean.
Storm drain vs sanitary — the split that matters
| Path | What it is | Hood-clean wash water? |
|---|---|---|
| Storm drain / gutter / street inlet | Rainwater to creek/river — typically untreated | No — municipal BMP sheets treat this as illegal discharge |
| Roof drain | Roof runoff to storm system | No — collect rooftop wash; do not pool or push to the drain |
| Sanitary sewer via grease interceptor | Building drains to treatment plant | Only if utility / permit rules allow and interceptor works |
| Licensed hauler / off-site disposal | Wastewater or filter-bath solution removed from site | Common default when on-site discharge is restricted |
| Parking lot / landscaping | Ground surface → often to storm | No |
Secondary municipal pattern (Streets to Creeks / Santa Rosa–style BMP sheets): never clean hoods or filters outdoors where oil, grease, wash, or rinse water can reach a storm drain. If you see an outdoor drain and are unsure, treat it as storm.
Questions to put in the work order
| Ask | Acceptable direction | Walk-away answer |
|---|---|---|
| Where does wash/rinse water go? | Named capture method + hauler or approved sanitary/interceptor path | “We rinse it outside” / shrugs at roof drains |
| Filter soak / bath solution? | Off-site disposal facility (hazardous or non-hazardous as classified) | Dumped to parking lot or storm inlet |
| Rooftop fan wash? | Contained; no entry to roof drains; containment emptied/documented | Hose toward the curb or scupper |
| Can we see SDS sheets? | SDS for every product brought on site; storage/spill plan | No sheets / “just degreaser” |
| pH / corrosive rinse risk? | Plan for monitoring or haul-away if caustic exceeds local limits | Ignores pH; secondary sheets flag high-pH as hazardous |
| Grease solids scraped first? | Dry wipe/scrape to tallow or solid-waste rules before wash | Everything pressure-washed with no solids capture |
| Spill kit + training? | Contract BMPs, spill response, stormwater awareness | No kit, no training language |
| Proof after the job? | Disposal receipt / manifest or note of approved discharge path | “Trust us” with nothing in the file |
Contract language that helps
- BMPs required; no discharge to storm drains or roof drains
- Named disposal method (hauler or approved interceptor path)
- SDS available on site; spill kit staged
- Dry-scrape / contain solids before wash
- Copy of disposal documentation left with the kitchen file
Operator risks if you skip this
- Stormwater citation shared with the restaurant that hired the crew
- Blocked grease interceptor from unstrained sludge
- Roof grease tracking into storm after the next rain
- No SDS when a spill or injury report is required
- Insurer / landlord asking who allowed outdoor wash-down
Field note — local limits vary
- Some utility BMP sheets list pH windows and temperature caps before sanitary discharge is allowed (examples differ by city — verify yours; do not treat one brochure as national law).
- Secondary Santa Rosa / Streets to Creeks pattern: pH above roughly 12.5 may be managed as hazardous waste — not poured to any drain.
- EPA National Pretreatment Program FOG fact sheets address food-service FOG control at the POTW level — hood wash water still falls under local stormwater and sewer rules.
- Rooftop grease cups / containment (separate guide) reduce fan drip to the roof — they do not authorize dumping wash chemicals into roof drains.
- We do not list municipal fines or fees here — look up your city’s FOG / stormwater page.
Night-of checklist for the manager on duty
- Walk the exterior drains — confirm crew knows which are storm vs sanitary before water starts.
- Stage plastic / absorbents — protect cookline; catch indoor runoff; block paths to doors that lead outside.
- Collect SDS packet — file with the cleaning report for that night.
- Rooftop watch — no hose to scuppers; containment emptied to agreed disposal, not left pooled.
- Interceptor honesty — if they claim discharge to your grease interceptor, confirm it is sized, maintained, and allowed for this waste stream.
- Get the receipt — hauler ticket or written disposal note before the crew leaves.
- Photo the staging — containment mats / totes visible if you need to show the AHJ or landlord later.
Who it’s for / not for
- For: GMs and facilities leads writing RFP language; operators after a stormwater warning; multi-unit teams standardizing vendor rules
- Not for: inventing local fees or permit numbers; grease-trap pumping schedules as a substitute for this topic; bare-metal cleaning quality (use the bare-metal guide); legal or environmental counsel
Sources
- Streets to Creeks — commercial kitchen hood cleaning BMPs (secondary municipal education; storm vs sanitary, rooftop, SDS, contracting)
- City of Santa Rosa — Commercial Kitchen Hood Cleaning PDF (secondary municipal BMP sheet; disposal / pH notes — verify locally)
- WA Stormwater Center — FOG BMPs brochure (secondary; professional cleaner wastewater collection / interceptor conditions)
- EPA — National Pretreatment Program FOG fact sheet (food service) (federal secondary overview of FOG controls; not a hood-clean how-to)
- City of Pleasanton — FOG Program Manual (secondary; hood/filter wash to GCD-connected drains only)
- Clark County Combined Health District — restaurant grease FOG (secondary; wash water / storm sewer cautions)
- FindHoodCleaner — cleaning process notes (secondary; chemical handling / rooftop containment mention during professional cleans)
Next step
Add two lines to your next work order: (1) disposal method named — hauler or approved interceptor path; (2) no discharge to storm or roof drains. Ask for SDS before the crew arrives and keep the disposal receipt with that night’s cleaning report. Confirm rules with your wastewater utility and local stormwater program — this page is pattern guidance, not a permit.