F037 RCRA waste code Oily sludge from refinery oil-water separators.

Free, no account
Based on 40 CFR 261.31 and EPA hazardous-waste rules
Nothing is stored

F-listed waste
Primary oil, water and solids separator sludge from a refinery

F-list process waste.

Toxic F-listed waste. Sludge from primary physical or chemical oil-water separation at petroleum refineries.

Is F037 hazardous waste?

Yes. F037 is a nonacute F-listed hazardous waste when the named source process and waste stream match. The federal table gives it hazard code T for toxicity.

F037 is listed by source, so how and where the waste arose decides it, not a concentration test alone. A test can add a characteristic code but doesn't remove the listing once its conditions are met. On a required hazardous waste manifest, put F037 in Item 13. Look up the VSQG exemptions and empty-container rules too.

What does F037 cover?

Primary sludge from gravity separation of oil, water and solids in petroleum refinery process wastewater or oily cooling water. It includes sludge from separators, tanks, impoundments, conveyances, sumps and stormwater units that receive dry-weather flow. It excludes the stormwater, segregated cooling-water, aggressive biological treatment and K051 sludges named in the official listing. The 261.4(a)(12)(i) recycling exclusion needs the material to go back into refining with no land placement first and no speculative accumulation. Thermal cracking also needs nonhazardous coke.

Hazard code: T for toxicity
Rule: 40 CFR 261.31

Is primary refinery separator sludge F037 or F038?

Code	When it fits
F037	Primary sludge from gravity separation of oil, water and solids in petroleum-refinery process wastewater or oily cooling water.
F038	Sludge or float from physical or chemical separation of oil, water and solids in petroleum-refinery process wastewater or oily cooling water.

The operation and waste form pick the listing, not the chemical content alone. The rows show nearby listed streams, not every code that could apply. Add any characteristic or other listing that also fits, since one waste can carry more than 1 federal code.

When does a recycling residual become F037?

A residual from processing or recycling refinery material that 261.4(a)(12)(i) excludes becomes F037 once it is disposed of or meant for disposal, if the original material would have met a Subpart D listing.

Which codes sit beside F037?

Code	What it is
F025	Filters, drying agents and light residues from chlorinated hydrocarbons
F026	Waste from equipment formerly used with alkaline chlorobenzenes
F027	Unused chlorophenol formulations
F028	Residue from heat-treating soil contaminated with listed dioxin waste
F032	Waste from wood preserving with chlorophenol products
F034	Waste from wood preserving with creosote
F035	Waste from wood preserving with arsenic or chromium
F039	Leachate from more than one restricted listed hazardous waste