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The Hidden Cost of "We'll Classify That Waste Stream Later"

3 days ago
4 min read

By: Gav Orman, PE, Director of Compliance Technologies


Every facility has one. A drum of spent filter media in the back corner, a new wastewater sludge from a process change, a pallet of expired product that nobody wants to deal with. Someone on the team says, "We'll classify that waste stream later," and everyone gets back to the work in front of them.


In our earlier post on the hidden cost of tribal knowledge, we looked at what happens when critical compliance information lives in one person's head. Waste determinations are one of the clearest examples of that risk. The decision gets made informally, the reasoning never gets written down, and "later" turns into an inspection finding. Let's look at what the regulation requires, where facilities fall behind, and what that delay actually costs.


What RCRA actually requires

Under 40 CFR 262.11, anyone who generates a solid waste must determine whether it is a hazardous waste. That determination has to be made at the point of waste generation, before any dilution, mixing, or other alteration of the waste [1]. The regulation lays out the steps: check whether the waste is excluded under 40 CFR 261.4, check whether it is a listed hazardous waste, and determine whether it exhibits a hazardous characteristic, using either knowledge of the waste or testing [1].


The determination isn't a one-time event. The rule also requires a new determination any time the waste "has, or may have, changed its properties" during its management [1]. Small and large quantity generators must keep records supporting their determinations, including test results and the process knowledge they relied on, for at least three years from the date the waste was last sent for treatment, storage, or disposal [1].


In other words, "later" isn't an option the regulation provides. The clock starts when the waste is generated.


Where facilities fall behind

State regulators see the same gaps again and again. Michigan's Department of Environment, Great Lakes, and Energy (EGLE) lists failing to identify all hazardous waste as a common generator violation, and calls out wastes that are commonly overlooked, including blind sumps, partially empty aerosol cans, expired products, maintenance and construction wastes, lamps, batteries, rags, sorbents, spent paint filters, spent activated carbon, and sandblasting residue [2]. EGLE also lists failing to document waste evaluations and keep records for three years, and failing to recharacterize when processes or materials change [2].


During my work at the Arizona Department of Environmental Quality, the same issue arose. Failure to make an adequate waste determination is always on the top 10 list of RCRA violations for facilities in Arizona. 


Notice a pattern? Most of those overlooked streams aren't the facility's main process waste. They are the occasional, low-volume streams that nobody owns, which is exactly where "we'll get to it later" tends to happen.


What "later" costs

The most direct cost is enforcement. In November 2025, EPA announced a $306,436 penalty against a coatings facility in Commerce, California. Among the violations, EPA found the facility failed to properly identify hazardous waste generated on site, including waste containing xylene, toluene, and butanol, and failed to determine whether its waste required treatment before land disposal [3]. Those findings sat alongside violations for tank air emission standards, secondary containment, and daily inspections [3]. One missed determination rarely stays one violation.

The indirect costs are harder to see, but they add up:


  1. Everything downstream depends on the determination. Container labeling, accumulation time limits, manifests, land disposal restriction paperwork, and biennial reporting all start from knowing what the waste is. An unclassified stream leaves a gap in every one of them.

  2. Mixing makes the problem worse. Because the determination must be made before any mixing or alteration [1], an unclassified stream that gets combined with other waste can turn a simple question into a much harder one.

  3. The knowledge walks out the door. If the person who "knew" what was in that drum leaves, the facility is left paying for analytical testing to answer a question that process knowledge could have answered for free.

  4. Stale determinations look like no determinations. A characterization done five years ago for a process that has since changed doesn't meet the re-determination requirement [1][2].


Getting ahead of it

The fix isn't complicated, but it does require a system. Inventory every waste stream at the facility, including the occasional and maintenance streams on EGLE's list. Link each one to a documented determination that records the basis (knowledge or testing), the date, and who made it. Set a trigger to revisit the determination when a raw material, supplier, or process changes. And keep the records where the next person can find them, not in a desk drawer or one employee's inbox.


How Toolkit Can Help

We're building a Waste Tool designed around exactly this problem, and it's coming soon. The goal is to let facilities build or upload waste determinations and link them to specific waste streams, then carry that information through accumulation tracking, satellite and central accumulation areas, manifests with a connection to e-Manifest, and biennial reporting. If waste determinations are a pain point for your team, we'd like to hear from you. Reach out to the Toolkit team to join the early access list for the Waste Tool. In the meantime, our Consulting team can help you review your waste streams and get your determinations documented today!


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