Identify Waste by Sampling and Laboratory Analysis
Laboratory testing is sometimes required when knowledge and research about the waste and its component chemicals does not allow the waste to be fully designated.
Either the generator or a testing service can take the waste samples. If environmental clean-up is needed, the testing service should be independent from the remediation company that does the clean-up. Samples sent to a laboratory are excluded from manifesting and reporting requirements.
The Dangerous Waste regulations regulate the test methods used for waste designation, but they do not give rules for sampling methodology—other than the requirement to take a representative sample for each waste to be tested.
The methods and equipment used for obtaining representative samples of a waste will vary with the type and form of the waste. Samples taken by the methods listed in the regulations are considered presentative samples of the waste.
Find a Testing Laboratory
Ecology’s Hazardous Waste and Toxics Reduction Program (HWTR) does not certify or give accreditation to laboratories that perform dangerous waste designation analysis.
Dangerous Waste Test Methods
The Toxicity Characteristic Leaching Procedure Test (TCLP) is used for testing toxicity characteristic wastes. This test measures how likely it is that toxic chemicals will leach out of a waste in acidic landfill conditions. If the waste exceeds threshold TCLP levels for characteristic chemicals, the waste is a dangerous waste.
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