Hazardous waste is specifically defined under RCRA as waste that is listed as hazardous by EPA or exhibits one or more hazardous characteristics including ignitability, corrosivity, reactivity or toxicity. Non-hazardous waste does not meet these criteria but is still subject to state solid waste regulations governing disposal. Proper waste characterization is essential because the cost, liability and regulatory requirements for hazardous waste disposal are significantly greater than for non-hazardous waste.