When a manufacturing process waste is considered a hazardous waste because it contains a substance in the 'P' or 'U' lists, the waste must be listed as a 'F' or 'K' waste. According to s. A waste displaying any one of these four characteristics is deemed hazardous. Ignitability relates to the waste's ability to burn or stimulate the burning of something else. Liquid wastes are considered corrosive if they corrode steel by more than one-quarter of an inch per year.
Reactivity relates to the waste's extreme instability and tendency to react violently or explode.
Toxicity relates to the waste's ability to contaminate groundwater. Whenever a non-hazardous solid waste is mixed with one or more listed hazardous wastes, the mixture is considered a hazardous waste. According to s. Wis. Adm. Code , a mixture is not considered hazardous if it consists of wastewater and includes one or more of the following waste streams. Mixing solid waste and hazardous waste may require a hazardous waste treatment license.