Hazardous waste is waste with properties that make it dangerous or potentially harmful to human health or the environment. Hazardous wastes can be liquids, solids, contained gases, or sludges. They can be the by-products of manufacturing processes or simply discarded commercial products, such as cleaning fluids or pesticides. 

Hazardous waste containers should be kept dry and clear of activities that might knock over the container. Storage areas should be downslope and as distant from drinking water sources as possible to provide reasonable assurance source water will not be contaminated. Separation should be greater if the site has sandy soils or fractured bedrock near the land surface.  Provide pallets to keep large drums or containers off the floor. Use containment for large bulk tanks to contain spills. Conduct loading on impermeable surfaces away from drinking water sources; immediately clean up any spills. Comply with hazardous waste regulations prescribed in the state's Rules and Standards for Hazardous Waste.