The presence of harmful substances in air, water, soil, buildings, or food at levels that can damage health, property, or the environment is known as environmental contamination.

Common examples include lead in drinking water, PFAS in groundwater, mold inside a rental home, pesticide drift onto neighboring land, asbestos in an older building, or chemical vapors released from a factory site. Sometimes the source is obvious, like a spill or leaking storage tank. Other times it builds quietly over years, which is part of what makes these cases so frustrating. Exposure may cause immediate symptoms, or it may be linked later to cancer, breathing problems, neurological harm, skin conditions, or occupational illness.

For an injury claim, the key issues are usually causation, the level and duration of exposure, who controlled the property or substance, and whether the danger should have been discovered sooner. Evidence often comes from testing results, medical records, workplace history, and agency reports. In Michigan, contamination claims may involve the Michigan Department of Environment, Great Lakes, and Energy and the statute of limitations can vary depending on the legal theory, such as negligence, premises liability, or product liability.

Michigan also follows modified comparative fault under MCL 600.2959 and MCL 600.6304: if an injured person is more than 50% at fault, recovery is barred; if 50% or less, damages are reduced by that share of fault.