Benzene is a toxic chemical found in petroleum products. It enters water from industrial spills and leaking storage tanks. Benzene exposure increases the risk of leukemia.

Benzene, a clear liquid with a sweet odor, is widely used in manufacturing plastics, resins, and synthetic fibers. It can infiltrate water sources through industrial discharges, underground storage tank leaks, and atmospheric deposition. Benzene levels in water are typically measured using gas chromatography. Historically, it was a common gasoline additive until its carcinogenic properties were recognized. Long-term exposure can cause blood disorders and increase the risk of various cancers, particularly those affecting blood-forming organs.