Interest in tap water safety and water filters has increased in the United States as many households consider whether extra treatment is necessary. Public drinking water is regulated under the Safe Drinking Water Act, which allows the Environmental Protection Agency (EPA) to set safety standards for more than ninety contaminants, including chemicals, microbes, and metals. Water utilities treat drinking water with disinfectants such as chlorine before water reaches homes. These treatments reduce harmful bacteria and other pollutants. Most public utilities meet federal standards, so tap water is generally safe in many communities. However, old pipes and building plumbing can affect water quality at the faucet. Annual Consumer Confidence Reports provide information about detected contaminants and safety results. Increased awareness of PFAS chemicals and lead has also raised interest in household water filtration products.

Some households use laboratory testing kits to learn more about water quality. These tests can detect metals, microplastics, and chemical byproducts from water treatment. Test results may help households decide whether a filter is necessary. Basic carbon filters, often used in pitchers or faucet devices, can reduce chlorine and improve taste or odor. More advanced systems, such as reverse osmosis units, can remove additional substances but often require higher costs and installation. Experts say filtration systems should match specific water concerns because different filters target different contaminants. Poor maintenance can reduce filter effectiveness and allow bacteria to grow in old cartridges.