Contaminants can enter water sources through various pathways:
- Agricultural Runoff: The use of pesticides and fertilizers can lead to nitrate and other harmful chemicals seeping into groundwater. - Industrial Discharges: Factories and industrial plants can release toxic chemicals into nearby water bodies. - Leaching from Landfills: Hazardous waste from landfills can leach into the groundwater, introducing carcinogens. - Natural Sources: Some contaminants, like arsenic, can naturally occur in soil and rock formations and leach into water supplies.