Water pollution is the contamination of water bodies, usually as a result of human activities, that has a negative impact on their uses. Water bodies include lakes, rivers, oceans, aquifers, reservoirs and groundwater. Water pollution results when contaminants mix with these water bodies. Contaminants can come from one of four main sources: sewage discharges, industrial activities, agricultural activities, and urban runoff including stormwater. Water pollution is either surface water pollution or groundwater pollution. This form of pollution can lead to many problems, such as the degradation of aquatic ecosystems or spreading water-borne diseases when people use polluted water for drinking or irrigation. Another problem is that water pollution reduces the ecosystem services that the water resource would otherwise provide.

જળ પ્રદૂષણ એટલે માનવની પ્રવૃત્તિઓના કારણે જયારે સરોવર, નદીઓ, મહાસાગર અને ભૂગર્ભજળ જેવાં જળસ્ત્રોતો દૂષિત થાય છે, અને તેથી આ જળાશયોમાંની વનસ્પતિઓ અને સજીવોને નુકસાન થાય છે અથવા તો નુકસાન થવાની સંભાવનાઓ સર્જાય છે તે સ્થિતિ.