| Sources of Water Pollutants | Nature of Water Pollutants |
|---|---|
| Domestic sewage and waste | Organic and inorganic matter, pathogenic microorganisms, nutrients such as nitrogen and phosphorus |
| Industrial effluents | Toxic chemicals, heavy metals, oil and grease, acids and alkalis |
| Agricultural runoff | Pesticides, fertilizers, animal waste, sediments |
| Landfills and garbage dumps | Leachates containing organic and inorganic pollutants |
| Oil spills | Petroleum products, toxic chemicals |
| Atmospheric deposition | Acid rain, toxic chemicals |
