We rightly expect that no one will endanger our health by his unclean habits. It is also a very serious matter when someone — deliberately or thoughtlessly — pollutes our water supplies.
एक और गंभीर समस्या तब आती है जब कोई जानबूझकर या लापरवाही से हमारे इस्तेमाल करनेवाले पानी को दूषित कर देता है ।