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china access to clean water, clean water and sanitation in china, clean water and sanitation problems in china, does beijing have access to clean water, access to clean water by country, china water and wastewater, water protection in china, access to clean water worldwide, world access to clean water, water security in china, water use in china, water safety in china, access to clean water in developing countries, water treatment in china, drinking water in china, water availability in china, water management policies in china, chinese government water policy, tap water in china, drinking tap water in china