Answer:
Around the world the most significant restriction on access to potable water is money. While access to raw water sources, clean or otherwise, is important, the purification process itself is expensive. Once water has been rendered potable, it is important that it be delivered without reintroducing contamination.
China has little environmental restrictions on industries making them extremely profitable at the expense of the environment, that's one of the reasons why China is one of the fastest-growing economies
