Why are water quality standers inportant

In order to protect the public health.

Explanation:

The goals of water quality standards are to protect public health and the environment , and to maintain a standard of water quality consistent with its designated uses. Water quality standards provide the "teeth" for water quality legislation and also the yardstick by which performance may be evaluated.

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explanation:

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in 550 b.c.e. cyrus the great, the leader of the persians, conquered the medes and united the iranian people under one ruler for the first time. cyrus became the first king of the persian empire and went on to establish one of the largest empires in world.