Why monitor water quality?

Why monitor water quality?Monitoring provides the objective evidence necessary to make sound decisions on managing water quality today and in the future.
Water-quality monitoring is used to alert us to current, ongoing, and emerging problems; to determine compliance with drinking water standards, and to protect other beneficial uses of water.
Assessments based on monitoring data help lawmakers and water managers measure effectiveness of water policies, determine if water quality is getting better or worse, and formulate new policies to better protect human health and the environment.