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Water Quality

Description: 

Drinking water systems are measured for:

  1. Levels of contaminants that exceed maximum permissible allowances, also called maximum contaminant levels (MCL)
  2. Techniques applied to treat water to make it safe
  3. How and when systems are monitored and reported in compliance with the law

Data reported here are health based violations, which include both MCL violations, meaning the amount of a contaminant exceeded the safety standard, and treatment violations, meaning that the water was not treated properly.

Residents depend on consistent, safe drinking water to ensure a basic quality of life. When water systems are in violation of standards, or if there are errors in treatment or measurement, human health is put at risk, supplies may be suspended, and people lose confidence in the safety of the water supply.

Data Source: 

U.S. Environmental Protection Agency's Safe Drinking Water Information System (SDWIS), Water systems serving populations of 10,000 or more in Arizona.

Link: http://oaspub.epa.gov/enviro/sdw_form_v2.create_page?state_abbr=AZ
 

Data Quality Comments: 

Disclaimer: EPA is aware of inaccuracies and underreporting of some data in the Safe Drinking Water Information System and is working with the states to improve the quality of the data.

iconWater Systems Total Health-Based Violations in Arizona by County

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Visualization Notes:

Reports supplied by water systems serving 10,000 or more people only.

iconWater Systems Health-Based Violations in Maricopa County by Regions

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Visualization Notes:

Reports supplied by water systems serving 10,000 or more people only.

Data Source

U.S. Environmental Protection Agency's Safe Drinking Water Information System (SDWIS), Water systems serving populations of 10,000 or more in Arizona.

Link: http://oaspub.epa.gov/enviro/sdw_form_v2.create_page?state_abbr=AZ