Grade D — Poor Water Systems
Score range: 35-49/100
Water systems with significant safety issues, multiple violations or enforcement actions.
Grade D Water Systems (6)
Phoenix City Of
Phoenix, Arizona
Glen Burnie-Broadneck
Millersville, Maryland
Chandler City Of
Chandler, Arizona
Des Moines Water Works
Des Moines, Iowa
Topeka, City Of
Topeka, Kansas
Santa Fe Water System (city Of)
Santa Fe, New Mexico
Frequently Asked Questions
A Grade D rating means the water system scored between 35-49 out of 100 on our Water Safety Score. Water systems with significant safety issues, multiple violations or enforcement actions. The score factors in health-based violations (40%), contaminant exceedances (30%), enforcement history (20%), and monitoring compliance (10%).
6 water systems are currently rated Grade D, serving a combined population of 2,695,762 people. 6 of these systems have at least one health-based violation on record.
Use the search tool on our homepage to look up your water system by zip code. Every system in the US is graded A through F based on EPA violation data from the Safe Drinking Water Information System (SDWIS).