A Grade F rating means the water system scored between 0-34 out of 100 on our Water Safety Score. Water systems with serious safety failures, numerous violations and contaminant exceedances. The score factors in health-based violations (40%), contaminant exceedances (30%), enforcement history (20%), and monitoring compliance (10%).

25 water systems are currently rated Grade F, serving a combined population of 8,775,089 people. 25 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).

Grade F — Failing Water Systems

Grade F Water Systems (25)

City of Baltimore

Columbus Public Water System

Atlanta

Aqua Pa Main System

Salt Lake City Water System

New Orleans Carrollton Water Works

Columbia City of (sc4010001)

Newark Water Department

Mobile, Bd. Of W&amp;s Comm. Of the City Of

Fort Wayne - 3 Rivers Filtration Plant

Gilbert, Town Of

Liberty Utilities New York - Lynbrook

Kalamazoo

Shreveport Water System

City of Jackson

Springfield Water and Sewer Commission

Tuscaloosa Water &amp; Sewer

Bjw&amp;sa (0720003)

Clermont Public Water System

Lowell Regional Water Utility

Las Cruces Municipal Water System

Sioux City Water Supply

Roswell Municipal Water System

Papillion, City Of

Kearney, City Of

Frequently Asked Questions

Mobile, Bd. Of W&s Comm. Of the City Of

Tuscaloosa Water & Sewer

Bjw&sa (0720003)