What’s in Your City Drinking Water? Best and Worst Drinking Water

National Tap Water Quality Database includes water quality tests conducted by 47,667 utilities nationwide from 2004 to 2009. The Environmental Working Group (EWG) obtained the water quality testing data from state health and environmental departments that compile the records from drinking water utilities or associated laboratories. Most state water offices maintain a current record of water utility test data to fulfill their role as primary enforcement agents.

They rated big city (population over 250,000) water utilities based on three factors: the total number of chemicals detected since 2004; the percentage of chemicals found of those tested; and the highest average level for an individual pollutant, relative to legal limits or national average amounts, including for the most common pollutants (disinfection byproducts, nitrate and arsenic).

Top-Rated and Lowest-Rated Water Utilities

TOP RATED WATER UTILITIES LOWEST RATED WATER UTILITIES
1
Arlington, TXArlington Water Utilities
100
Pensacola, FLEmerald Coast Water Utility
2
Providence, RIProvidence Water
99
Riverside, CA
City of Riverside Public Utilities
3
Fort Worth, TX
Fort Worth Water Department
98
Las Vegas, NVLas Vegas Valley Water District
4
Charleston, SCCharleston Water System
97
Riverside County, CAEastern Municipal Water District
5
Boston, MA
Massachusetts Water Resources Authority
96
Reno, NVTruckee Meadows Water Authority
6
Honolulu, HIBoard of Water Supply

(Honolulu/Windward/Pearl Harbor)

95
Houston, TXCity of Houston Public Works
7
Austin, TX
Austin Water Utility
94
Omaha, NE
Metropolitan Utilities District
8
Fairfax County, VAFairfax Water
93
North Las Vegas, NV
City of North Las Vegas Utilities Department
9
St. Louis, MO
City of St. Louis Water Division
92
San Diego, CA
San Diego Water Department
10
Minneapolis, MN
City of Minneapolis Water Department
91
Jacksonville, FL
JEA


See Clean Water Report Card
| Download this Table [PDF]

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