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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