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At EWG, our team of scientists, engineers, policy experts, lawyers and computer programmers pores over government data, legal documents, scientific studies and our own laboratory tests to expose threats to your health and the environment, and to find solutions. Our research brings to light unsettling facts that you have a right to know.

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Pouring It On: Table 1


2.1 million people drank water from systems that violated federal nitrate standards at least once since 1985

State Number of Systems
in Violation
Population Affected
Ohio 36 413,441
Arizona 42 400,765
California 112 380,670
Illinois 156 274,332
Pennsylvania 456 154,877
Kansas 103 86,130
Washington 39 67,325
Oklahoma 132 66,938
Iowa 137 52,970
Nebraska 116 44,513
Texas 60 41,685
Colorado 22 39,707
Connecticut 8 21,142
Delaware 85 19,142
Michigan 74 18,435
Maryland 59 15,983
New Jersey 59 10,511
New York 16 10,323
Wisconsin 63 6,015
Florida 36 4,964
Minnesota 44 4,440
Indiana 35 3,798
Kentucky 5 3,428
North Carolina 19 2,720
South Dakota 13 2,619
West Virginia 6 2,303
New Mexico 12 1,938
Virginia 10 1,889
Oregon 8 1,820
Vermont 2 1,680
Idaho 4 1,530
Rhode Island 8 1,240
Montana 8 963
Alaska 7 850
Missouri 4 634
South Carolina 10 395
Maine 5 365
Georgia 1 200
North Dakota 3 155
Massachusetts 1 25
Total 2,016 2,162,860