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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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Dishonorable Discharge: The 50 Most Polluted Rivers in the Country


RankRiver/WaterbodyStates with toxic discharges contributing to water pollutionTotal pounds of
direct toxic
discharges to water
(1990-1994)
1Mississippi RiverTN, AR, LA, MO, IL, MN, WI, IA, KY, MS 702,496,748
2Pacific OceanOR, HI, CA 35,195,908
3Ohio RiverIL, IN, OH, KY, WV, PA 22,072,491
4Tennessee RiverKY, TN, AL 22,031,743
5Houston Ship ChannelTX 18,235,338
6Ward CoveAK 14,261,169
7Savannah RiverGA, SC 13,968,965
8Delaware RiverDE, PA, NJ 13,329,248
9Thames RiverCT 13,312,639
10Grays HarborWA 10,840,795
11Rock RiverIL, WI 8,165,469
12Straits Of Juan De FucaWA 7,899,229
13Amelia RiverFL 7,461,070
14Gravelly RunVA 6,330,209
15Calcasieu RiverLA 5,427,508
16Ouachita RiverAR, LA 4,925,933
17Mobile RiverAL 4,572,055
18Columbia RiverWA, OR 4,368,387
19Holston RiverTN 4,098,240
20Genesee RiverNY 3,672,733
21Kansas RiverKS 3,420,965
22Martins CreekMS 3,339,065
23Indiana Harbor Ship CanalIN 2,578,038
24Brazos RiverTX 2,442,430
25Cuyahoga RiverOH 2,427,663
26Patapsco RiverMD 2,329,123
27Kanawha RiverWV 2,320,910
28Susquehanna RiverPA, NY 2,144,339
29Quinnipiac RiverCT 2,105,384
30Fenholloway RiverFL 1,896,369
31Cedar RiverIA 1,881,803
32Everett HarborWA 1,749,650
33Hudson RiverNJ, NY 1,729,084
34Missouri RiverNE, KS, MO, ND, IA 1,727,759
35Neches RiverTX 1,645,307
36Alabama RiverAL 1,613,809
37Escambia BayFL 1,568,522
38Wisconsin RiverWI 1,553,152
39Wabash RiverIL, IN, OH 1,532,308
40Blackwater RiverVA 1,488,346
41Detroit RiverMI 1,449,750
42Little Attapulgus CreekGA 1,431,183
43Androscoggin RiverME, NH 1,388,133
44Escatawpa RiverMS 1,358,148
45Pigeon RiverNC 1,325,423
46Cook InletAK 1,322,140
47Cape Fear RiverNC 1,319,953
48Des Moines RiverIA 1,270,304
49Tombigbee RiverMS, AL 1,210,471
50Willamette RiverOR 1,202,737
Source: Environmental Working Group. Compiled from U.S. Environmental Protection Agency, Toxics Release Inventory 1990-1994.