| The Ohio River's pollution is still at a level that threatens aquatic life, with fish containing so much poison that they are generally considered inedible.
It has been such a long-standing problem, most citizens are not aroused about the issue.
Faced with a lawsuit over mercury releases, the PPG Natrium plant along the Ohio, says it has been working on cutting emissions.
The West Virginia Rivers Coalition and the Washington, D.C.-based group Oceana, have filed an intent to bring suit against the company.
PPG spokesman Jeremy Neuhart says the company has substantially reduced mercury emissions from its New Martinsville plant, which opened in 1943.
The two environmental groups say the PPG plant continues to exceed the legal limits governing mercury releases into the Ohio River.
| 
