Blue Green Algae in the Klamath Basin

On March 13, 2008, EPA has reconsidered its prior approval of the omission of microcystin toxin listings for three Klamath River segments, and on March 13, 2008, determined to add a listing for microcystin toxin for one of these three segments, “Klamath River HU, Middle HA, Oregon to Iron Gate”. California’s 2006 Section 303(d) List already identifies each segment of the Klamath River within California as impaired due to Nutrients, Organic Enrichment/Low Dissolved Oxygen, and Temperature. EPA’s reconsideration of its decisions related to microcystin toxin and the Klamath River, and its determination to add a listing for microcystin toxin for one of the river’s segments, do not affect EPA’s determinations regarding any other portion of California’s Section 303(d) List. Neither EPA’s approval of the State’s listings for the Klamath River listings, nor EPA’s determination to add the listing for microcystin toxin, extends to any water bodies located within Indian country, as defined in 18 U.S.C. 1151.

• EPA’s March 2008 decision document for microcystin toxins in Klamath River - (PDF - 117Kb)