Jump to main content.

Monitoring, Assessment and TMDLs

Monitoring, Assessment and Total Maximum Daily Loads (TMDLs) Quick Finder
National Links

You will need Adobe Reader to view some of the files on this page. See EPA's PDF page to learn more about PDF, and for a link to the free Adobe Reader.

On this page:

Impaired and Threatened Waters (Section 303(d)) Lists

The 2002 and 2004 Section 303(d) lists are available via each state's website. EPA has approved 2006 303(d) lists for American Samoa and Guam. California recently submitted their 2004-2006 list to EPA Region 9. Other States and Territories are currently developing the 2006 303(d) lists and have yet to submit for approval.

No lists were required in 2000, pursuant to modification to federal regulations governing listing decisions (63 FR No. 63, p17, 166, March 31, 2000).

Arizona's 2004 Section 303(d) List

On Nov.16, 2004, EPA partially approved and partially disapproved Arizona's 303(d) listing submission. EPA proposed additional waters and pollutants to be included on Arizona's final 303(d) list. On March 17, 2005, EPA issued final decision regarding partial approval and partial disapproval of Arizona's 303(d) list. The letter and response to comments summary are provided below.

Questions concerning Arizona's list should be directed to:
Chris Varga (varga.chris@azdeq.gov)
ADEQ
(602) 771-4665

California's 2004-2006 Section 303(d) List

On May 29, 2008, EPA revised its previous decision to add microcystin toxins as an additional cause of impairment to one Klamath River segment (Middle Hydrologic Area: Oregon to Iron Gate) previously listed by California in its 2006 Clean Water Act Section 303(d) List.  EPA solicited public comment on its action, and has now completed its review of the comments received.  Based on comments from the North Coast Regional Board, EPA agreed to revise the description of the segment which EPA is listing as impaired due to “microcystin toxins.”  EPA identified this impaired portion as “the reach of the Klamath River including the Copco and Iron Gate Reservoirs.”  Accordingly, this segment does not include Klamath River upstream of Copco I Reservoir to Oregon. 

On March 13, 2008, EPA reconsidered its prior approval of the omission of microcystin toxins listings for three Klamath River segments, and 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 toxins and the Klamath River, and its determination to add a listing for microcystin toxins 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 toxins, extends to any water bodies located within Indian country, as defined in 18 U.S.C. 1151.

On Nov. 30, 2006, EPA partially approved California's 2004-2006 303(d) list submission. In summary, this action approved the State's list of impaired waters. On March 8, 2007, EPA partially disapproved California's 2004-2006 303(d) List; that is, we disapproved the State's omission of impaired waters that met federal listing regulations or guidance. EPA identified 36 additional waters bodies and associated pollutants for 34 waters to be added to the State's 303(d) list. EPA provided public notice and the opportunity for public comment on our proposed additions which ended April 16, 2007.

On June 28, 2007, EPA issued its final decision regarding the waters we added to the State’s List. See final transmittal letter with enclosures and responsiveness summary below.

EPA Contact

Peter Kozelka (kozelka.peter@epa.gov)
U.S. Environmental Protection Agency
Mail code: WTR-2
75 Hawthorne St.
San Francisco, CA 94105
(415) 972-3448

Questions concerning State's 303(d) list  Exiting EPA (disclaimer) should be directed to:
California Contact
Skakoora Azimi-Gaylon (sagaylon@waterboards.ca.gov)
(916) 341-5508

 

Top of page

Hawaii's 2004 Section 303(d) List

EPA approved Hawaii's Section 303(d) list on July 2, 2004. The approved list is available from the State of Hawaii's Department of Health, Environmental Planning Office. Exiting EPA (disclaimer)

Questions concerning Hawaii's list should be directed to:
Kelvin Sunada (kelvin.sunada@doh.hawaii.gov)
Hawaii Department of Health
(808) 586-4337

Nevada's 2004 Section 303(d) List

Nevada is currently developing the 2004 Section 303(d) list. The most up-to-date information regarding the State's 303(d) list, including the 2002 list, can be found at the State's website. Exiting EPA (disclaimer)

Questions concerning Nevada's list should be directed to:
Sam Stegman (sstegma@ndep.nv.us)
Nevada Division of Environmental Protection
(775) 687-9451

 

Top of page

Pacific Islands' 2004 Section 303(d) Lists

American Samoa

For the final EPA-approved American Samoa list Section 303(d) on September 2, 2004, contact:
Carl Goldstein (goldstein.carl@epa.gov)
U.S. EPA Region 9
(415) 972-3767

Commonwealth of Northern Mariana Islands

EPA approved Commonwealth of Northern Mariana Islands' Section 303(d) list on July 29, 2004. The approved list is available from the Commonwealth's website as part of the 305(b) Report. Exiting EPA (disclaimer)

For the final Section 303(d) list for CNMI, contact:
Mike Lee (lee.michael@epa.gov)
U.S. EPA Region 9
(415) 972-3769.

Guam

EPA approved Guam's Section 303(d) list Exiting EPA (disclaimer) on July 29, 2004. The approved list is available from Guam's Environmental Protection Agency website. Exiting EPA (disclaimer)

For the draft 2004 Section 303(d) list for Guam, contact:
Michael Wolfram (wolfram.michael@epa.gov)
U.S. EPA Region 9
(415) 972-3027

Tribes

For information concerning listing and TMDL activities for tribal lands, please contact:

Peter Kozelka (kozelka.peter@epa.gov)
U.S. EPA region 9
(415) 972-3448

or

Wendell Smith (smith.wendell@epa.gov)
U.S. EPA Region 9
(415) 972-3421

Top of page

Region 9 Topics and Programs | A-Z Index

Local Navigation

Jump to main content.