Methodology for Iowa’s 2020 Water Quality Assessment, Listing, and Reporting Pursuant to Sections 305(b) and 303(d) of the Federal Clean Water Act.

(2021) Methodology for Iowa’s 2020 Water Quality Assessment, Listing, and Reporting Pursuant to Sections 305(b) and 303(d) of the Federal Clean Water Act. Natural Resources, Department of

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Abstract

Iowa’s 2020 assessment and listing methodology incorporates recommendations in EPA’s historical [305(b)/303(d)/Integrated Reporting] guidance as well as the current guidance for the 2020 assessment, listing, and reporting requirements pursuant to Sections 303(d) and 305(b) of the federal Clean Water Act (EPA 2015). EPA guidance establishes the formats for an “integrated report” (IR) that satisfies the listing requirements of Section 303(d) and the reporting requirements of Sections 305(b) and 314 of the Clean Water Act (CWA). The current EPA 2015 guidance replaces all previous guidance pertaining to Sections 305(b) and 303(d) except EPA’s Consolidated Assessment and Listing Methodology (CALM) (EPA 2002). Due to the continued lack of details regarding the mechanics of CWA-related water quality assessment in more recent EPA guidance (e.g., EPA 2002), Iowa Department of Natural Resources (Iowa DNR) continues to use assessment methods described and recommended in previous EPA guidance for Section 305(b) reporting (EPA 1997). Iowa DNR uses the 1997 guidance only in cases where EPA’s more recent guidance is inadequate. Iowa DNR’s 2020 methodology generally meets the requirements of CWA, Section 303(d)(1)(a) and 40 CFR Section 130.24 and incorporates requirements of Iowa’s credible data law (2001 Iowa Code, Section 455B.194, subsection 1).

Item Type: Departmental Report
Keywords: DNR, Clean Water Act, Iowa EPA
Subjects: Natural resources and environment > Water resources > Lakes
Natural resources and environment > Water resources > Rivers and streams
Natural resources and environment > Water resources > Water quality
ID Code: 35257
Deposited By: Mr Jamie Mootz
Deposited On: 22 Feb 2021 12:57
Last Modified: 25 May 2021 20:29
URI: http://publications.iowa.gov/id/eprint/35257