The primary purpose of the certification credential is to set a standard of practice and create a baseline of knowledge for onsite wastewater system installations. Iowa counties are encouraged to adopt regulations providing for licensing of installers and to require CIOWTS certification. Counties currently requiring the CIOWTS credential are Benton, Black Hawk, Bremer, Buchanan, Butler, Chickasaw, Dallas, Delaware, Floyd, Grundy, Jasper, Linn, Marion, Scott, Story, Warren, Washington, and Winneshiek. Please check with your county for specific requirements.
Through a contract with the National Environment Health Association (NEHA), IOWWA will process all IOWWA CIOWTS test applications and manage all renewals.
To review members and non-members who have the CIOWTS credential, please refer to the "CIOWTS List as of June 1, 2017, Members and Non-Members" PDF file in the Documents & Files section below.
If you are interested in obtaining the CIOWTS credential, please review the IOWWA CIOWTS Quick Facts sheet found in the "Documents and Files" section below. The CIOWTS Test Application can also be downloaded and printed from this section.