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On-site Products and Systems
Approved for Use
in Washington State

On-site Wastewater Publications Table of Contents

On-site Wastewater Management Program Home Page

Publication	Description	Format
Application form to register Proprietary Distribution Product	Application form for applying to register a proprietary on-site distribution product in Washington State.	159 kb	46 kb
Application form to register Proprietary Treatment Product	Application form for applying to register a proprietary on-site treatment product in Washington State.	160 kb	45 kb
Proprietary Product Registration Renewal - Verification Affidavit	This affidavit must accompany proprietary product registration renewal applications.	149kb	36 kb
List of Registered On-site Treatment and Distribution Products	List of on-site septic systems and products that are allowed to be used in Washington State. (Updated May 5, 2008)	623 kb	175 kb
Septic Tank Additives (Questions and Answers)	Journal article, Question & Answer from The Small Flows Quarterly, Winter 2002, reprinted with permission from the National Small Flows Clearinghouse, West Virginia University.		121 kb
Sewage System Additives: List of additive products approved for use in sewage systems)	List of products approved for use in sewage systems. (Updated January 18, 2008). Note:  Approval by DOH only means that DOH has determined that the additive is not harmful or toxic; it does not mean that DOH endorses the use of any additive product for sewage systems.	237 kb	130 kb
Sewage Tanks, List of Approved	List of sewage tanks permitted to be used in Washington State. (Updated May 7, 2008)	696 kb	149 1kb

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Links to external resources are provided as a public service, and do not imply endorsement by the Washington State Department of Health.

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This page contains links to documents that may be in one of the following formats: 

• .pdf  (Adobe Acrobat Reader),

• .doc  (Word),
• .ppt  (PowerPoint),
• .xls  (Excel),
• etc....;

If your computer is not able to read these formats, you may visit the DOH Viewer Page to locate the appropriate free viewer or converter to download to your computer.

For copies of the above Wastewater Management Program publications, or to request document in other formats, please contact the Wastewater Management Program at (360) 236-3062 or e-mail wastewatermgmt@doh.wa.gov.

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Links to external resources are provided as a public service and do not imply endorsement by the Washington State Department of Health.

Wastewater Management Program
Office of Shellfish and Water Protection
Division of Environmental Health
Washington State Department of Health
PO Box 47824
Olympia, WA  98504-7824
Ph.    360-236-3062
Ph.    360-236-3330
FAx:  360-236-2257

Send inquiries about DOH and its programs to the Health Consumer Assistance Office.
For comments or questions regarding this Web site, please send email to OSWP Web Coordinator.

Last Update : 05/12/2008 09:22 AM