Environmental Health
Surface Water (Lakes, Rivers & Streams)
Henderson WPA Septic System O&M Program
  Henderson Watershed Protection Area  

Septic System Operation & Maintenance Program

Henderson Inlet Shellfish Protection District

NEW Notice of Public Hearing
When:  Tuesday, November 14, 2017 at 5:30 p.m.
Where: Thurston County Courthouse
            2000 Lakeridge Drive SW, Olympia WA 98502
            Building 1, Room 280

Ordinance Amending Article IV of the Sanitary Code for Thurston County and the Henderson Inlet Operation and Maintenance Program

Henderson Watershed Protection Area Map


Background information on the Henderson Watershed Protection Area (HWPA) Septic System Operation and Maintenance Program and why it was implemented. ...more

Program Basics

Learn who is included, what is required, and other information regarding the HWPA Septic System program. ...more

Operational Certificate Renewal

Find out what is needed to renew the Operational Certificate. ...more

Homeowner Septic Inspection Certification

HWPA Septic O&M Program homeowners can be certified to inspect their own septic systems. For dates, times, or to sign up, see Septic System Inspection Certification.

Septic System Financial Assistance

Low-interest loans and grants are available to help HWPA and other County homeowners maintain existing systems and repair failing ones. ...more


Find out answers to questions about the HWPA Septic System Program ...more

Program Updates and Accomplishments

Get program updates and find out how the program is doing so far. ...more

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  • Henderson O&M Questions
This page last updated: 11/09/17