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On-site Waste Water Regulations (246-272A WAC)
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On-site Sewage System Maintenance Requirements for Home Sales


Selling your home?
You need to know …

The Revised Mason County On-site Sewage Regulations, Chapter 6.76, approved by the Board of County Commissioners on 4/7/2009, states:

  • Transfer of resident ownership shall require a current inspection service report on the status of the on-site sewage system, prior to closing, using the form prescribed by the Director.
  • Current shall mean within three years with a system consisting solely of a septic tank and drainfield and annually for all other on-site septic system.
  • Service for an on-site sewage system consisting solely of a septic tank and gravity drainfield shall be performed by a Mason County Certified Pumper or a Mason County Certified Operation and Maintenance Specialist. All other on-site sewage systems will require a report from a Mason County Certified Operation & Maintenance Specialist.

Click to see a list of Mason County Certified Pumpers or Operation & Maintenance Specialists.