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Environmental Health

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NEW OSS Loan Program

NEW OSS Operation & Maintenance Requirement

OSS Regulations

OSS Permit Process

Forms & Applications

Licensed Designers

Licensed Installers

Licensed O&M Specialists

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Homeowner Certification Training

The Whatcom County Code allows homeowners who become certified to complete evaluations of their on-site sewage systems (OSS), except for the following:

  1. Proprietary OSS technologies, i.e. aerobic treatment units (ATU’s), Biofilters, Drip irrigation;
  2. Community drainfields, i.e. an OSS that serves more than one residence;
  3. OSS that have been repaired and were considered non-conforming at the time of permit issuance due to the site conditions;
  4. OSS that are serving food service establishments;
  5. Evaluations for the purposes of property transfers.

Property owners are not eligible to evaluate their OSS when a property is offered for sale.  A Licensed Operation and Maintenance Specialist must be hired to perform these evaluations. 
All gravity, non-pressurized mound (gravity mound), pressure distribution, pressure mound, and sand filter OSS may be evaluated by homeowners.  To determine your system type, refer to your OSS permit if you have a copy.  The system type is usually noted on the front page. 
If there is no permit available for your OSS, it is most likely a gravity system.  If you do not know your system type, contact our office at (360) 676-6724 or via email at Health_EH_Parcel@whatcomcounty.us.


Homeowner Online Training
We have developed the following Homeowner Online Septic Training (HOST) materials to facilitate online homeowner training and certification to evaluate your own OSS.  Please follow the steps listed below to complete the process.


After completion of your evaluation, please submit the HROSS form, your certificate of completion, and $35 to the Whatcom County Health Department.

For a fee of $0.15 per page, you may also obtain hard copies of the HOST study guide and HOST presentation from our office.

Homeowner Classroom Training
We will still offer classroom style training.  The date and time of the 2012 classes scheduled are as follows:

  • March 6, 2012
  • April 10, 2012

The classes listed above will be held from 6:00pm – 9:00pm at St. Luke's Health Education Center, Room A (3333 Squalicum Parkway, Bellingham).  If you would prefer to attend one of these courses, please send an email to Health_EH_Parcel@whatcomcounty.us or click here and include all of the following information:

  • The date you would like to attend
  • Name of attendee(s)
  • Address of the property served by the on-site sewage system
  • Phone number