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Environmental Health Programs
On-site Sewage -
WAC 246-272A
If you are planning to construct a new home or other structure with plumbing
and will not be hooking up to a municipal sewer system, you will need an on-site
sewage system (OSS). It is required that you have an OSS permit issued and an
approved Water Adequacy Determination (Water Availability), before the building
department will release the building permit.
Step by step process to installing an on-site sewage system
- Site Evaluation
To obtain an OSS installation permit you will first
need to have a site evaluation on the proposed project parcel.
The site evaluation is performed by an Environmental Health
Specialist from the Kittitas County Public Health Department and
a Washington State licensed on-site designer. This evaluation of
soil and site characteristics will determine the suitability for
an OSS on the parcel. During the evaluation, the type of OSS
(gravity, pressure distribution, or alternative system), the
soil loading rate, and other landscape and environmental factors
will be determined. To obtain a site evaluation, submit the site
evaluation application (link to application is below) and fee to
the Kittitas County Public Health Department. The site
evaluation fee is $400.00 and is payable by check or cash only.
- OSS Design
After the site evaluation is complete, the next step will be to
have an OSS design prepared by a licensed on-site designer.
Homeowners wanting to prepare their own OSS system design are
allowed to do so, but only for gravity flow systems. If you wish
to prepare your own gravity flow system design, you are required
to schedule a pre-design meeting with an Environmental Health
Specialist and pay an additional fee of $215. All other types of
OSS systems must be designed by a licensed on-site designer.
- Installation
Once the OSS design has been reviewed and approved, an OSS
installation permit will be issued (fees for permit vary.) This
installation permit is valid for one year from the date of
issuance. A one-year renewal permit may be issued if the
application is submitted before the expiration date of the
original installation permit. Homeowners are allowed to install
their own OSS system. A Kittitas County OSS Installers license
is required for all septic system installers and septic tank
pumpers contracting work in Kittitas County. These licenses are
available through the Kittitas County Public Health Department.
- Inspection
All OSS systems installed must be inspected by an Environmental
Health Specialist prior to back fill. The installer or designer
may schedule these inspections directly with the Kittitas County
Public Health Department.
Inspections
Licensed designer and installers may request an inspection online.
You will receive a confirmation email once the requested inspection has been
scheduled.
View scheduled inspections >
More Information
Contact: Joe Gilbert, Environmental Health Specialist II, (509) 933-8262,
environmentalhealth@co.kittitas.wa.us
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