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Onsite Sewage Permits

Permit definitions, forms and fee information for onsite sewage disposal systems.

Permit applications for properties located within Washington County must be made through Environmental Health. Permits are required for the installation of new onsite sewage disposal systems and for the repair or alteration of existing systems, septic tanks or drainfields. Permits fall within one of these three categories:

  • Alteration Permits are required for the expansion or change in location of an existing onsite septic system or any portion or component of the system. A Minor Alteration is the replacement or relocation of a septic tank or other components of the system excluding the drainfield. A Major Alteration is the expansion or change in location of the drainfield, septic tank and drainfield, or any part of  the drainfield.

  • New Construction Permits are required for the installation of a new onsite septic system to serve a new residence or commercial facility. System requirements and the approved location for the new system are found on the Site Evaluation Report. The new system may be a sand filter, recirculating gravel filter (RGF), alternative treatment technology (ATT), capping fill, standard system or another type of system which will be specified on the report.

  • Repair Permits are required for the installation of all or portions of a septic system necessary to eliminate a public health hazard or pollution of public waters created by a failing septic system. A Minor Repair is the replacement of a septic tank and/or other portions of the septic system other than a sand filter, recirculating gravel filter (RGF), alternative treatment technology (ATT) or the drainfield. A Major Repair is the replacement of a sand filter, RGF, ATT and/or the drainfield.

Forms and Applications 

NEW! Washington County has launched the Washington County Public Permitting and Services Portal, an online system to allow the community to better connect with County services.

Visit the Public Permitting and Services Portal to submit septic applications. First-time users need to complete the one-time account registration process. Watch the How-to-Register video. Once an account is created, you can obtain septic permits, track status, search for permits, schedule an inspection and view results. 

If you prefer not to apply online, the following information is available in packets or to download individually:

New Construction and Alteration

Sample Plot Plan (PDF 437.33 KB)
System Design  (PDF 431.97 KB)


Sample Plot Plan (PDF 404.73 KB)
System Design (PDF 431.97 KB)
Repair Permit Packet (PDF 2.28 MB)