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Mason County Washington - Government Information
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Office Hours
8:30 - 4:30 M-F
 
Environmental Health Home

Septic Home

On-site Waste Water Regulations (246-272A WAC)
On-site Sewage Regulations
On-site Standards
Environmental Health Fees
On-site Sewage System Management Plan
Requirements for Home Sales
Records Request Form
 
On-site Sewage Permits & Designs
Procedures for Obtaining an On-site Sewage Permit
Septic System Designers
Septic System Installers
Septic Record Drawing (Asbuilt) Form
Recreation Vehicle Holding Tanks
Recording Forms
Waiver/Appeal Form
Environmental Health Review (Loan Certification or Property Evaluation)
On-site Sewage System Operation & Maintenance

Information & Resources To Help You Maintain Your Septic System
O& M Program
Maintenance Schedule
Pumpers
Operation & Maintenance Specialists
Homeowner Inspection Forms
User’s Manual: Care and Feeding of Your On-site Sewage System
 
Maintenance Schedule & Required Service Providers
  • Maintenance for your septic system can be an inspection, service and/or repair, if necessary. The following maintenance schedule is defined in WAC 246-272A-0270 and includes a list of approved service providers for each system type.
  • Pumpers are certified to pump your septic tank and evaluate its condition.
  • Operation and maintenance specialists are certified to evaluate the functioning of all of the system components and make recommendations about necessary corrective actions.
  • Homeowners can submit inspection forms for certain types of systems. See chart.
  • Click here to see lists of Mason County Certified Pumpers and O & M Specialists or get a Homeowner Inspection Form.
System Type
Conventional
Non-Conventional
Conventional Gravity Conventional Pressure*

Open-bottom Sandfilter*
 Mounds*
Sandfilter*

Aerobic Treatment Units

Glendon

Recirculating Gravel Filters

Sub-surface Drip

Community Drainfields

 Non-residential

Commercial
         
Inspection Frequency
Every 3 years Annually Annually Annually Annually
(Waste – strength testing may be required)
         
Approved Service Providers
Homeowner

Pumper
 Homeowner

Pumper

Operation & Maintenance Specialist
 Homeowner

Operation & Maintenance Specialist
 Operation & Maintenance Specialist

Proprietary Device Licensee
 Operation & Maintenance Specialist
         
*Mason County Public Health recommends a Certified Operation and Maintenance Specialist inspect these systems.
Tanks should be pumped as needed. Frequency depends on age of system, number of people using system, size of tank, what you put into system, and other factors.