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Conditions for approving different water sources in King County
Group A Water systems
- For new development, you must provide a Certificate of Water Availability (236 KB) from the Group A saying they are willing and able to supply water to the property.
- For properties already connected to a Group A, a copy of the water bill or similar verification they are connected will be acceptable.
Group B Water Systems
- Only approved Group B water systems may be used as an approved water source
- Individuals seeking to use a Group B water system for their project should be able to provide a water system approval letter:
- For Water systems created before 2011 that were approved by King County, check the King County Septic and Group B Records
- For water systems created after 2011 that were approved by the state Department of Health, contact the water system purveyor/manager for available records
- Provide evidence that the property is authorized to connect to the water system, according to its originally approved design. Group B systems cannot allow more connections than approved in the original design, unless it goes through an official expansion process. Evidence includes:
- Approval letters
- Approved designs
- Water use agreement
- Informational notices on title
- Certificate of Water Availability from the purveyor of Group B
- Using a Group B water system for an onsite sewage system requires:
- Satisfactory water quality test results within the last year
- Satisfactory pump test results
- A 100' protective radius around the well free from potential contamination sources
- You must show the necessary covenants protecting the water source:
Individual private wells
- New or existing wells must receive department approval for on-site sewage system projects.
- Using a private well for an onsite sewage system requires:
- Satisfactory water quality test results
- Satisfactory pump test results
- Existing wells may be required to provide pump test results
- A 100' protective radius around the well free from potential contamination sources
- You must show the necessary covenants protecting the well:
Existing private spring
- Existing private springs must receive department approval for on-site sewage system projects
- Using an existing private spring for an onsite sewage system requires:
- Satisfactory water quality test results
- A 200' protective radius around the well free from potential contamination sources
- You must show the necessary covenants protecting the spring: