Approval to Construct Through Final Approval
Direct answer: After DOH approves an individual wastewater system design for construction, what must happen before the new system has final approval to use?
Approval to construct is permission to build the approved design
When the Hawaiʻi Department of Health Wastewater Branch accepts the IWS plans, the project can move into construction. That approval applies to the reviewed design. It is not the final approval to operate the system, and it does not authorize unreviewed field changes.
Keep the approved plans and approval letter available to the engineer and contractor. If site conditions force a change, the engineer should determine whether the change can be accepted and documented or needs additional agency review.
Hire the correct licensed contractor
DOH’s homeowner guidance says construction must be performed by a contractor holding an accepted license class, such as A, C-9, C-37, C-37a, or C-43. Plumbing or electrical work may require additional licensed trades depending on the project. Verify the current license class and status through DCCA before signing.
The engineer and contractor have different roles. The contractor builds the system. The engineer is responsible for design and construction-inspection documentation within the engineer’s scope.
Engineer monitoring and field documentation
DOH says the licensed civil engineer should monitor construction. At the end of construction, the engineer submits the IWS Construction Inspection Report together with the completed Contractor Certification Form.
Photographs, measurements, product information, delivery records, and notes taken before components are covered can help document what was installed. The exact documentation needed should be coordinated with the project engineer before backfilling.
Resolve discrepancies before closeout
Chapter 11-62 requires discrepancies identified during inspections to be resolved before written approval to use is issued. The engineer’s final report must certify that the system was installed according to the approved plans, or that changes are accepted by the engineer, and must include as-built information.
Do not assume that passing a contractor inspection, completing plumbing work, or covering the system is the same as receiving DOH approval to use.
Approval to use is the final operating authorization
DOH issues the approval-to-use letter when the required closeout forms are accepted and no unresolved discrepancies remain. DOH’s homeowner page states that it cannot issue final approval without the engineer’s construction inspection report and contractor certification, and that a new IWS is noncompliant without approval to use.
Keep the approval-to-use letter, approved plans, as-built drawing, inspection report, contractor certification, equipment information, and maintenance agreement together with the property records.
A practical closeout checklist
- Confirm the contractor and any specialty trades have the correct active licenses.
- Give the contractor the approved plans and coordinate inspection points with the engineer.
- Do not approve unreviewed field substitutions or cover required inspection areas prematurely.
- Have the engineer complete the final inspection and as-built documentation.
- Confirm the contractor certification is signed and complete.
- Wait for written DOH approval to use before treating the system as fully closed out.
- Store the final records where a future owner can find them.
Official sources
- Hawaiʻi Department of Health Wastewater Branch — Individual Wastewater Systems
- Hawaiʻi Administrative Rules Chapter 11-62, unofficial searchable version
- Hawaiʻi DCCA Professional and Vocational Licensing Search
This article provides general homeowner information, not legal, engineering, real-estate, lending, or health advice. Property conditions and current agency requirements control. Hawaiʻi Cesspool Help coordinates between homeowners and licensed professionals and does not provide engineering services directly.