Who approves the new system
The Department of Health Wastewater Branch reviews and approves individual wastewater systems (IWS), such as septic systems and aerobic treatment units, that replace cesspools.
The steps
- Hire a licensed engineer. A Hawaiʻi licensed civil engineer designs the system. DOH keeps a list of engineers who design wastewater systems.
- Get your TMK. Your tax map key identifies the parcel on every form.
- Site evaluation and percolation test. The engineer tests how your soil drains, which drives the system type and size.
- Plan submittal. The engineer submits plans online through the DOH wastewater portal, along with the application, owner certification and site evaluation forms.
- Hire a licensed contractor. DOH says the system must be built by a contractor with an A, C-9, C-37, C-37a or C-43 license. You can check a license on the DCCA Professional and Vocational Licensing search.
- Construction and final approval. The engineer monitors construction, then submits an inspection report and contractor certification. DOH then issues approval to use the system.
Sewer connections
If you are connecting to city sewer instead, the City and County of Honolulu handles the connection, and the old cesspool still has to be properly closed. Ask your contractor which agencies apply to your lot.
Tip
Many contractors work with an engineer they know, so one quote can cover design, permits and installation. Request a free quote.
Sources: DOH Individual Wastewater Systems; DOH engineer list; DCCA license search