Hawaiʻi Island Property Buyer Cesspool Due-Diligence Checklist
A listing description or seller statement rarely gives enough information to price wastewater risk. Complete this review during the inspection and due-diligence period, before the contingency deadlines expire.
Do not assume that “septic” is accurate. Confirm whether the property uses sewer, a cesspool, a septic system, an aerobic unit, or another onsite system through records and qualified inspection.
Property and record review
- Confirm the TMK, legal owner, address, lot size, zoning, and permitted structures
- Ask for the cesspool card, IWS approval, plans, permits, inspection reports, and approval-to-use letter
- Compare the bedroom count and dwelling count in records with the property as built
- Ask for pumping, repair, overflow, odor, and service history
- Locate the wastewater system and disposal area on a plan or at the site
- Check whether additions, kitchens, bathrooms, rentals, or change of use may affect requirements
- Confirm sewer availability rather than assuming a future connection is possible
Professional review
- Have the wastewater system inspected by an appropriate qualified professional
- Ask a Hawaii-licensed civil engineer whether replacement appears feasible on the lot
- Identify likely survey, testing, access, rock excavation, retaining, electrical, or plumbing needs
- Obtain a property-specific planning estimate instead of relying on generic online cost ranges
- Verify professional and contractor licenses through DCCA
Contract and financing questions
- Decide whether additional investigation is needed before the inspection contingency ends
- Discuss repair credits, escrow, price adjustments, or seller completion with the real-estate and legal professionals involved
- Ask the lender and insurer whether wastewater condition or planned work affects approval
- Confirm who will own, control, and preserve the wastewater records at closing
- Do not treat possible grants, loans, or tax programs as guaranteed funds
Official lookup points
Get Property-Specific Coordination
This resource is general information, not engineering, legal, tax, real-estate, or permitting advice. Requirements vary by property. Confirm decisions with the applicable agency and Hawaii-licensed professionals.