Hawaiʻi Island Property Buyer Cesspool Due Diligence Checklist
Reviewing a property before purchase?
Send the address or TMK and describe the records or conditions that need a closer look. We will help connect you with the appropriate professional.
A listing description or seller statement may not provide enough information to understand the wastewater system. Review the records and arrange any needed professional evaluation during the inspection period, before applicable contingency deadlines.
Confirm the wastewater system type. Records and a qualified inspection can show whether the property uses sewer, a cesspool, a septic system, an aerobic unit, or another onsite system.
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 a qualified professional
- Start with Hawaiʻi Cesspool Help to share the property details and connect with a licensed professional
- Ask whether replacement appears feasible and what property information is still needed
- Identify likely survey, testing, access, excavation, retaining, electrical, or plumbing needs
- Request an estimate based on the property because online cost ranges may not fit the site
- 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 preserve the wastewater records at closing
- Verify the current status and terms of any grant, loan, or tax program before including it in the budget
Official lookup points
Send us the property information you have. We will connect you with a licensed professional who can evaluate the site and explain the next steps.