Can You Buy or Sell a Home with a Cesspool in Hawaii?

Can You Buy or Sell a Home with a Cesspool in Hawaii?

Yes, homes with cesspools can still be bought and sold in Hawaii. A cesspool is not automatically a deal killer. But it is something buyers and sellers need to understand before getting too far into a transaction.

On Hawaii Island, cesspools are still common, especially in rural areas where sewer infrastructure does not exist. That means wastewater systems can affect disclosure, inspections, financing, negotiations, future conversion costs, and long-term property value.

The short version is this: Hawaii’s statewide cesspool conversion deadline remains January 1, 2050, under Act 125. Recent legislation, including HB1618 in 2026, focused on financial assistance for cesspool conversion. HB1618 did not create a statewide point-of-sale conversion requirement or change the 2050 deadline.

What is a cesspool?

A cesspool is an underground wastewater disposal system that receives sewage from a home or building. Unlike a modern septic system or sewer connection, a cesspool does not provide the same level of wastewater treatment before waste enters the surrounding ground.

That matters in Hawaii because many properties are located in areas with porous lava rock, coastal impacts, high groundwater sensitivity, or limited public sewer options. On Hawaii Island, this is not just an environmental issue. It is also a real estate issue.

What is Hawaii’s 2050 cesspool deadline?

In 2017, Hawaii passed Act 125, which requires cesspools in the state to be upgraded, converted to Department of Health-approved wastewater systems, or connected to sewer systems by January 1, 2050, unless excluded by the Director of Health.

That deadline is important, but so is the source of the deadline. Hawaii’s statewide 2050 cesspool conversion deadline is a state law requirement. It is not the same thing as the older federal EPA rules that applied to large-capacity cesspools, including certain shared systems.

Did HB1618 change the deadline?

No. HB1618 was a financing measure. It created a Cesspool Conversion Revolving Loan Fund through the Hawaii Green Infrastructure Authority to help eligible homeowners with low-interest or forgivable loans for cesspool upgrades, conversions, or sewer connections.

That is a big difference. A loan fund is not the same thing as a new conversion mandate at sale.

For buyers and sellers, the key takeaway is simple: HB1618 may help create a financing pathway for some homeowners, but it does not mean every cesspool must be converted before a property can be sold.

Does a seller have to convert a cesspool before selling?

As of now, there is no statewide point-of-sale cesspool conversion requirement in Hawaii. That means a seller generally does not have to convert a cesspool simply because the property is being sold.

But that does not mean sellers can ignore it.

A seller still needs to disclose known material facts about the property. If the property is served by a cesspool, that should be clearly understood and disclosed through the proper real estate disclosure process. If there are known issues, prior repairs, notices, shared-system concerns, or wastewater problems, those details matter.

What should sellers disclose?

Sellers should be prepared to disclose what they know about the wastewater system serving the property, including whether the property is served by a cesspool, septic system, or sewer connection; whether the system is private or shared; and whether there have been known problems, repairs, backups, notices, inspections, or other issues.

The goal is simple: avoid surprises.

Wastewater systems can become a much bigger problem if they are discovered late in the transaction. Buyers, lenders, appraisers, inspectors, and underwriters may all have questions depending on the property and the type of system involved.

What should buyers ask?

If you are buying a home on Hawaii Island, ask early what type of wastewater system serves the property. Do not assume every home is connected to sewer. Many are not.

Good buyer questions include:

What type of wastewater system serves the property?
Is it a cesspool, septic system, or sewer connection?
Is the system private or shared?
Where is it located?
Are there permits or records available?
Has the system been inspected?
Has the seller had any problems with it?
Is the property in a priority area?
What would conversion likely involve?
Could the lender have an issue with the system?

These are not small questions. On some properties, wastewater can affect cost, timing, financing, and future use.

Can a cesspool affect financing?

Yes, it can.

A normal private cesspool is not automatically a financing problem today, but wastewater compliance can become a financing issue depending on the property, the lender, and the type of system involved.

I saw this firsthand in Kona in 2005 when shared “gang cesspools” serving multiple homes became a major problem. Those systems were treated as large-capacity cesspools under federal EPA rules. Once lenders determined those systems were not compliant, financing stopped. In the local real estate community, they quickly became known as deal killers.

That history matters because it shows how wastewater rules can affect more than compliance. They can affect marketability, lending, and whether a sale can close.

Why does this matter so much on Hawaii Island?

Hawaii Island has a large number of cesspools, and many are located in rural areas where public sewer is not available. That makes this issue especially important for Big Island buyers and sellers.

In some areas, conversion may be relatively straightforward. In others, cost, design, access, soil conditions, lava rock, lot size, shoreline proximity, or lack of nearby sewer infrastructure can make the issue much more complicated.

What buyers and sellers should take away

Cesspools are not automatic deal killers in Hawaii today. Homes with cesspools can still be bought and sold. But buyers and sellers should not treat wastewater as a minor detail.

For sellers, the key is disclosure, documentation, and avoiding surprises.

For buyers, the key is asking the right questions early, understanding the system, and making sure inspections, financing, and future costs are considered before closing.

For Hawaii Island specifically, this is one of those local issues where experience matters. Cesspools, lava zones, private roads, water systems, insurance, zoning, and infrastructure are all part of understanding real estate here. They can directly affect property value, buyer decisions, and long-term ownership.

Aloha and Mahalo,