October 8, 2026
The Honolulu Star-Advertiser reported that Roger Babcock, director of Honolulu's Department of Environmental Services, said to the City Council in March 2025, "So the homeowners will currently kind of be on their own." He was describing the parts of Oahu where the city has no plans to run sewer lines. He named the North Shore as one of them. Anyone selling a home in Haleiwa should read that sentence twice, because it explains why one checkbox on the Seller's Real Property Disclosure Statement carries so much weight.
The form asks whether the property has a cesspool, a septic system or an individual sewage treatment plant. It asks where the system sits, when it was last pumped, how often, and whether the cesspool serves more than one dwelling, including ohana homes. The state deadline for all of this is January 1, 2050, and a deadline more than two decades away is easy to wave off. A buyer's math starts earlier than that. It starts on the day they file for a building permit, and the size and cost of the system they will owe on that day depend on how many bedrooms the house counts as having.
That makes paper the seller's strongest asset. The rest of this post lays out why.
Act 125 of 2017 requires every cesspool in the state to be upgraded, converted or connected to sewer by January 1, 2050, and the EPA's Hawaii cesspool page confirms that the Department of Health's rules apply to cesspools of any size.
Other events do force the issue. The Department of Health's published guidance lists the situations where an upgrade is required before 2050:
| Event | Upgrade required? |
|---|---|
| Statewide deadline, January 1, 2050 | Yes, for every cesspool |
| Adding a bedroom or an ADU | Yes |
| Pumped more than twice, or spilled more than once, in 12 months | Yes |
| Changing the property from residential to commercial use | Yes |
The Department of Health's wastewater FAQ comes from its Kauai district office. It also says the decision on any specific project is made at the building permit stage, and that advice given beforehand is non-binding. Anyone in Haleiwa should confirm their own parcel with the Wastewater Branch using the tax map key.
Look at the middle of that table. Bedrooms, ADUs, lanais and bathrooms are all on that list, and any of them can end a cesspool's quiet run. A cesspool that would happily last until 2050 under the current owner can become a permit-day expense for the next one.
The clearest illustration of how this works in Haleiwa comes from an Environment Hawai'i report from 2021 on a Ke Nui Road home. The house was a three-bedroom, two-bath with a cesspool at least 10 feet deep. The Department of Health designs individual wastewater systems at 200 gallons per day per bedroom, so the existing design flow was 600 gallons per day. The owners planned to add a bedroom and a den. The department treats a den as a bedroom-like room, so the design became five bedrooms at 200 gallons each, or 1,000 gallons per day.
The bigger system ran into a second problem. Department rules require a leach field to sit at least 50 feet back from the shoreline, and the small backyard could not meet that. The engineer filed for a variance. The head of the Wastewater Branch said the department would begin requiring a certified shoreline survey as a condition of similar variances.
That story is five years old, so treat it as a picture of how sizing works and not as a current case. The lesson still applies to a Haleiwa listing today. Design flow follows the rooms the department accepts, and a lot with a short setback distance can turn a bigger system into a variance application. If a listing has a den, a converted garage or an ohana unit, the bedroom count on the disclosure, the permit history and the wastewater system are three answers to one question. A seller who has already reconciled them is holding the number that sets the size of the conversion.
In April 2026, Stuart Coleman of Wastewater Alternatives and Innovations told the Honolulu Star-Advertiser that conversions run roughly $25,000 to $45,000, with certain properties costing more. The same reporting says the entire North Shore is considered to have high-priority cesspools, with heavy concentrations in Waialua, Haleiwa, Mokuleia, Pupukea and Laie. It also quotes a University of Hawaii researcher saying 15 feet of separation between the bottom of a cesspool and the groundwater table is needed for effective treatment, and that coastal lots often have far less.
The Sea Grant Cesspool Prioritization Tool ranks each cesspool in three tiers. Priority 1, shown in red, covers cesspools directly adjacent to sensitive assets such as coral reefs or drinking water aquifers. Priority is a ranking of urgency. As of August 2026, reporting says it does not create a separate legal replacement date.
Sewer would be the cheaper route where it exists. Honolulu officials floated connections costing homeowners $8,500 to $10,000 in some areas back in 2024. Babcock's 2025 testimony, though, was that most cesspools sit in areas the city does not plan to sewer, and the roughly 3,000 connections in the city's capital plan fall inside the service areas of existing treatment plants. Reporting in 2023 said the city was studying connections for Haleiwa, Kahuku and Waimanalo, and I found no later commitment to build them. A Haleiwa seller should not price a sewer hookup into the conversation.
On July 8, 2026, Gov. Josh Green signed HB 1618, now Act 204. It creates a Cesspool Conversion Revolving Loan Fund run by the Hawaii Green Infrastructure Authority, offering low-interest or forgivable loans to eligible homeowners. The Hawaii Tribune-Herald reported an initial allocation of $2 million, set against a conservative estimate of $2.4 billion to convert more than 80,000 cesspools statewide if the work were done today. The authority still has to set the loan terms, and reporting as of August 2026 describes the program as under development.
The Honolulu Star-Advertiser reported that an earlier state program offered grants of up to $20,000. In 2023, that $5 million ran out in about two weeks, and the pilot has since ended. A seller can tell a buyer that a loan program now exists. A seller cannot promise that it will have money, or what it will require, when escrow closes.
Island-wide figures from the Honolulu Board of REALTORS for August 2026 show the Oahu single-family median up 12.2% year over year. Houses spent a median of 17 days on the market and sold at a median of 100% of original asking price, with 33% closing above asking, according to List Sotheby's monthly summary. Those are island-wide numbers, and Haleiwa's small sales counts produce medians that swing too widely to quote.
Still, in a market where houses clear at full asking, a quotable conversion cost is one of the few concrete items a buyer can bring to the table. The March 2026 Kona low storms added to that. They brought brown-water advisories across Oahu and a March 21 boil-water notice for Waialua and Haleiwa, which put wastewater in the headlines this spring. A seller with a written quote and clean records answers the question before it becomes a credit request.
Do I have to convert before I sell? Confirm with the Department of Health for your parcel.
Is there a new cesspool disclosure form? A 2026 bill, HB 1749, proposed a separate cesspool disclosure form starting January 1, 2027. The bill text I reviewed carries a placeholder effective date of July 1, 3000, and I could not confirm it became law. Use the current Hawai'i Association of REALTORS form and ask whether a revision has been released.
Can I count on the new state loans? The fund exists, and the terms are still being set. Treat it as a possibility a buyer can research, and price the conversion as if you were paying cash.
If you own in Haleiwa and want to walk through the wastewater line on your disclosure before you list, Lex Ferguson can help you pull the records, sort out the bedroom count and decide what belongs in the packet. Let's Connect.
This article is general information, not legal, tax or financial advice. Consult a qualified professional about your situation.
Let’s dive into why owning a home is still the golden ticket to achieving the American Dream!
With deep Oahu knowledge, 24/7 availability, and a tireless commitment to his clients, Lex is ready to help you move forward with confidence every step forward.