For a lot of older homes in Kailua, the wastewater system is a cesspool, a concrete-lined pit that sends untreated sewage straight into the ground. Buyers often connect a cesspool to the thing they've already heard about Kailua's waterways: the algae on Enchanted Lake, the occasional brown-water advisory at the beach, the smell some longtime residents complain about when the stream mouth opens. It's a reasonable jump to make. It's also not what the science says, and understanding the gap between the two matters at your closing table.
What Buyers Should Confirm
Confirming it means requesting records from the state Wastewater Branch using the property's Tax Map Key. If the state has no record on file, someone needs to look closer, usually a plumber or the home inspector, before the buyer assumes anything about what's actually in the ground.
The Water Story Everyone Repeats
Kailua's most repeated water complaint centers on Kaelepulu Pond, better known as Enchanted Lake, and the stream that carries its overflow to Kailua Bay. The pond sits at the bottom of a 2,500-acre watershed and was built out starting in 1959, when fill from nearby construction projects turned what had been a much larger Hawaiian fishpond and marsh into the private lake that anchors the Enchanted Lake Estates subdivision. The Enchanted Lake Residents Association has managed roughly 89 acres of that water since 1989, running an algae harvester and tracking water quality through repeated testing.
Some residents have described the water that discharges into Kailua Bay as foul-smelling and blamed it on sewage, according to Kailua Waterways, a local group that has compiled water quality data on the system since the 1990s. It's an understandable read given the history: Kailua didn't have a wastewater treatment plant until 1965, and before that, homes around the pond used cesspools or ran waste directly into the stream.
What the Testing Actually Found
That history is real. The current pollution isn't the same story. Kailua Waterways points to nine separate water quality studies conducted since 1992, and none of them found evidence of human sewage or EPA priority pollutants distributed through the system. High bacteria counts showed up only at isolated spots, not consistently across the watershed, and the group notes that the wetlands feeding the pond are themselves a natural source of the same bacteria strains people associate with sewage.
What the studies do point to is stormwater. Roughly 8.6 miles of city storm drains, carrying runoff from about 28 miles of paved roads, feed directly into the pond with no filtration, according to the EPA's watershed assessment. That's sediment, fertilizer, and trash from daily life across Kailua, not leakage from a specific home's wastewater system. The cesspool issue and the water quality problem are, for the most part, two separate issues that happen to share a neighborhood.
That distinction matters for how a buyer should actually price the risk. A cesspool on a property near Kaelepulu Stream isn't evidence that the home is actively polluting anything. It is evidence of a cost that's coming due on a schedule the state controls, and that schedule is where the real transaction risk lives.
The Deadline Hasn't Moved, but the Financing Did
Act 125, passed in 2017, requires every cesspool in Hawaii to be upgraded, converted to septic, or connected to sewer by January 1, 2050. Several bills introduced in the 2026 legislative session would have moved that deadline up for high-priority cesspools or created a standalone disclosure form specific to wastewater systems. None of those passed this session. The 2050 deadline stands as written.
What did pass is a financing tool, and it's the piece of this story that's actually new. On July 8, 2026, Governor Josh Green signed House Bill 1618 into law as Act 204, creating a Cesspool Conversion Revolving Loan Fund administered by the Hawaii Green Infrastructure Authority. State Senator Chris Lee, who represents Kailua and Waimanalo, called it a way to make conversion possible for the families who need it most.
The program details, including how to apply and what qualifies, are still being built out by the Hawaii Green Infrastructure Authority. For a Kailua seller sitting on an older cesspool property, that's the more useful thing to track this year than the 2050 date itself, since it changes what a buyer's carrying cost actually looks like.
What Conversion Costs Right Now
Current estimates cited in this year's legislative analysis put conversion costs at $30,000 to $50,000 per property, depending on lot conditions, and that's the number a buyer or lender is more likely to underwrite against today.
| Then | Now | |
|---|---|---|
| Typical conversion cost | $20,000 to $30,000 | $30,000 to $50,000 |
That gap is worth sitting with before an offer goes in. A buyer running the math on a Kailua property with a known cesspool is pricing against a $30,000 to $50,000 expense with a financing mechanism that exists on paper but isn't fully operational yet.
How This Plays Out at the Closing Table
For anyone actively under contract or preparing to list an older Kailua or Kaneohe home, the practical sequence looks like this:
- Pull the property's Tax Map Key and request wastewater records from the state's Wastewater Branch to confirm what system is actually on file, since a pumping receipt only proves something was pumped, not that the system is legal or properly sized.
- Ask whether the parcel sits near a stream, wetland, or drinking water source, since that proximity is exactly what the Hawaii Cesspool Prioritization Tool uses to sort cesspools into its three priority tiers.
- Confirm with a lender early whether the loan program being used requires any representation about wastewater compliance, since scrutiny on this point varies by lender and loan type.
- Get a home inspector or licensed engineer's read on the physical condition of the system rather than relying on the seller's description alone.
- Watch the Hawaii Green Infrastructure Authority's rollout of the new loan fund if a conversion is part of the near-term plan, since eligibility rules are still being finalized.
None of this requires panic. It requires the same discipline any Hawaii transaction with an older system deserves: verify the paperwork, price the real cost, and separate what the checkbox is telling you from what it isn't.
A Short FAQ
How do I know if my parcel is in a high-priority area? The Hawaii Cesspool Prioritization Tool is a public, parcel-level map built from statewide environmental data. A property near a stream, wetland, or drinking water source, the kind of geography common around the Kaelepulu and Kawainui watersheds, is the profile that tool was built to flag.
If you're weighing a purchase near Kailua's waterways, or getting ready to list a home with an older wastewater system, it helps to have someone who's already read the disclosure form the way a lender will. Mavis Nellas can walk through what's actually on file for a specific property and what it means for your offer or your listing price. Schedule a free consultation to get that read before you're staring at it during escrow.
This article is general information, not legal, tax or financial advice. Consult a qualified professional about your situation.
