The allocation, in the statute

A wastewater system serving multiple units is, in essentially every Hawaii declaration, a common element. That places it squarely in HRS § 514B-137(a): “Except to the extent provided by the declaration or bylaws, the association is responsible for the operation of the property.”

Conversion is therefore a common expense, funded through the budget under § 514B-144 and assessed by common interest — not billed to whichever owners happen to be nearest the tank.

And it should already be in the reserve study. Section 514B-148(c) requires reserves computed “based on the estimated life and the estimated capital expenditure or major maintenance required for each part of the property,” with separate, designated reserves for each part for which capital expenditure or major maintenance will exceed $10,000. A wastewater conversion clears that threshold by an order of magnitude.

The reserve horizon makes this current, not future: a cash flow plan is defined by § 514B-148(h) as a minimum thirty-year projection, and the new administrative rules at HAR ch. 16-119.6 carry the same floor and additionally prohibit “disproportionately and unreasonably” deferring funding into the last five years of that period.

2050 is inside the horizon of every reserve study being written in Hawaii today. A study that omits a shared cesspool is not conservative; it is incomplete.

The federal layer that does not wait for 2050

This is the part boards most often miss. Under the Safe Drinking Water Act’s underground injection control programme, large-capacity cesspools have been illegal federally since 2005, with per-day civil penalties. A large-capacity cesspool is broadly one serving multiple dwellings or a non-residential facility with capacity for a threshold number of people.

Many small Hawaii condominium and condominium-property-regime projects — concentrated on Hawaii Island, rural Maui and Kaua‘i — sit on exactly that kind of shared system. For those associations, the state deadline is not the operative one. The system is already unlawful, and enforcement is a federal matter that can arrive at any time.

We were not able to verify the current status of specific federal enforcement actions against Hawaii community systems, so treat the general rule as the reliable part and any particular enforcement report as unconfirmed.

What a board can do this year

• Establish what you have. Cesspool, septic system, aerobic treatment unit, or sewer connection — and whether it serves one unit or several. The answer determines which regime applies.
• Find your Department of Health priority ranking. Priority 1 sites face the earliest pressure and the strongest case for grant support.
• Put a line in the reserve study with a real cost estimate, not a placeholder. Section 514B-148(a)(6)(B) requires the computation explanation to identify any omitted component and the basis for the omission — so leaving it out is itself a disclosure event.
• Look at the financing routes. C-PACER was authorised for associations in 2024 and is used by the state’s own condominium loan programme as its security device; the HGIA cesspool loan proposal was moving in 2026.
• Disclose it on resale. A buyer who discovers a shared cesspool and a 2050 deadline after closing has a grievance, and the association is where it lands.

The honest caveat

At the current pace the state will not meet 2050, and county officials are already asking for extensions to 2060 and 2070. It is entirely possible the deadline moves.

That is not a reason to omit the cost from a reserve study. A funded reserve for work that is later deferred becomes a funded reserve for something else; an unfunded liability that arrives on schedule becomes a special assessment.

What to watch

Whether the HGIA loan programme for cesspool conversion is enacted and funded, whether the Department of Health grants county extension requests, and whether the 2027 session revisits the deadline itself.