What a Sewer Plant in Waikapū Has to Do With Wailuku Home Prices

Wailuku's single-family median dropped 13.3% in the first eight months of 2026. Kahului's stayed flat. Neither number reflects a wave of new homes coming onto the market, because until a wastewater plant in Waikapū is built, Central Maui has very little room for new market-rate houses. County officials don't expect that plant to open until 2029 or early 2030.

If you're comparing Wailuku and Kahului right now, that sets the terms of your decision. For the next few years, the houses you can choose from are mostly the houses already standing. When prices move, they move because of which of those homes come up for sale in a given month. A builder opening a new phase down the road won't be the reason.

Two Neighboring Towns, Opposite Years

Here is what the REALTORS® Association of Maui reported for single-family homes, year to date through August 2026, compared with the same stretch of 2025.

The single month of August 2026 fits the same pattern. Wailuku closed 9 single-family sales at a $949,000 median, compared with 9 sales at $995,000 in August 2025. Kahului closed 13 at $1,100,000, compared with 8 at $1,185,500 a year earlier.

Wailuku condos went the other way. Through August 2026 there were 49 condo sales at a $630,000 median, up 7.2% from $587,500 over the same period of 2025.

I haven't seen any source that explains why the two towns split, and I'm not going to invent a reason. Sample size is the honest place to start. Eighty-five sales spread over eight months is a small pool, and a few higher-end Wailuku Heights or Waikapū closings in 2025 that didn't repeat in 2026 could move a median that much. The two medians tell you about the mix of homes that sold. They don't tell you that a three-bedroom on a given Wailuku street is suddenly worth 13% less.

What's more useful is asking why the mix of homes changes year to year while total supply barely does. That comes down to infrastructure.

The Plant That Decides How Many Homes Central Maui Can Add

The planned Central Maui Wastewater Reclamation Facility will treat 4 million gallons a day on a 14.9-acre site of former farmland in Waikapū, between Honoapiʻilani and Kūihelani highways. It will serve Wailuku and Waikapū. In his March 2026 State of the County address, Mayor Richard Bissen said it would serve about 2,700 existing residences and roughly 2,000 new homes, and would "unlock additional housing capacity in Central Maui."

The county's FY2027 budget materials name the projects waiting on it. They include the 1,400-unit Waikapū Country Town, DHHL projects along Honoapiʻilani Highway, and developments along Waiʻale. The budget also says flows from Old Wailuku Heights and Kehalani could be redirected to the new plant to free up room in the existing Wailuku-Kahului system. Waikapū Country Town alone is planned at 1,433 homes, 500 of them affordable, with Waiʻale 905 Partners LLC as developer.

Here is the schedule as of the latest public statements:

1. Mid-2027. Department of Environmental Management Director Shayne Agawa said in January 2026, as reported by Maui Now, that the county was "on track to meet a bid opening roughly in mid of 2027."
2. About two years of construction after bids are awarded.
3. 2029 or early 2030. That's when Agawa said the plant could be operating.

The cost has moved too. The final environmental impact statement, published in February 2026, estimated $130.6 million. By April, DEM was forecasting $298 million to $420 million. Agawa said the earlier number was a 2022 conceptual estimate prepared "without geotechnical or survey information, without equipment quotes and before the August 2023 Maui wildfires." The FY2027 capital budget book lists $95 million for the project, and DEM's spending plan put $128 million toward it in FY2027. Those two figures measure different things, so don't combine them. The Council adopted the full FY2027 budget on June 5, 2026, and it took effect July 1.

The Waiʻale Road Extension is the other piece of Waikapū's growth plan, and its numbers have also climbed. A 2025 environmental assessment priced the 1.6-mile road from East Waiko Road to Honoapiʻilani Highway at $73 million and projected construction starting in late 2025. The mayor cited $80 million in March 2026, and the FY2027 capital budget lists $111.6 million for construction. I couldn't find a 2026 source confirming that work has actually begun.

What Is Getting Built in the Meantime

Construction is happening in Central Maui right now. Very little of it is a single-family home you could buy outright on the open market.

The Fairways homes show the trade-off clearly. They're four-bedroom houses priced well under the Kahului median. Maui Now reports that the buyer leases the land from the nonprofit on a renewable 99-year term, with land lease payments starting at $45 a month. That's a different kind of ownership from a fee simple resale, and the price reflects it.

Maui Lani has entitlements left for up to 1,900 more homes, according to the Central Maui community plan's housing resource paper. The paper doesn't name a market-rate phase scheduled to close in 2025 or 2026.

The Gap Between New Construction and Resale

The clearest market-rate new-construction comparison in Wailuku right now is Anuhea at Kehalani, developed by HBT of Anuhea LLC. A 1,529-square-foot Aheahe quick move-in home is currently listed at $1,512,000. That's an asking price on a live listing, not a closed sale. It still works as a reference point, at roughly $989 per square foot.

Builder costs explain a lot of that gap. Maui architects and builders reported in April 2026 that standard construction runs $375 to $550 per square foot. Land, site work, permits and utility hookups come on top of that. For a 1,529-square-foot house, that's about $573,000 to $841,000 for the structure alone, before the builder owns a lot or connects to anything. Statewide construction costs in Hawaiʻi rose 5.89% year over year in the first quarter of 2026, according to a Rider Levitt Bucknall report cited in the same coverage.

Put those numbers next to Wailuku's $1,040,000 YTD resale median and you get a buyer's way of reading 2026. A typical Wailuku resale is trading well below what a new market-rate home asks in the same master-planned community. Builders can't close that gap quickly, because the sewer capacity, road and construction costs that set new-build pricing are moving slowly or going up. When a resale median dips, it doesn't mean new supply is undercutting older homes. Not much new supply is coming yet.

A Cost That Applies to Every Owner

The same budget that funds the plant raised sewer bills. Starting July 1, 2026, the base charge for a single-family or duplex home on County water went from $51 to $61 a month, and the usage rate went from $4.60 to $4.75 per 1,000 gallons. The monthly maximum for a single-family home is now $103.75, up from $92.40, which comes to $1,245 a year at the cap. When I run carrying costs with Central Maui buyers, this belongs in the monthly budget next to insurance and association dues.

A Few Questions I'm Getting

Does Wailuku's lower median mean it's the better buy right now? The median dropped because a different mix of homes sold, in a fairly small number of sales. Compare specific homes and streets, and use recent closed sales that match the property you're looking at.

When will Waikapū Country Town homes be available? No firm sales schedule has been published. Its sewer service depends on the new plant, which officials expect to be operating in 2029 or early 2030. A 2025 estimate put full build-out around 2030 or 2031.

Is there a moratorium on new sewer connections in Wailuku or Kahului? I found no countywide cap or moratorium. The county budget does list rehabilitation work on Wailuku-Kahului sewer lines to meet capacity requirements.

If you're weighing a Kehalani resale against a new build, or a Kahului home against one in Wailuku, I'm happy to pull the recent closed sales for the streets you're considering and walk you through what they show. Reach out to Harry Devery and let's connect.

This article is general information, not legal, tax or financial advice. Consult a qualified professional about your situation.