The Hidden Cost of Hawaii Cesspool Upgrades: Lessons from WaiHome

A wastewater upgrade can look straightforward on paper and become expensive the moment a contractor studies the property. In Hawaii, hard rock, slopes, tight lots and coastal conditions can turn a conventional tank installation into a difficult project. For excavation and septic contractors, the important question is not simply which equipment costs less. It is which permitted approach fits the site and what the entire job will require.

Greg Wong, co-founder of WaiHome alongside James Roberts, joins Scott Andreasen on the Excavation & Septic Profits Podcast to discuss that challenge. Their company develops above-ground wastewater technology for Hawaiian conditions. The conversation explores Mata, a solid waste interceptor, and the practical business decisions behind bringing a different primary-treatment approach to a conservative, regulated industry.

Why the site can cost more than the tank

Wong describes homeowners facing upgrade bills of roughly $30,000 to $50,000 in the interview. Those figures are his estimates, not a universal price range or a current project quote. His larger point is useful: buying the tank is only part of the expense. Excavation, labor, access and difficult ground can dominate the installed cost, especially where equipment cannot work as efficiently as it would on an open mainland property.

The company's response was to ask whether primary treatment could move above ground. For contractors, that creates a reason to compare complete designs rather than appliance prices alone. A higher-priced component might reduce one part of a job while leaving other work unchanged. Explaining those tradeoffs clearly helps homeowners understand both the potential value and the costs that an alternative system does not remove.

What Mata does, and what it does not do

A conventional septic tank separates solids and liquids largely through settling. Wong describes Mata as using a screen and auger to mechanically remove solids from the wastewater stream. Captured solids are heat treated and dehydrated, while the liquid is routed onward. The product focuses on primary treatment rather than trying to perform every stage of wastewater treatment inside one appliance.

That distinction matters. Mata is an above-ground solid waste interceptor, not a universal complete replacement for septic treatment and disposal. Liquid still needs a suitable, locally permitted disposal arrangement, and some sites may require additional treatment. An existing cesspool cannot simply be assumed ready for reuse. WaiHome's published guidance describes structural lining and a successful infiltration test when converting a cesspool to a seepage pit.

WaiHome describes appliance installation without excavation on suitable sites, but that does not make every conversion an excavation-free project. A base or slab, plumbing changes and liquid-disposal work can still affect scope and cost. Contractors should separate the appliance installation from the full permitted project when estimating or discussing savings. The interview does not establish guaranteed savings for any particular homeowner.

Raised foundations and ongoing service change the conversation

At the time of the interview, Wong says WaiHome was concentrating on raised-foundation homes so gravity could carry wastewater into the above-ground unit. He describes roughly 12 to 14 inches of elevation as relevant to that initial approach. This is interview context, not a substitute for reviewing actual plumbing elevations, the property layout and current manufacturer requirements. Slab-on-grade homes should not be presented as automatically suitable.

Maintenance also belongs in the initial sales conversation. Wong explains that a homeowner or service provider removes the dried solids. His examples range from about one to two months for a small household to one to two weeks for five or six occupants. Those intervals depend on household use and the system's capacity. Contractors should clarify who performs the work, how access is maintained and what ongoing service will cost.

Wong discusses a $7,500 unit price and service around $100 per month, with important qualifications for location and frequency. Those are interview-era examples, not current offers or complete installed prices. Solids handling also remains regulated. Wong distinguishes dried material from fully sterilized material, so disposal or reuse should follow applicable rules and manufacturer guidance rather than assumptions that the output is unrestricted fertilizer.

Certification is part of the work, not a universal permission slip

Wong describes pursuing IAPMO Z1167 certification for Mata's solid-separation role. He also emphasizes the quality-control processes needed to manufacture consistently. That is a different claim from certifying a complete system to every wastewater treatment standard. His discussion of NSF standards concerns other treatment technologies and should not be transferred to Mata as an expanded certification claim.

For excavation and septic contractors evaluating unfamiliar equipment, the practical lesson is to check the product's documented listing, the design requirements and the local permitting path. A product listing does not replace site approval. WaiHome's Hawaii permitting claims should not be read as permission to install the same configuration anywhere on the mainland. Start with the property and the jurisdiction, then determine whether the equipment belongs in the design.

Build the business around a focused problem

WaiHome did not begin with Mata as its first concept. Wong says the team initially considered an above-ground aerobic treatment unit, then shifted toward primary treatment after recognizing that other companies already offered secondary-treatment options. For a contractor, the business lesson is to identify the expensive or underserved part of a customer's problem rather than assume that offering more services always creates more value.

Funding and team structure helped make that focus possible. Wong credits grants, including support from the National Science Foundation and NOAA, with providing runway for development, certification and the long path to sales. That is his account of WaiHome's experience, not a promise that another startup will qualify. He also describes complementary responsibilities: manufacturing and product development on his side, wastewater expertise and sales on Roberts' side, with regular communication between them.

Their approach to growth is equally deliberate. Wong describes prioritizing Hawaii and limiting expansion until the team can support it. Licensing or working with a larger manufacturer appears in the conversation as a future possibility, not a completed agreement. The takeaway is practical: demand is only useful if a company can deliver, maintain quality and support customers without stretching its operations beyond their capacity.

Make your expertise easier for customers to understand

The conversation gives contractors practical questions to ask about site costs, treatment boundaries, maintenance and business focus. To learn whether Mata fits a particular property, visit WaiHome, call 808-970-7245 or email info@waihome.com. Confirm current availability, specifications and local requirements directly.

If your excavation or septic business needs a clearer way to communicate its services and reach the right customers, schedule a conversation with Excavation Marketing Pros. Send us a message today to find out how Excavation Marketing Pros can help you explain your expertise and build a stronger marketing foundation.