Buying a Maui Home With a Cesspool, What the 2050 Law Means for You

Yes, you can buy a Maui home with a cesspool, and plenty of people do. Hawaii does not require the system to be replaced when the house sells. What it does require is that every cesspool in the state be converted by 2050, and that obligation goes with the property to the new owner. So the real question is not whether to buy one. It is how much the upgrade will cost, when you will need to do it, and whether the price already reflects that.

I live in Paia, and on the North Shore and Upcountry this comes up constantly. Much of Haiku, Kula, and Makawao sits outside the county sewer system, so older homes there were built on cesspools as a matter of course. Here is what you need to know before you write an offer on one.

What is a cesspool, and why is Hawaii phasing them out?

A cesspool is an underground pit that collects household wastewater and lets it soak straight into the ground with little or no treatment. A septic system, by contrast, holds the waste in a tank where solids settle out, then sends the liquid through a leach field that filters it through the soil.

Hawaii has more cesspools per person than any other state, somewhere around 83,000 to 88,000 depending on whose count you use, and more than 12,000 of them are on Maui. Together they release tens of millions of gallons of untreated wastewater into the ground every day. On an island this size, that water reaches drinking water wells, streams, and the reef. That is the reason for the law.

What does the 2050 law actually require?

Act 125, signed in 2017, requires every cesspool in Hawaii to be upgraded to an approved wastewater system, converted, or connected to a sewer by January 1, 2050.

A few details matter for buyers.

• New cesspools have been banned since 2016. Anything built since then should already have septic, an aerobic unit, or sewer.
• Not every cesspool is on the same clock. The Department of Health ranks cesspools by the risk they pose, and the ones closest to drinking water sources, streams, and shoreline are the highest priority. Those are the most likely to face earlier requirements or targeted funding.
• There is no statewide point-of-sale rule right now. Bills that would force conversion when a home sells have come up at the legislature several times and none has become law as of this writing. Watch this one, because it could change how cesspool homes are priced overnight.

You can look up the priority level for a specific area with the University of Hawaii Sea Grant cesspool prioritization tool.

How do I find out if a Maui home has a cesspool?

Start with the seller's disclosure statement. Hawaii sellers have to disclose the property's wastewater system, and a cesspool should be called out there. Then confirm it three ways.

1. Ask your agent to check the listing and the county records. The MLS listing often notes sewer, septic, or cesspool.
2. Ask the Department of Health's Wastewater Branch whether there is an approved individual wastewater system on file for the parcel. If there is no record of a septic permit on an older home, assume cesspool until proven otherwise.
3. Have it inspected. A wastewater contractor can locate the system, check its condition, and tell you whether it is one pit or several.

How much does a cesspool conversion cost on Maui?

For a typical single-family home, plan on roughly $20,000 to $50,000, and more on a hard site. Here is what drives the number.

Assistance programs come and go. The state has offered income-based grants and, in past years, a tax credit, and the legislature has been working on loan programs. Check what is open when you are ready, but do not count on it in your budget.

Will a cesspool lower the price of a home?

It should factor in. A well-informed buyer compares a cesspool home against similar homes that already have septic and adjusts for the difference. In practice, how much it moves the price depends on the market. In a tight neighborhood with little inventory it may barely show up. On a home that has been sitting, it becomes a clear point of negotiation.

My advice. Get a contractor's estimate during your inspection period. A real number turns the cesspool from a vague worry into something specific you can negotiate with, whether that is a price reduction, a seller credit, or a clear decision to walk away.

What else should I know before buying a cesspool home?

Your renovation plans. If you want to add bedrooms, build an ohana, or do a major remodel, expect the Department of Health to review the wastewater system as part of the permit. A cesspool generally will not pass that review, so the conversion becomes part of your project cost. Know this before you buy a property for its expansion potential.

Your lender and insurer. Most lenders will still finance a cesspool home, but some ask more questions than others. Mention it early so nothing surprises you in underwriting.

When you sell. You can pass the obligation on to the next buyer, but the closer we get to 2050, the more buyers will expect it to be done. Converting on your own schedule usually costs less than converting under pressure.

The short version

A cesspool is not a reason to pass on the right North Shore or Upcountry home. It is a known cost with a known deadline. Confirm the system, get a real estimate before you remove your contingencies, and make sure the price reflects the work. For more on the other things off-island buyers tend to miss, read the property types I tell buyers to look at twice, and if you are comparing areas, start with my guides to Kula, Makawao, and Paia, Kuau and Spreckelsville.

I am a REALTOR, not an engineer or an attorney. Rules and assistance programs change, so confirm current requirements with the Hawaii Department of Health Wastewater Branch and a licensed wastewater contractor before you rely on them.