Septic Installation & Cesspool Conversion in Kalapana, Kalapana Seaview & Black Sands

We install septic systems and convert cesspools in Kalapana, Kalapana Seaview and Black Sands, at the bottom of Highway 130 and roughly 40 minutes from our equipment yard in Keaau. This is the end of the road in a literal sense: the highway runs out on lava that buried the old village in 1990, and much of what has been built since sits on very young rock with almost no soil.

Kalapana in Brief

  • Small and spread out. The 2020 Census counted 167 residents in 68 households in the Kalapana CDP, which covers only about 1.5 square miles of this coast.
  • About 22 miles from Keaau. Highway 130 runs 21.6 miles from its junction with Highway 11 in Keaau to its south end near Kaimu. Highway 137 branches off 0.8 miles before the end.
  • Drier than upper Puna. The University of Hawaii Rainfall Atlas puts the Kalapana coast at roughly 80 to 90 inches a year, well under the 125 inches or so of Leilani Estates upslope.
  • Lava hazard zone 2. USGS lists Kalapana Sea View Estates, the Black Sand Beach subdivision, Kehena Beach Estates, Puna Beach Palisades, Kaimu-Makena Homesteads and what remains of Royal Gardens in zone 2, the areas just downslope of Kilauea’s active rift zones.
  • Not a DOH priority area. None of the five Hawaii Island priority areas in the 2017 DOH report covers this coast. The nearest, Kapoho, is up the coast past the 2018 flows.

Building on the 1990 Flow

Lava first entered Kalapana briefly in late 1986. Then, over about ten months beginning in 1990, flows from the Kupaianaha vent covered the village and the Kalapana Gardens subdivision. USGS says the flows destroyed more than 100 residences and left an average of about 33 feet of rock over the area. In early 1990, Kalapana Gardens had 120 homes on 739 lots; by 1991 it had none. Kaimu Bay and its black sand beach were filled in, and the state later set up the Kikala-Keokea homestead area about two miles from the old village to resettle displaced Native Hawaiian families.

People rebuilt anyway, on top of the new rock. Highway 130 now runs over the cooled flow near Kaimu, and homes sit on it. In 2010, lava came back and destroyed three homes, two of them built on the 1990 flows. By then Kalapana Gardens had grown back to about 35 structures.

That history is the reason septic design here looks different from Hilo or even Pahoa.

Thin Soil, Fresh Rock, and a Soil Replacement System

Two of the soil series NRCS uses for this coast were described right here. The type location for the Opihikao series is just off Highway 130 near Old Kalapana Road, and the Malama series was described in Royal Gardens west of Kalapana. Opihikao has about 2 to 10 inches of organic material and ash over pahoehoe. Malama has 2 to 12 inches over broken aa lava. Both drain fast at the surface and very slowly through the rock below.

On the 1990 and later flows, there is often no soil at all. Under HAR 11-62, fractured lava calls for a soil replacement system: the area under the leach field is excavated or built up and filled with suitable soil so effluent gets treated before it reaches the rock, with at least 3 feet of separation to groundwater. On this coast, that usually means:

  • Rock work. Breaking or ripping fresh pahoehoe to set a tank and dig a field bed.
  • Imported fill. All of it comes down Highway 130, so the haul is part of the price.
  • A careful look at groundwater. On low lots near the ocean, the engineer confirms the 3-foot separation before anything else.

Lava rock and near-shore sites push costs toward the upper end of the statewide $20,000 to $50,000 range. Our conversion cost guide explains what drives the number.

Small Lots and Shoreline Setbacks

Many lots in Kalapana Seaview and Black Sands are small. Recent listings in both subdivisions show lots of about 0.17 and 0.18 acre, which is roughly 7,400 to 7,800 square feet. HAR 11-62 normally requires 10,000 square feet of land per system, but lots recorded before August 30, 1991 are exempt from that minimum. If you’re not sure when your lot was recorded, the engineer will check the plat.

On a small lot, the tighter limits are usually physical: 5 feet from the house and property lines, 9 feet from the property line for a seepage pit, and 50 feet from the shoreline. On a compact coastal lot, fitting a tank and a soil replacement bed inside those lines is the first thing the engineer works out.

Typical Projects on the Kalapana Coast

What homeowners here usually need:

  • Owner-built homes on lava lots. New construction since 2016 needs an approved system, and DOH reviews it before the county building permit is signed off. Our new home septic guide covers that process.
  • Older homes on cesspools. Homes built before the 2016 ban may still have one, and the 2050 deadline applies.
  • Additions. Permitting an extra bedroom gives DOH grounds to ask for a new system.
  • Solar-powered homes. If your house runs on its own power, tell us. An aerobic treatment unit needs electricity around the clock and a service contract with inspections every six months, so a gravity septic tank with a soil replacement field is often the simpler fit when the site allows it.

Getting a Truck to the End of the Road

During the 2018 eruption, access to Kalapana was limited to residents until July 3, 2018. Inside the subdivisions, some roads are private and ownership is not always clear. In 2019, a proposed cell tower meant to serve Seaview and Black Sands was held up over whether its access road was state or private. If your lot is reached by an association road or a gated drive, tell us so we can plan for a loaded dump truck and an excavator.

Rules and Money for Kalapana Owners

  • 2050 deadline. Cesspools on this coast face the same January 1, 2050 cutoff as the rest of the state.
  • Sewer. Check with the county Department of Environmental Management; don’t assume service either way.
  • Funding. USDA Section 504 may help very-low-income rural owners, so check eligibility with the USDA office in Hilo. The state’s Act 204 loan fund is expected to open in late 2026. Our grants and loans page keeps the list current.

Up the Coast and Upslope

Tell Us About Your Kalapana Lot

Send us your street and subdivision, a rough idea of how much bare rock you have, and how you get to the lot. We’ll tell you what a system there is likely to involve. Request a free estimate

Frequently Asked Questions

Can I put a regular leach field on my Kalapana lava lot?

Usually not as-is. Fresh pahoehoe counts as fractured lava under HAR 11-62, so the field needs a soil replacement design with at least 3 feet of separation to groundwater.

My Seaview lot is under a quarter acre. Is that too small for septic?

Not necessarily. The 10,000 square foot minimum doesn’t apply to lots recorded before August 30, 1991. The real question is whether the tank and field fit inside the setbacks.

Does the 50-foot shoreline setback affect Black Sands lots?

It affects any lot where the leach field would be within 50 feet of the shoreline. On oceanfront lots, the engineer places the field toward the street side to keep that distance.

Is Kalapana in a cesspool priority area?

It isn’t one of the 2017 DOH priority areas. You can still look up your parcel on the UH Cesspool Prioritization Tool, and the 2050 deadline applies regardless.

Will an ATU work on an off-grid house?

It can, but it runs on power all the time and needs a maintenance contract. On solar, size your system for that load or ask the engineer about a gravity design instead.

Does lava zone 2 affect septic approval?

No. DOH reviews the system under the same rules as anywhere else. The zone matters more for insurance and lending.