Off-grid living in Hawaiʻi: a property guide
A private toilet, well or catchment tank is never the whole property decision. Hawaiʻi separates wastewater approval, groundwater development, water-use reporting, county land use and building permission.
A four-desk property sequence
No single “off-grid permit” exists.
County
Confirm zoning, dwelling type, grading, flood/coastal controls, building permits and occupancy.
Health
Have a Hawaiʻi-licensed civil engineer develop the individual wastewater application.
Water
Resolve well construction, pump installation, groundwater use and reporting with CWRM.
Property
Check title, access, utilities, agricultural conditions, association rules and site hazards.
Individual wastewater
The engineer is the first call, not the installer.
DOH directs owners proposing an individual wastewater system to retain a Hawaiʻi-licensed civil engineer. The engineer evaluates the site, designs the system and prepares the application under HAR Chapter 11-62. An approval can lapse when the related county building permit or system construction does not move within the rule’s time limits.
Composting / incinerating toilets
The toilet is not the wastewater system.
DOH explains that these devices address toilet waste only. Shower, lavatory, kitchen and laundry flows still require an approved treatment and disposal method. A product claim or local installation does not answer the rest of the household water stream.
Groundwater is administered
Drilling is not merely a construction purchase.
The Commission on Water Resource Management administers well-construction and pump-installation permits and groundwater-use controls. Owners of wells and stream diversions have reporting duties. Designated water-management areas can add a water-use permit question; the exact aquifer, use and current commission requirements matter.
Existing-property warning
A cesspool is a liability file, not an inherited approval.
Hawaiʻi’s statewide cesspool conversion program and wastewater rules make the existing disposal method a material purchase question. Identify the system type rather than accepting “septic” as a generic label, locate it, obtain DOH records, determine the applicable conversion obligations and test whether a replacement design fits the parcel.
Island-specific due diligence
Lava zones, catchment practices, cesspools, agricultural zoning and county code administration require parcel-level review.
Water-management areas, fire exposure, coastal constraints and post-disaster rule changes can shape the approval path.
Public-service proximity, dense land-use controls, groundwater protection and city-county permits are central.
Rain, flood, slope, access, wastewater fit and county planning must be resolved together.
These are investigation prompts, not island-wide legal conclusions. Verify the tax-map key, county, state districts, utility service and recorded title conditions for the actual parcel.
Hawaiʻi buyer file
Trace every water stream.
- county zoning and dwelling classification
- TMK, title, access and private covenants
- DOH wastewater type and approval
- engineered replacement feasibility
- CWRM well, pump and use records
- potable source and laboratory evidence
- flood, coast, lava, slope and wildfire
- county building and occupancy sequence
Evidence ledger
Official Hawaiʻi sources
Reviewed September 26, 2026. Statewide sources establish key approval systems; county and parcel facts decide land use, construction, service and site feasibility.
- HI1Individual Wastewater Systems
Hawaiʻi Department of Health · Engineer-led IWS application and alternative-toilet boundaries
- HI2Wastewater rules
Hawaiʻi Department of Health · HAR Chapter 11-62, approval duration and system definitions
- HI3Wastewater Branch
Hawaiʻi Department of Health · Cesspool conversion and statewide wastewater resources
- HI4Water Resource Forms
Commission on Water Resource Management · Well construction, pump installation and water-use forms
- HI5Ground Water Regulation
Commission on Water Resource Management · Well development and groundwater-use framework
- HI6Water Use Reporting
Commission on Water Resource Management · Monthly reporting for wells and stream diversions
- HI7County building-code links
Hawaiʻi Department of Accounting and General Services · State and county construction-code resources