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What every buyer, builder, and realtor should screen for before closing on a Hawaii parcel — flood zones, soils, wetlands, slope, and the regulatory specifics that catch out-of-state buyers.
Get a federal-data screening report on any Hawaii address: SitePrior — $29 →
Microclimates ranging from rainforest to desert within miles, lava-flow hazard zones (Big Island), tsunami inundation, and very high orographic rainfall extremes.
Orographic rainfall extremes — windward sides can receive 100+ inches/year; lee sides under 20. Tropical cyclones, lava-flow hazards (Big Island), and tsunami inundation zones add unusual due-diligence layers.
NOAA Atlas 14: NOAA Atlas 14 Volume 4 (Hawaiian Islands). Site-specific design rainfall (2-, 10-, 25-, 100-year, 5-min through 60-day durations) is included in every full SitePrior report for Hawaii parcels.
Volcanic soils — young basaltic flows with rapid infiltration; older weathered laterites with very slow drainage. Lava-tube voids beneath some properties.
USDA SSURGO mapping is available for almost every Hawaii parcel and is the basis for the soil section in your SitePrior report — including hydrologic soil group (A–D), drainage class, depth to water table, and septic suitability where USDA has rated it.
None of these are deal-breakers on their own, but each one can add tens to hundreds of thousands of dollars to a build — or kill a permit application — if it isn't identified before closing. A SitePrior report flags which of these apply to your specific parcel from federal data sources; a state-licensed engineer in Hawaii designs around them.
FEMA's effective NFHL panels cover essentially all of Hawaii, with flood-zone designations (X, A, AE, AO, V, VE) tied to specific FIRM panels. Properties in X (unshaded) are outside the 500-year floodplain and don't trigger federal flood-insurance requirements. A and AE zones are inside the 100-year floodplain and require flood insurance with a federally backed mortgage; AE includes a Base Flood Elevation that the finished floor must meet. V and VE are coastal high-hazard zones (wave action expected) requiring elevated construction.
SitePrior's report pulls the effective NFHL panel for your address and reports the zone and BFE. The interpretation paragraph explains what it means for insurance, lender requirements, and finished-floor design — written for a buyer, not for a permit reviewer.
Permit-grade engineering work in Hawaii requires a stamped report from a state-licensed engineer. The state also has its own rules on dam safety, wetland setbacks, stormwater management, and (in many cases) shoreline or steep-slope overlays beyond what FEMA and the USACE require. SitePrior tells you when those overlays might apply to your parcel; a state-licensed engineer in Hawaii confirms and designs to them.
SitePrior reports are screening documents, not engineering opinions of record. For permits, stamped designs, formal flood-zone amendments (LOMAs), or any work that has to be sealed by a licensed engineer in Hawaii, you need someone holding an active state license. The fastest verifiable directories are run by the licensing board itself and the national engineering societies — not by lead-gen aggregators.
Verify any engineer's active license and find the official board roster:
NCEES board directory →NSPE state societies often run a "find an engineer" tool by discipline and county:
NSPE state societies →If your parcel has a dam, levee, or impoundment, contact the state dam-safety office through ASDSO:
ASDSO state directory →Section 404 wetland jurisdiction questions are handled by the U.S. Army Corps district covering your county:
USACE district map →We don't take referral fees from any of the directories above — these are the authoritative federal and professional-society sources. SitePrior is not affiliated with NCEES, NSPE, ASDSO, or USACE.
Federal data, plain-English interpretation, $29. Drops in your inbox in under 90 seconds.