Hampton Roads has the fastest relative sea-level rise on the U.S. Atlantic coast — 4.84 mm a year at Sewells Point — because the land is sinking as the water climbs. We read the federal record, subsidence included, for any address on it.
Every figure below is drawn from a public NOAA, USGS or FEMA source and stamped with it — no estimates, no proprietary model.
Because the sea is rising and the land is sinking at the same time — subsidence accounts for more than half of the relative rise around Hampton Roads.
NOAA's Sewells Point gauge in Norfolk (station 8638610) records a relative sea-level trend of 4.84 ± 0.21 mm/yr over 1927–2024 — about 1.59 feet per century. USGS Circular 1392 (Eggleston and Pope, 2013) shows the southern Chesapeake region has been subsiding 1.1–4.8 mm/yr since the 1940s, driven mostly by groundwater pumping that compacts the deep aquifer, with glacial isostatic adjustment adding more. Land going down and water coming up is why the region ranks among the most sea-level-vulnerable in the nation.
NOAA Tides & Currents (8638610); USGS Circular 1392, Eggleston and Pope (2013).The bay's low, fetch-exposed shores erode steadily, and its small islands are vanishing — the Tangier Islands have lost two-thirds of their land since 1850.
Unlike an open-ocean beach, most of Virginia's tidal shoreline is marsh, bank and low island that erodes under wind-waves and rising water rather than surf. The clearest signal is Tangier: a 2015 study using USGS mapping software found 66.75% of the Tangier Islands' landmass lost between 1850 and 2013, with the town projected to need abandonment within 50 years under a mid-range sea-level scenario — as little as 25 under the high scenario. The same forces thin marshes and undercut banks all along the bay.
Schulte, Dridge & Hudgins (2015), Scientific Reports, "Climate Change and the Evolution and Fate of the Tangier Islands."Virginia Beach's resort strip is held by a seawall and continuous nourishment, while the barrier islands of the Eastern Shore migrate freely.
The City of Virginia Beach oceanfront is one of the most heavily engineered stretches in the mid-Atlantic, defended by a seawall, dune and recurring beach-fill program. North of it, the undeveloped barrier islands of Virginia's Eastern Shore are among the most rapidly changing on the East Coast, rolling landward with the rising sea. The contrast is the same one that runs through this whole coast: where sand is paid for, the line holds; where it isn't, it moves.
USACE / City of Virginia Beach Hurricane Protection and beach-nourishment program; USGS barrier-island studies.Low-lying Norfolk, Hampton and Virginia Beach are largely in AE zones with pockets of VE along the ocean and bay fronts, and recurrent high-tide flooding is already routine.
Across Hampton Roads, large areas sit near or below the base flood elevation, and "sunny-day" tidal flooding now closes streets on calm days. Whether a parcel is AE, VE or X — and how its grade compares to the base flood elevation — sets flood-insurance cost, lender requirements and elevation rules. We read the current FEMA National Flood Hazard Layer at the exact coordinate.
FEMA National Flood Hazard Layer; NOAA high-tide-flooding records, Sewells Point.Enter the address and Psammite assembles a Certificate of Coastal Impact for $99 — the NOAA, USGS and FEMA record for that exact parcel, in one screening.
Published rates are regional, so no table gives a per-parcel number. Our method takes the point, applies the Sewells Point relative sea-level trend and the regional subsidence range, reads the FEMA zone and base flood elevation, and compares tidal- and surge-flood exposure to the parcel's grade — every figure sourced. It is a screening assessment, not a survey, and it is the packet a coastal engineer would otherwise rebuild by hand.
Psammite Certificate of Coastal Impact — NOAA Tides & Currents, USGS Circular 1392, FEMA NFHL.Records © USGS / NOAA / FEMA, public domain. Screening only — confirm present conditions with a recent survey or field inspection.
The $99 Certificate of Coastal Impact reads the full federal record for your parcel in a single screening.