Water quality · ZIP 29928
Water quality in Hilton Head Island, SC
ZIP 29928 (South Carolina) — water quality summary sourced from EPA SDWIS. Refreshed on the cadence of the primary regulator with every claim cited to the source record.
What lands here
Pages show the CWS serving the address, any health-based violations in the last 3 years, most recent lead and copper sampling result, and a link to the primary SDWIS record.
Source & refresh
EPA SDWIS. Refreshed quarterly (federal mandate). Stale data is flagged, never silently served. Primary source →
Limitations specific to this source
Where a ZIP is served by multiple water systems, zipradar shows the dominant CWS by population served and lists alternates. Private well water is not covered.
South Carolina context
Hurricanes (coastal), inland flood
South Carolina's coastline (Hilton Head, Charleston, Myrtle Beach) carries dense FEMA VE/AE zones. Inland AE zones along the Pee Dee, Santee, Saluda rivers. EPA SDWIS small-system compliance variability.
See South Carolina state page for the full state-level rollup across all 12 dimensions.
Read more on water quality
Editorial deep-dives explaining the source data, its limits, and how to read it.
Flood zones explained — what AE, X, and VE actually mean
Plain-English guide to FEMA flood-zone codes (A, AE, AH, V, VE, X, X-shaded). What the 1% and 0.2% annual-chance zones mean for your property and your insurance.
EPA Radon Zones — what 1, 2, and 3 mean and when you should test
EPA classifies every US county into Zone 1 (high), Zone 2 (moderate), or Zone 3 (low) for radon. Plain-English guide to the classifications and at-home testing.
EPA AQI categories explained — what 0–50 Good through 301–500 Hazardous mean
Plain-English guide to the six EPA Air Quality Index categories: 0–50 Good, 51–100 Moderate, 101–150 Unhealthy for Sensitive Groups, 151–200 Unhealthy, 201–300 Very Unhealthy, 301–500 Hazardous — what each level means and who is at risk.
Lead and Copper Rule 2024 — the federal lead-pipe inventory mandate
The 2024 Lead and Copper Rule Revisions (LCRR) require every US community water system to inventory and report lead service lines. Plain-English guide.
Full dashboard for ZIP 29928
Water quality is one of twelve dimensions zipradar federates per address. See the full federated summary for ZIP 29928:
Open Hilton Head Island, SC dashboard →Frequently asked questions
What is the water quality for ZIP 29928?
Water quality for ZIP 29928 (Hilton Head Island, South Carolina) is federated from EPA SDWIS. Pages show the CWS serving the address, any health-based violations in the last 3 years, most recent lead and copper sampling result, and a link to the primary SDWIS record. Refreshed quarterly (federal mandate) — see /methodology for full source citations and refresh-cadence details.
Where does the water quality data come from?
EPA SDWIS (primary regulator). zipradar federates water quality on the regulator's published cadence: quarterly (federal mandate). Every claim cites the source record; stale data is flagged, never silently served. The primary source URL: https://www.epa.gov/ground-water-and-drinking-water/safe-drinking-water-information-system-sdwis-federal-reporting.
What are the limitations of water quality data?
Where a ZIP is served by multiple water systems, zipradar shows the dominant CWS by population served and lists alternates. Private well water is not covered.
Is ZIP 29928 (Hilton Head Island) data current?
Last verified 2026-06-03. Water quality for ZIP 29928 refreshes quarterly (federal mandate) per EPA SDWIS cadence. See the full ZIP dashboard at /zip/29928/ for all 12 dimensions side-by-side.