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City water profile

Hilton Head Island water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Hilton Head Island, South Carolina.

Median indexed hardness

27PPM

2 indexed ZIPs

Range 27–27.7 PPM

State comparison
8 PPM above
State hardness rank
#50 of 173
Matched utilities
5
Active health records
0

City summary

What the indexed records say

Hilton Head Island has 2 published ZIP profiles across Beaufort County. The indexed median is 27 PPM, compared with 19 PPM across South Carolina.

Among the 173 South Carolinacities with an indexed median, Hilton Head Island ranks #50from highest to lowest. Across all 236 state ZIP profiles, available estimates run from 4.2to 106 PPM.

The 27–27.7 PPM range shows how much the available ZIP estimates vary within the city label. At least one estimate is marked low confidence, so observation distance and date deserve extra attention.

Hardness distribution

How local ZIP estimates compare

Soft2 ZIPs
Moderately hard0 ZIPs
Hard0 ZIPs
Very hard0 ZIPs

2 of 2 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
25.1 miles
Profiles with evidence
2/2

Confidence labels

High: 0Moderate: 1Low: 1

Observation window: Jan 6, 2016 to May 14, 2026.

ZIP directory

Water reports in Hilton Head Island

Open a ZIP for site-level provenance and measurements.

ZIP code

29926

Soft

27 PPM

Nearest site
25.1 mi
Confidence
Low

View full ZIP evidence →

ZIP code

29928

Soft

27.7 PPM

Nearest site
23.5 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Hilton Head Psd 1 (0720006)

PWSID SC0720006

Surface water
System population served
25,558
Last reported
Jun 29, 2026

The system names this served city; Census place overlap links the city to this ZCTA.

South Island Psd (sc0720001)

PWSID SC0720001

Groundwater
System population served
18,299
Last reported
Jun 29, 2026

The system names this served city; Census place overlap links the city to this ZCTA.

Water Oak Utility Co (sc0750002)

PWSID SC0750002

Surface water
System population served
2,318
Last reported
Jun 29, 2026

The system names this served city; Census place overlap links the city to this ZCTA.

Daufuskie Isl Util-Haig Point (0750036)

PWSID SC0750036

Groundwater
System population served
608
Last reported
Jun 29, 2026

The system names this served city; Census place overlap links the city to this ZCTA.

Wells East S/d (sc0750026)

PWSID SC0750026

Groundwater
System population served
60
Last reported
Jun 29, 2026

The system names this served city; Census place overlap links the city to this ZCTA.

Compliance history

What EPA records show

No active health-based violation appears among the associated systems in the represented EPA reporting quarter. This does not mean every contaminant was tested at every tap.

RecordSystemPeriodStatus
Lead and Copper RuleSC0750026Dec 30, 2025Resolved
LEAD AND COPPER RULE REVISIONSSC0750036Oct 17, 2024Resolved · health-based
LEAD AND COPPER RULE REVISIONSSC0750036Oct 17, 2024Resolved
TTHMSC0750002Jan 1, 2024Resolved · health-based
TTHMSC0750002Oct 1, 2023Resolved · health-based

Practical next steps

Move from index to evidence

  1. 1. Open your ZIP. Check distance, dates, confidence, and the associated utility.
  2. 2. Read the current CCR. Confirm source water, detections, limits, ranges, and notices.
  3. 3. Test the tap when needed. Confirm health concerns or treatment sizing with the right method.

Questions people ask

About water in Hilton Head Island

Is the water hard?

The indexed city median is 27 PPM. Open the ZIP report to verify the distance and confidence behind that estimate.

Is the tap water safe?

Compliance history is utility-wide and cannot guarantee conditions at every tap. Check current notices and test when address-specific evidence is needed.

Do I need treatment?

Choose treatment only after confirming the problem at the property. A softener targets hardness; contaminant treatment requires a matching, verified performance claim.