How hard is the water in Hilton Head Island, SC?

Utility-reported hardness is unavailable in this index. Regional environmental samples cannot establish tap-water hardness. Ask your provider or test your tap.

Local water dashboard

Official source aggregation

Water quality in Hilton Head Island, SC 29928

Q: Is tap water safe in Hilton Head Island?

EPA SDWIS shows no active health-based violation in this profile's reporting window. That is not the same as proving every contaminant is absent, and federal data can lag state and utility records.

Regional hardness evidence, possible serving systems, EPA compliance history, and the measurements that are—and are not—available for Beaufort County.

Historical measurement record needs context

Largest possible serving system: Hilton Head Psd 1 (0720006)
Source water: Surface water + Groundwater
County: Beaufort County
Profile updated: Jun 29, 2026

Your tap water

What does the utility report?

Match the utility name to your water bill. These results describe the utility’s water, not a test at your home. A ZIP can include several water systems.

Utility hardness unavailable in this index

Nearby river or groundwater samples cannot tell us the hardness coming out of your tap. Ask your water provider for total hardness as CaCO₃, or test it at home.

Find an official utility report →

Convert a hardness result →Test your tap →

At a glance

What the current records say

EPA quarter 2026Q2

Utility-reported hardness

Unavailable

Ask your provider or test your tap

All possible systems

No active flag

0 active health-based records

Measurements by utility

Choose your provider

Each result belongs to a specific system.

Utility match

5 systems

Serves 25,558 people system-wide

Match the name on your water bill

Your utility’s measurements and compliance records

These are possible serving systems. A record for one system does not apply to every home in this ZIP. Confirm your provider before interpreting a measurement or notice. Federal records can lag current utility notices.

EPA snapshot: 2026Q2. Historical window begins Jan 1, 2021.

Hilton Head Psd 1 (0720006)

SC0720006 · Surface water · 25,558 people served system-wide

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

No active health-based record in this imported snapshot

Find this utility’s official report →

Measurements (1)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 0.001 mg/L
Action level: 0.015 mg/L

7% of the listed benchmark

Monitoring period: Jan 1, 2022 to Dec 31, 2024

Violation history (0)

No record returned in this imported window. This is not a guarantee of tap-water safety.

South Island Psd (sc0720001)

SC0720001 · Groundwater · 18,299 people served system-wide

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

No active health-based record in this imported snapshot

Find this utility’s official report →

Measurements (1)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 0.0021 mg/L
Action level: 0.015 mg/L

14% of the listed benchmark

Monitoring period: Jan 1, 2023 to Dec 31, 2025

Violation history (0)

No record returned in this imported window. This is not a guarantee of tap-water safety.

Water Oak Utility Co (sc0750002)

SC0750002 · Surface water · 2,318 people served system-wide

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

No active health-based record in this imported snapshot

Find this utility’s official report →

Measurements (2)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 0.0024 mg/L
Action level: 0.015 mg/L

16% of the listed benchmark

Monitoring period: Jan 1, 2021 to Dec 31, 2023

TTHM

EPA SDWIS reported health-based violation

Reported violation

Reported level: 0.083 MG/L
Maximum contaminant level: 0.08 MG/L

104% of the listed benchmark

Monitoring period: Jan 1, 2024 to Mar 31, 2024

Violation history (2)

Imported violation history for Water Oak Utility Co (sc0750002)
Rule	Status	Period
TTHMHealth-based	Resolved	Jan 1, 2024 to Mar 31, 2024
TTHMHealth-based	Resolved	Oct 1, 2023 to Dec 31, 2023

Daufuskie Isl Util-Haig Point (0750036)

SC0750036 · Groundwater · 608 people served system-wide

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

No active health-based record in this imported snapshot

Find this utility’s official report →

Measurements (1)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 7.1e-4 mg/L
Action level: 0.015 mg/L

5% of the listed benchmark

Monitoring period: Jan 1, 2023 to Dec 31, 2025

Violation history (2)

Imported violation history for Daufuskie Isl Util-Haig Point (0750036)
Rule	Status	Period
LEAD AND COPPER RULE REVISIONSHealth-based	Resolved	Oct 17, 2024 to Nov 27, 2024
LEAD AND COPPER RULE REVISIONS	Resolved	Oct 17, 2024 to Nov 27, 2024

Wells East S/d (sc0750026)

SC0750026 · Groundwater · 60 people served system-wide

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

No active health-based record in this imported snapshot

Find this utility’s official report →

Measurements (1)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 0.0044 mg/L
Action level: 0.015 mg/L

29% of the listed benchmark

Monitoring period: Jan 1, 2023 to Dec 31, 2025

Violation history (1)

Imported violation history for Wells East S/d (sc0750026)
Rule	Status	Period
Lead and Copper Rule	Resolved	Dec 30, 2025 to Feb 9, 2026

Hardness meter

What does nearby environmental evidence show?

Very Hard

1400

PPM as CaCO₃

Very Hard

PPM

1400

GPG

81.9

Regional environmental evidence

USGS hardness classification scale

1400 PPM

Soft
0–60Moderate
61–120Hard
121–180Very hard
181+

Parts per million

1400

mg/L as CaCO₃ equivalent

Grains per gallon

81.9

1 GPG ≈ 17.1 PPM

How to use regional evidence

These samples describe nearby environmental water. They cannot establish whether your tap water is soft or hard. Use a utility result or a tap test for appliance settings and treatment sizing.

USGS sites used

Nearest site

23.5 mi

Observation range

Dec 3, 2024–Dec 3, 2024

Regional evidence confidence

Low

Median of the latest source-type-aligned hardness observation at each monitoring site within 25 miles. Nearest monitoring location: SAVANNAH RIVER AT GA 25, AT PORT WENTWORTH, GA (Tidal stream).USGS source documentation ↗Evidence tier: Regional environmental evidence. This value is not used as proof of the serving utility's treated-water hardness.

Regional context

Is 29928 typical?

These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.

Hilton Head Island median

1400 PPM

About the same

1 indexed ZIP readings · Range 1400–1400 PPM

South Carolina median

27 PPM

1373 PPM higher

134 indexed ZIP readings · Range 3–1400 PPM

Evidence-first next steps

Confirm the problem before choosing treatment

This profile can help you ask the right question. It cannot select equipment for a property without a current result from the serving utility or the tap.

Confirm the serving system

ZIP boundaries and utility service areas do not perfectly match. Verify the system on a water bill before relying on system-wide records.

Read the current utility report

Use the current Consumer Confidence Report for treated-water results and official notices.

Find an official utility report →

Test for the decision you face

Use a tap hardness test before sizing a softener. For health concerns, use a certified laboratory and the correct sampling protocol.

Convert your hardness test result →

Nearby indexed reports

More local profiles in Hilton Head Island

Estimates can differ across a city because monitoring locations and associated systems differ.

View all Hilton Head Island reports →

ZIP 29926

Regional context

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Frequently asked

Water questions for Hilton Head Island

Is tap water safe in Hilton Head Island?+

EPA ECHO shows no active health-based violation for the associated systems in this reporting snapshot. This does not prove every contaminant is absent; federal records can lag and household plumbing can change tap conditions.

How hard is the water?+

Utility-reported hardness is unavailable in this index. Regional samples do not establish tap-water hardness. Ask your provider or test your tap.

Do I need a water softener?+

Confirm hardness at your tap and consider actual scale or spotting before choosing treatment. Regional environmental values cannot determine whether you need a softener. A softener addresses hardness, not every contaminant.