Hilton Head Island Water Hardness & Quality Report (2026)
Water Hardness
8.7 grains per gallon
Source
reservoir
pH Level
8.1
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
389.9 mg/L
Est. Daily Cost
$0.40
energy & soap waste
Source: USGS Water Quality Portal · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Hilton Head Island, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Hilton Head Island | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.7 yrs | 8.5 yrs | -45% |
| Washing Machine | 8.1 yrs | 12 yrs | -33% |
| Water Heater | 9.7 yrs | 15 yrs | -35% |
Regional Water Comparison
How Hilton Head Island compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Hilton Head Island, South Carolina | 148.5 mg/L | 8.2 ppt | 🟠 Hard | reservoir |
| Hilton Head, South Carolina | 148.5 mg/L | 8.2 ppt | 🟠 Hard | reservoir |
| Bluffton, South Carolina | 58.5 mg/L | 3.3 ppt | 🟢 Soft | reservoir |
| Beaufort, South Carolina | 102 mg/L | 5.6 ppt | 🟡 Moderately Hard | reservoir |
| Wilmington Island, Georgia | 86.5 mg/L | 4.2 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Hilton Head Island compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Hilton Head Island | 148.5 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
Bring Badger-quality water to your Hilton Head Island home
Shop water softeners on Amazon.com →
What Makes Hilton Head Island's Water Unique?
Local geology and source profile
Hilton Head Island, South Carolina, in Beaufort County — one of the most iconic resort destinations in the Eastern United States, a world-class golf and beach community (Harbour Town Golf Links — host of the PGA Tour's RBC Heritage tournament), the Sea Pines Resort, a major Gullah-Geechee heritage community (Hilton Head Island has a historic Gullah-Geechee African-American community descended from enslaved African people who maintained distinctive cultural traditions), and a major southeastern US luxury resort and retirement destination — draws its municipal water supply from the Floridan Aquifer System via the Beaufort-Jasper Water and Sewer Authority (BJWSA). Water hardness in Hilton Head Island measures 148.5 mg/L — classified as moderately hard.
Hilton Head's moderate hardness reflects the Beaufort County sea island Floridan Aquifer characteristics with moderate BJWSA treatment. The Floridan Aquifer at Hilton Head Island–Beaufort County is hosted in: the Eocene Ocala Limestone (calcareous marine limestone of the southeastern US Coastal Plain — moderately calcareous on the South Carolina sea islands); the Hawthorn Group (calcareous phosphatic limestone and dolostone confining/producing layers). BJWSA applies moderate treatment to the Floridan Aquifer supply, producing the moderate 148.5 mg/L.
At 148.5 mg/L, Hilton Head Island residents encounter moderate-to-hard scale accumulation. Monthly cleaning with citric acid solution is recommended. BJWSA consistently delivers water meeting all South Carolina DHEC and EPA Safe Drinking Water Act requirements.
Geology & Source: Groundwater from the Floridan Aquifer System (Upper Floridan and Surficial Aquifer) via the Beaufort–Jasper Water and Sewer Authority (BJWSA) — the Beaufort County south South Carolina sea island (Eocene Ocala Limestone and Hawthorn Group calcareous formations; moderate BJWSA treatment); moderately hard supply at 148.5 mg/L in Beaufort County.