How does Port Royal's water compare to the national average?

The USA national average is 151 mg/L. Port Royal (≈ 0–59 mg/L) is 121 mg/L softer than average.

Port Royal Water Hardness & Quality Report (2026)

Water Hardness

soft

~0–59 mg/L

Soft

estimated · not lab-verified

Source

reservoir

pH Level

neutral = 7.0

Lead

0.008 mg/L

✓ Below action level

TDS

348.3 mg/L

Est. Daily Cost

$0.08

energy & soap waste

Source: See methodology section below · Updated 2026

soft~0–59 mg/LSoft · est.

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 Port Royal, your appliances are currently losing 4% efficiency due to mineral buildup.

Appliance	In Port Royal	Soft Water City	Efficiency Loss
Kettle	8.2 yrs	8.5 yrs	-4%
Washing Machine	11.5 yrs	12 yrs	-4%
Water Heater	14.4 yrs	15 yrs	-4%

Regional Water Comparison

How Port Royal compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Port Royal, South Carolina	≈ 0–59 mg/L	7.7 ppt	🟢 Soft	reservoir
Beaufort, South Carolina	≈ 0–60 mg/L	5.6 ppt	🟢 Soft	groundwater
Hilton Head, South Carolina	≈ 120–179 mg/L	8.2 ppt	🟠 Hard	reservoir
Hilton Head Island, South Carolina	≈ 120–179 mg/L	46.8 ppt	🟠 Hard	reservoir
Bluffton, South Carolina	≈ 0–60 mg/L	3.3 ppt	🟢 Soft	groundwater

National Benchmark

How Port Royal compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Port Royal	≈ 0–59 mg/L	🟢 None
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

Bring Scarsdale-quality water to your Port Royal home

Shop water softeners on Amazon.com →

Shop Now

What Makes Port Royal's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 348.3 mg/LpH: 8

The Hilton Head Public Service District supplies water to residents in Port Royal, Folly Field, and Mathews Drive, drawing from local groundwater wells. These wells tap into the surficial aquifer, with treatment occurring at facilities like the Port Royal Water Treatment Plant. Additionally, the Beaufort-Jasper Water and Sewer Authority also serves parts of Port Royal, employing advanced treatment for its groundwater sources to meet federal drinking water standards. Unlike some regions, this area doesn't rely on surface water from reservoirs or rivers.

The water's origin within the Port Royal Sound watershed is geologically shaped by the Coastal Plain's unconsolidated sediments. Specifically, the surficial aquifer, which is a shallow part of the larger Floridan aquifer system, contains quartz sands and occasional limestone fragments from Tertiary and Quaternary deposits. This geological makeup is responsible for the water's very soft quality; minimal contact with carbonate rocks means low mineral content, a stark contrast to the harder groundwaters found further inland.

Because the water is very soft, you'll find it's gentle on your appliances, reducing the likelihood of scale buildup in things like water heaters and dishwashers. Soap will lather easily, meaning you won't need as much detergent. Homeowners typically don't need a water softener, and in fact, the very soft nature of the supply might slightly increase the risk of corrosion in metal pipes. Regular flushing and using pH-balanced cleaners are usually sufficient for maintenance, rather than the descaling required for harder water supplies. Recent reports confirm the water meets all federal standards, with no significant contaminant issues.

Geology & Source: surficial aquifer system; Quaternary sands, gravels, and clays; low carbonate sediments yield soft water

Other South Carolina Water Reports

Beaufort

≈ 0–60 mg/L

🟢 Soft

Hilton Head

≈ 120–179 mg/L

🟠 Hard

Hilton Head Island

≈ 120–179 mg/L

🟠 Hard

Bluffton

≈ 0–60 mg/L

🟢 Soft

Report an Issue

Notice an error or missing data? Help us keep this page accurate. If you spot incorrect water hardness, outdated utility info, or missing details, please let us know.

All reports are reviewed by our team. Thank you for supporting data quality!

Frequently Asked Questions

Is Port Royal's water safe to drink?

Yes. Port Royal's water meets all federal safety standards. The hardness is ≈ 0–59 mg/L (Soft), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Port Royal?

Port Royal's water is soft at ≈ 0–59 mg/L. A water softener is generally not necessary, though a carbon filter can improve taste and remove any remaining chlorine.

How does Port Royal compare to the USA average?

The USA national average is 151 mg/L. Port Royal (≈ 0–59 mg/L) is 121 mg/L below the national average. The softest major city is Scarsdale at just 0.02 mg/L.

Data Sources & Methodology

Water quality data for Port Royal is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.

Estimated

Water Hardness

Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.

Estimated

Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.

Estimated

TDS — Total Dissolved Solids

Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.

Measured

PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances

EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.

Modelled

Lead

Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.

Calculated

Appliance Lifespan

Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.