Water Hardness in South Carolina (SC)
South Carolina has an average water hardness of 50 ppm (2.9 grains per gallon), which is classified as Soft . South Carolina enjoys naturally soft water that requires no softening treatment. Residents benefit from easy soap lathering, spot-free dishes, and long-lasting plumbing and appliances. Water hardness varies between cities — from 15 ppm in Spartanburg to 90 ppm in Myrtle Beach.
Water Hardness by City in South Carolina
The table below shows water hardness data for 8 cities in South Carolina, sorted from hardest to softest. Click any city name for detailed information including water source, treatment recommendations, and estimated hard water costs.
| City | Hardness (PPM) | Grains/Gallon | Level | Water Source | pH | TDS | Utility |
|---|---|---|---|---|---|---|---|
| Myrtle Beach | 90 ppm | 5.3 gpg | Slightly Hard | Ground | 7.4 | 140 | Grand Strand Water and Sewer Authority |
| Hilton Head | 85 ppm | 5 gpg | Slightly Hard | Ground | 7.4 | 130 | Hilton Head Public Service District |
| Florence | 65 ppm | 3.8 gpg | Slightly Hard | Ground | 7.2 | 100 | City of Florence |
| Charleston | 45 ppm | 2.6 gpg | Soft | Surface | 7.2 | 68 | Charleston Water System |
| Columbia | 30 ppm | 1.8 gpg | Soft | Surface | 7 | 48 | City of Columbia Water |
| Rock Hill | 25 ppm | 1.5 gpg | Soft | Surface | 6.9 | 40 | City of Rock Hill Utilities |
| Greenville | 18 ppm | 1.1 gpg | Soft | Surface | 6.8 | 28 | Greenville Water |
| Spartanburg | 15 ppm | 0.9 gpg | Soft | Surface | 6.8 | 24 | Spartanburg Water |
Understanding Water Hardness in South Carolina
Water Sources in South Carolina
The majority of cities in South Carolina draw their water from surface sources such as rivers, lakes, and reservoirs. Surface water generally contains fewer dissolved minerals than groundwater, which helps explain the overall hardness profile of the state. Cities that rely on surface water tend to have softer water because the water has less contact time with mineral-bearing rock formations underground.
Hardness Variation Across South Carolina
Water hardness in South Carolina ranges from 15 ppm in Spartanburg to 90 ppm in Myrtle Beach — a difference of 75 ppm. This variation means that treatment recommendations differ significantly between cities. Even the hardest water in South Carolina is moderate enough that a water softener is optional rather than essential, though homeowners who value spotless dishes and softer-feeling water may still find one worthwhile. Meanwhile, Spartanburg enjoys naturally soft water that needs no treatment at all — an advantage that saves residents money on both equipment and ongoing maintenance.
How South Carolina Compares to Other States
Below is a comparison of South Carolina with five states that have similar average water hardness levels. Understanding how your state compares can help you gauge whether your water is typical for the region or unusually hard or soft.
| State | Avg Hardness | Level | Cities |
|---|---|---|---|
| South Carolina (SC) | 50 ppm | Soft | 8 |
| Arkansas (AR) | 55 ppm | Soft | 8 |
| Hawaii (HI) | 40 ppm | Soft | 8 |
| North Carolina (NC) | 60 ppm | Soft | 9 |
| Alaska (AK) | 65 ppm | Slightly Hard | 7 |
| Connecticut (CT) | 35 ppm | Soft | 8 |
Find Your City's Water Hardness
Use our water hardness lookup tool to find your specific city in South Carolina, or browse all 50 states to compare water hardness across the country. If your water is hard, visit our treatment solutions guide to find the right softener or conditioner for your home.