Rock Hill, SC water hardness

Tap water hardness
33mg/L
1.9gpg
Soft

Reported by Rock Hill City of (Sc4610002) · September 2025

SC typical
32 mg/L
EPA health violations since 2016
0
Data
Utility report

Rock Hill water measures 33 mg/L (1.9 gpg) of hardness, soft by USGS standards. The number comes from Rock Hill City of (Sc4610002), dated September 2025.

Rock Hill on the hardness scale, with nearby cities
060120180240300360+SC typical 32Spartanburg: 16 mg/LSpartanburg 16Gaffney: 21 mg/LGaffney 21Tega Cay: 28 mg/LTega Cay 28Fort Mill: 31 mg/LFort Mill 31Blythewood: 37 mg/LBlythewood 37Lake Murray of Richland: 37 mg/LLake Murray of Richland 37Irmo: 37 mg/LIrmo 37Dentsville: 37 mg/LDentsville 37Woodfield: 37 mg/LWoodfield 37St. Andrews: 37 mg/LSt. Andrews 37Rock Hill 33mg/L as calcium carbonate060120180240300360+SC 32Spartanburg: 16 mg/LSpartanburg 16Gaffney: 21 mg/LGaffney 21Tega Cay: 28 mg/LTega Cay 28Fort Mill: 31 mg/LFort Mill 31Blythewood: 37 mg/LBlythewood 37Lake Murray of Richland: 37 mg/LLake Murra. 3733 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Rock Hill sits close to the typical South Carolina figure of 32 mg/L. Of the 10 nearest cities we track, 4 have softer water and 6 have harder. The range nearby runs from 16 mg/L in Spartanburg to 37 in Blythewood.

What 33 mg/L means at home

Soap and shampoo lather with very little product. Kettles and showerheads stay mostly free of white crust.

Some people notice that soap feels slow to rinse off in soft water. That slippery feel is normal and harmless.

Hardness is not a health problem, and EPA sets no limit for it. It is a matter of scale and soap.

What to do about it

Nothing, as far as hardness goes. At 33 mg/L a softener would have almost nothing to remove.

Carbon filter

If the water tastes of chlorine, a pitcher or faucet carbon filter takes care of that. It does not change hardness.

EPA record for Rock Hill's water system

Rock Hill City of (Sc4610002) · PWSID SC4610002

No health-based violations since 2016

Serves about 89,850 people from surface water.

Health-based
0
Monitoring or reporting
0
Open now
0

Health-based means a contaminant above its legal limit or a missed treatment step. Monitoring and reporting violations are late or missing tests and notices. Source: EPA ECHO, 2026Q3 export, violations with periods starting 2016 or later. Full EPA record.

Questions

Is Rock Hill water hard?

No. It measures about 33 mg/L (1.9 grains per gallon), which the USGS classes as soft.

What is the water hardness in Rock Hill in grains per gallon?

About 1.9 gpg. One grain per gallon equals 17.1 mg/L, so 33 mg/L divided by 17.1 gives 1.9.

Has the Rock Hill water system had EPA violations?

EPA records show no health-based violations for Rock Hill City of (Sc4610002) since 2016.

Nearby cities

All 58 cities in South Carolina

Hardness data: TapWaterData US Water Hardness (utility report, September 3, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.