Mount Pleasant, SC water hardness

Tap water hardness
59mg/L
3.5gpg
Soft

Reported by MT Pleasant Water Works (1010002) · September 2025

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

The water in Mount Pleasant carries roughly 59 mg/L of dissolved calcium and magnesium, or 3.5 grains per gallon. That is soft water. The number comes from MT Pleasant Water Works (1010002), dated September 2025.

Mount Pleasant on the hardness scale, with nearby cities
060120180240300360+SC typical 32Moncks Corner: 20 mg/LMoncks Corner 20Summerville: 26 mg/LSummerville 26Beaufort: 41 mg/LBeaufort 41Port Royal: 43 mg/LPort Royal 43Goose Creek: 46 mg/LGoose Creek 46Hanahan: 51 mg/LHanahan 51North Charleston: 53 mg/LNorth Charleston 53Charleston: 57 mg/LCharleston 57James Island: 58 mg/LJames Island 58Hilton Head Island: 98 mg/LHilton Head Island 98Mount Pleasant 59mg/L as calcium carbonate060120180240300360+SC 32Summerville: 26 mg/LSummerville 26Goose Creek: 46 mg/LGoose Creek 46Hanahan: 51 mg/LHanahan 51North Charleston: 53 mg/LNorth Char. 53Charleston: 57 mg/LCharleston 57James Island: 58 mg/LJames Isla. 5859 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

At 59 mg/L, Mount Pleasant is 27 mg/L above the typical South Carolina figure of 32. Of the 10 nearest cities we track, 9 have softer water and 1 has harder. The range nearby runs from 20 mg/L in Moncks Corner to 98 in Hilton Head Island.

What 59 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 59 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 Mount Pleasant's water system

MT Pleasant Waterworks (Sc1010002) · PWSID SC1010002

No health-based violations since 2016

Serves about 91,500 people from surface water.

Health-based
0
Monitoring or reporting
1
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 Mount Pleasant water hard?

No. It measures about 59 mg/L (3.5 grains per gallon), which the USGS classes as soft.

What is the water hardness in Mount Pleasant in grains per gallon?

About 3.5 gpg. One grain per gallon equals 17.1 mg/L, so 59 mg/L divided by 17.1 gives 3.5.

Has the Mount Pleasant water system had EPA violations?

EPA records show no health-based violations for MT Pleasant Waterworks (Sc1010002) since 2016. There were also 1 monitoring or reporting violation, which are about late or missing tests and notices.

Nearby cities

All 58 cities in South Carolina

Hardness data: TapWaterData US Water Hardness (utility report, September 22, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.