Water hardness in James Island
3.3 gpg soft
Tap water in James Island is soft: 3.3 gpg (56 mg/L · 3.1 °dH · 5.6 °fH).
Source: Charleston Water System Water Quality Results (Monthly Averages) 2024 (2024) · data checked 2026-10-29
Range across supply zones: 45–77 mg/L.
James Island is served by Charleston Water System. Its 2024 monthly averages show hardness of 56 mg/L as CaCO₃, ranging from 45 to 77 mg/L. That is mostly soft water by USGS classes, with some months edging into moderately hard.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 3.3 gpg |
|---|---|
| Utility | Charleston Water System |
How James Island compares
- Tap water in James Island is 64 % softer than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 1195 of 1372 in the United States (1 = hardest); 13 % of these cities have softer water.
- In South Carolina it is number 2 of 8 cities; the regional median is 2.6 gpg.
Ranking of the hardest and softest water in the United States →
What it means at home
- Little or no limescale in kettles, water heaters or washing machines.
- Soap lathers easily; water does not dry skin or hair.
- Dishwasher: salt setting at minimum or off.
- No softener needed; a jug filter only changes taste.
How much salt will you use for softening?
No. Water this soft does not need softening.
Descale a coffee machine or kettle about every 6 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in James Island
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 3 °dH |
| AEG / Electrolux | 1 |
| Beko | 1st |
| Hoover | S0 |
| LG | H0 |
From each brand's manual for the model family named in the source; your model may differ, so check its manual. All brands and how to change the setting →
FAQ
Is James Island water hard or soft?
It is soft: 56 mg/L as CaCO₃ (3.3 gpg, 3.1 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in James Island safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
How many grains per gallon is James Island water?
3.3 gpg, equal to 3.1 °dH, 5.6 °fH or 56 mg/L calcium carbonate.
What dishwasher salt setting should I use in James Island?
For 56 mg/L (3.1 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in James Island?
No. With soft water a softener adds nothing.
Source
Source: Charleston Water System Water Quality Results (Monthly Averages) 2024 (2024). Method: figure published by the water supplier. Charleston Water System Water Quality Results (Monthly Averages) 2024 · Outdated figure? Tell us