Water hardness in Columbia, SC
2.1 gpg soft
Tap water in Columbia, SC is soft: 2.1 gpg (36 mg/L · 2 °dH · 3.6 °fH).
Source: Columbia Water 2025 Water Quality Report (2025) · data checked 2026-10-19
Range across supply zones: 20–47 mg/L.
Columbia Water draws surface water from the Broad River through the Columbia Canal and from Lake Murray. Its 2025 report gives an average hardness of 36 mg/L (2.1 gpg), with results between 20 and 47 mg/L. This is soft water, so scale is rarely an issue and a softener adds little.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 2.1 gpg |
|---|---|
| Utility | City of Columbia Water (Columbia Water) |
How Columbia, SC compares
- Tap water in Columbia, SC is 77 % softer than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 1252 of 1372 in the United States (1 = hardest); 9 % of these cities have softer water.
- In South Carolina it is number 5 of 8 cities; the regional median is 2.6 gpg.
- Nearest city with clearly softer water: Summerville, 135 km away (1.3 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 Columbia, SC
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 2 °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 Columbia, SC water hard or soft?
It is soft: 36 mg/L as CaCO₃ (2.1 gpg, 2 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Columbia, SC 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 Columbia, SC water?
2.1 gpg, equal to 2 °dH, 3.6 °fH or 36 mg/L calcium carbonate.
What dishwasher salt setting should I use in Columbia, SC?
For 36 mg/L (2 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Columbia, SC?
No. With soft water a softener adds nothing.
Source
Source: Columbia Water 2025 Water Quality Report (2025). Method: figure published by the water supplier. Columbia Water 2025 Water Quality Report · Outdated figure? Tell us