Water hardness in Circleville
25 gpg very hard
Tap water in Circleville is very hard: 25 gpg (428 mg/L · 24 °dH · 42.8 °fH).
Source: City of Circleville Water Treatment Plant page (2026) · data checked 2026-10-29
The City of Circleville Water Treatment Plant lists a hardness of 428 mg/L on its web page (2026). That is well into the very hard band. Hardness this high usually means scale builds up quickly in kettles, pipes and heaters. The page gives no range or sampling date.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 25 gpg |
|---|---|
| Utility | City of Circleville Water Treatment Plant |
How Circleville compares
- Tap water in Circleville is 176 % harder than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 37 of 1372 in the United States (1 = hardest); 97 % of these cities have softer water.
- In Ohio it is number 1 of 31 cities; the regional median is 7 gpg.
Ranking of the hardest and softest water in the United States →
What it means at home
- Severe scale: heater elements and washing-machine heaters fail early.
- Detergent use is very high; taps and screens coat within days.
- Dishwasher at maximum salt setting.
- An ion-exchange softener is practically essential; RO for drinking water.
How much salt will you use for softening?
Yes. At this hardness a softener pays for itself through appliance life and detergent.
Descale a coffee machine or kettle about every 1 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Circleville
| Brand | Setting for this water |
|---|---|
| Bosch | H06 |
| Miele | 24 °dH |
| AEG / Electrolux | 6 |
| Beko | 6th |
| Hoover | S3 |
| LG | H4 |
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 Circleville water hard or soft?
It is very hard: 428 mg/L as CaCO₃ (25 gpg, 24 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Circleville 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 Circleville water?
25 gpg, equal to 24 °dH, 42.8 °fH or 428 mg/L calcium carbonate.
What dishwasher salt setting should I use in Circleville?
For 428 mg/L (24 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Circleville?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: City of Circleville Water Treatment Plant page (2026). Method: figure published by the water supplier. City of Circleville Water Treatment Plant page · Outdated figure? Tell us