Water hardness in Knaresborough
70 mg/L moderately hard
Tap water in Knaresborough is moderately hard: 70 mg/L (4.1 gpg · 3.9 °dH · 7 °fH).
Source: Yorkshire Water — domestic drinking water quality (Stream open data, CC BY) (2026-09) · data checked 2026-10-20
Range across supply zones: 59–84 mg/L.
The tap water in Knaresborough comes from Yorkshire Water, which draws on moorland reservoirs in the west, rivers, and boreholes that are concentrated in the east of the region. Reported hardness is 69.7 mg/L CaCO₃, ranging from 59.4 to 84.3 mg/L between supply zones. The supply here blends softer reservoir water with harder borehole or river water; it sits in the moderately hard band, where limescale appears on kettles and shower heads over months and dishwasher salt helps.
UK suppliers report mg/L CaCO₃ and often Clark degrees (1 °Clark = 14.25 mg/L).
Water data
| Total hardness | 70 mg/L |
|---|---|
| Utility | Yorkshire Water |
How Knaresborough compares
- Tap water in Knaresborough is 62 % softer than the median of the 471 cities we track in the United Kingdom (185 mg/L).
- By hardness it ranks 360 of 471 in the United Kingdom (1 = hardest); 24 % of these cities have softer water.
- In Harrogate it is number 2 of 4 cities; the regional median is 67 mg/L.
- Nearest city with clearly softer water: Otley, 19 km away (54 mg/L).
- Nearest city with clearly harder water: Boroughbridge, 10 km away (252 mg/L).
Ranking of the hardest and softest water in the United Kingdom →
What it means at home
- Visible kettle scale every few weeks; vinegar or citric acid is enough.
- Water heater and washing machine: some long-term scale; a scale inhibitor slows it.
- Dishwasher: medium salt setting.
- Softener optional; pays off mainly with a gas boiler or tankless heater.
How much salt will you use for softening?
Optional. A scale inhibitor or a small softener protects the heater; soap savings are modest.
Descale a coffee machine or kettle about every 3 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Knaresborough
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 4 °dH |
| AEG / Electrolux | 2 |
| Beko | 1st |
| Hoover | S1 |
| LG | H1 |
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 Knaresborough water hard or soft?
It is moderately hard: 70 mg/L as CaCO₃ (4.1 gpg, 3.9 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Knaresborough safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. UK suppliers report mg/L CaCO₃ and often Clark degrees (1 °Clark = 14.25 mg/L).
How many grains per gallon is Knaresborough water?
4.1 gpg, equal to 3.9 °dH, 7 °fH or 70 mg/L calcium carbonate.
What dishwasher salt setting should I use in Knaresborough?
For 70 mg/L (3.9 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Knaresborough?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Yorkshire Water — domestic drinking water quality (Stream open data, CC BY) (2026-09). Method: own measurement. Yorkshire Water — domestic drinking water quality (Stream open data, CC BY) · Outdated figure? Tell us