Water hardness in Hastings
81 mg/L moderately hard
Tap water in Hastings is moderately hard: 81 mg/L (4.8 gpg · 4.6 °dH · 8.1 °fH).
Source: Southern Water — domestic drinking water quality (Stream open data, CC BY) (2026-04) · data checked 2026-10-19
Range across supply zones: 71–92 mg/L.
Hastings is supplied by Southern Water, which takes about 70% of its water from groundwater, mostly the chalk aquifer under south-east England, with the rest from rivers and four reservoirs. Reported hardness is 81.4 mg/L CaCO₃, ranging from 71.2 to 92.2 mg/L between supply zones. This area is served by a mix of river, reservoir and groundwater sources, so the water is softer than the chalk-fed supply elsewhere in the region; 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 | 81 mg/L |
|---|---|
| Utility | Southern Water |
How Hastings compares
- Tap water in Hastings is 56 % softer than the median of the 471 cities we track in the United Kingdom (185 mg/L).
- By hardness it ranks 343 of 471 in the United Kingdom (1 = hardest); 27 % of these cities have softer water.
- Nearest city with clearly harder water: Lewes, 40 km away (260 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 Hastings
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 5 °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 Hastings water hard or soft?
It is moderately hard: 81 mg/L as CaCO₃ (4.8 gpg, 4.6 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Hastings 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 Hastings water?
4.8 gpg, equal to 4.6 °dH, 8.1 °fH or 81 mg/L calcium carbonate.
What dishwasher salt setting should I use in Hastings?
For 81 mg/L (4.6 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Hastings?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Southern Water — domestic drinking water quality (Stream open data, CC BY) (2026-04). Method: own measurement. Southern Water — domestic drinking water quality (Stream open data, CC BY) · Outdated figure? Tell us