Water hardness in Pirna
7.2 °dH hard
Tap water in Pirna is hard: 7.2 °dH (129 mg/L · 7.6 gpg · 12.9 °fH).
Source: Stadtwerke Pirna – Trinkwasser Allgemeines (2025) · data checked 2026-10-23
Range across supply zones: 125–134 mg/L.
Stadtwerke Pirna publishes a general drinking water page from which a hardness of 129.4 mg/L CaCO₃ is computed, with a range of 125.0 to 133.9 mg/L. The source is dated 2025. The range is narrow, so values should be similar across the supply area. Dresden, 18 km away, is listed at 137.1 mg/L.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 7.2 °dH |
|---|---|
| Utility | Stadtwerke Pirna GmbH |
How Pirna compares
- Tap water in Pirna is 37 % softer than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 620 of 809 in Germany (1 = hardest); 23 % of these cities have softer water.
- In Sachsen it is number 12 of 38 cities; the regional median is 5.2 °dH.
- Nearest city with clearly softer water: Zittau, 61 km away (5 °dH).
- Nearest city with clearly harder water: Großröhrsdorf, 28 km away (9.6 °dH).
Ranking of the hardest and softest water in Germany →
What it means at home
- Fast scale on taps, shower screens and kettle; white spots on glassware.
- Water heater: efficiency loss and element failures within years if unprotected.
- Dry skin and dull hair after showering are common.
- Softener recommended; jug or reverse osmosis for drinking.
How much salt will you use for softening?
Recommended, especially with a heater or boiler: scale cuts efficiency and shortens its life.
Descale a coffee machine or kettle about every 2 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Pirna
| Brand | Setting for this water |
|---|---|
| Bosch | H01 |
| Miele | 7 °dH |
| AEG / Electrolux | 2 |
| Beko | 2nd |
| Hoover | S1 |
| LG | H2 |
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 Pirna water hard or soft?
It is hard: 129 mg/L as CaCO₃ (7.6 gpg, 7.2 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Pirna safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
How many grains per gallon is Pirna water?
7.6 gpg, equal to 7.2 °dH, 12.9 °fH or 129 mg/L calcium carbonate.
What dishwasher salt setting should I use in Pirna?
For 129 mg/L (7.2 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Pirna?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: Stadtwerke Pirna – Trinkwasser Allgemeines (2025). Method: computed from supplier's calcium and magnesium. Stadtwerke Pirna – Trinkwasser Allgemeines · Outdated figure? Tell us