Water hardness in Riedering
18.8 °dH very hard
Tap water in Riedering is very hard: 18.8 °dH (336 mg/L · 19.6 gpg · 33.6 °fH).
Source: Gemeinde Riedering: Pruefbericht AGROLAB Auftrag 2133493 (Trinkwasser Gruppe A), with Gemeinde page Abwasser-und-Wasser stating durchschnittliche Gesamthaerte 18,8 dH for the Gemeindegebiet (2026-10) · data checked 2026-11-06
For Riedering, the AGROLAB test report of October 2026 gives a value of 335.6 mg/L. The municipality's own page also states an average total hardness of 18.8 °dH for the municipal area. This is a municipal average, not a figure for individual streets.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 18.8 °dH |
|---|
How Riedering compares
- Tap water in Riedering is 63 % harder than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 115 of 809 in Germany (1 = hardest); 86 % of these cities have softer water.
- In Bayern it is number 37 of 137 cities; the regional median is 15.8 °dH.
- Nearest city with clearly softer water: Trostberg an der Alz, 31 km away (14.4 °dH).
- Nearest city with clearly harder water: Tuntenhausen, 19 km away (23.9 °dH).
Ranking of the hardest and softest water in Germany →
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 Riedering
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 19 °dH |
| AEG / Electrolux | 5 |
| Beko | 5th |
| Hoover | S3 |
| LG | H3 |
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 Riedering water hard or soft?
It is very hard: 336 mg/L as CaCO₃ (19.6 gpg, 18.8 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Riedering 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 Riedering water?
19.6 gpg, equal to 18.8 °dH, 33.6 °fH or 336 mg/L calcium carbonate.
What dishwasher salt setting should I use in Riedering?
For 336 mg/L (18.8 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Riedering?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Gemeinde Riedering: Pruefbericht AGROLAB Auftrag 2133493 (Trinkwasser Gruppe A), with Gemeinde page Abwasser-und-Wasser stating durchschnittliche Gesamthaerte 18,8 dH for the Gemeindegebiet (2026-10). Method: figure published by the water supplier. Gemeinde Riedering: Pruefbericht AGROLAB Auftrag 2133493 (Trinkwasser Gruppe A), with Gemeinde page Abwasser-und-Wasser stating durchschnittliche Gesamthaerte 18,8 dH for the Gemeindegebiet · Outdated figure? Tell us