Water hardness in Sobradinho
85 mg/L moderately hard
Tap water in Sobradinho is moderately hard: 85 mg/L (5 gpg · 4.8 °dH · 8.5 °fH).
Source: Ministério da Saúde, SISAGUA – controle semestral (Companhia Riograndense De Saneamento), CC BY-ND 3.0 (2026) · data checked 2026-10-20
Range across supply zones: 44–102 mg/L.
Sobradinho, in Rio Grande do Sul, is supplied by Companhia Riograndense de Saneamento. The 2026 figure is 84.9 milligrams per litre as calcium carbonate, which is moderate. Reported values span 44.3 to 101.5 milligrams per litre.
Portaria GM/MS nº 888/2021 sets a maximum of 300 mg/L CaCO₃ for total hardness (dureza total); operators report it in mg/L to SISAGUA.
Water data
| Total hardness | 85 mg/L |
|---|---|
| Utility | Companhia Riograndense De Saneamento |
How Sobradinho compares
- Tap water in Sobradinho is 100 % harder than the median of the 1915 cities we track in Brazil (43 mg/L).
- By hardness it ranks 317 of 1915 in Brazil (1 = hardest); 83 % of these cities have softer water.
- In Rio Grande do Sul it is number 66 of 244 cities; the regional median is 60 mg/L.
- Nearest city with clearly softer water: Lagoa Bonita do Sul, 9 km away (40 mg/L).
- Nearest city with clearly harder water: Nova Palma, 40 km away (115 mg/L).
Ranking of the hardest and softest water in Brazil →
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 Sobradinho
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 5 °dH |
| AEG / Electrolux | 2 |
| Beko | 2nd |
| 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 Sobradinho water hard or soft?
It is moderately hard: 85 mg/L as CaCO₃ (5 gpg, 4.8 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Sobradinho safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Portaria GM/MS nº 888/2021 sets a maximum of 300 mg/L CaCO₃ for total hardness (dureza total); operators report it in mg/L to SISAGUA.
How many grains per gallon is Sobradinho water?
5 gpg, equal to 4.8 °dH, 8.5 °fH or 85 mg/L calcium carbonate.
What dishwasher salt setting should I use in Sobradinho?
For 85 mg/L (4.8 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Sobradinho?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Ministério da Saúde, SISAGUA – controle semestral (Companhia Riograndense De Saneamento), CC BY-ND 3.0 (2026). Method: figure published by the water supplier. Ministério da Saúde, SISAGUA – controle semestral (Companhia Riograndense De Saneamento), CC BY-ND 3.0 · Outdated figure? Tell us