Water hardness in Roca Sales
147 mg/L hard
Tap water in Roca Sales is hard: 147 mg/L (8.6 gpg · 8.3 °dH · 14.7 °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: 142–184 mg/L.
Roca Sales, in Rio Grande do Sul, receives water from Companhia Riograndense De Saneamento. The 2026 figure is 147.3 mg/L, which is hard, and reported values run from 142.4 to 183.9 mg/L. Limescale on heating elements and glass is a realistic consequence, so a softener or descaling routine may be worth considering.
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 | 147 mg/L |
|---|---|
| Utility | Companhia Riograndense De Saneamento |
How Roca Sales compares
- Tap water in Roca Sales is 247 % harder than the median of the 1915 cities we track in Brazil (43 mg/L).
- By hardness it ranks 70 of 1915 in Brazil (1 = hardest); 96 % of these cities have softer water.
- In Rio Grande do Sul it is number 7 of 244 cities; the regional median is 60 mg/L.
- Nearest city with clearly softer water: Encantado, 10 km away (70 mg/L).
- Nearest city with clearly harder water: Marques de Souza, 33 km away (205 mg/L).
Ranking of the hardest and softest water in Brazil →
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 Roca Sales
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 8 °dH |
| AEG / Electrolux | 2 |
| Beko | 3rd |
| 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 Roca Sales water hard or soft?
It is hard: 147 mg/L as CaCO₃ (8.6 gpg, 8.3 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Roca Sales 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 Roca Sales water?
8.6 gpg, equal to 8.3 °dH, 14.7 °fH or 147 mg/L calcium carbonate.
What dishwasher salt setting should I use in Roca Sales?
For 147 mg/L (8.3 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Roca Sales?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
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