Water hardness in Roseira
94 mg/L moderately hard
Tap water in Roseira is moderately hard: 94 mg/L (5.5 gpg · 5.3 °dH · 9.4 °fH).
Source: Ministério da Saúde, SISAGUA – controle semestral (Companhia De Saneamento Basico Do Estado De Sao Paulo), CC BY-ND 3.0 (2025) · data checked 2026-10-20
Range across supply zones: 91–98 mg/L.
Tap water in Roseira, São Paulo, is supplied by Companhia De Saneamento Basico Do Estado De Sao Paulo. The published figure is 94.2 milligrams per litre of calcium carbonate (moderate), with a narrow range of 90.6 to 97.8. Source: Ministry of Health SISAGUA semiannual control data, 2025; it does not state the water source.
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 | 94 mg/L |
|---|---|
| Utility | Companhia De Saneamento Basico Do Estado De Sao Paulo |
How Roseira compares
- Tap water in Roseira is 122 % harder than the median of the 1915 cities we track in Brazil (43 mg/L).
- By hardness it ranks 247 of 1915 in Brazil (1 = hardest); 87 % of these cities have softer water.
- In São Paulo it is number 46 of 530 cities; the regional median is 42 mg/L.
- Nearest city with clearly softer water: Aparecida, 7 km away (39 mg/L).
- Nearest city with clearly harder water: Paraisópolis, 69 km away (132 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 Roseira
| 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 Roseira water hard or soft?
It is moderately hard: 94 mg/L as CaCO₃ (5.5 gpg, 5.3 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Roseira 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 Roseira water?
5.5 gpg, equal to 5.3 °dH, 9.4 °fH or 94 mg/L calcium carbonate.
What dishwasher salt setting should I use in Roseira?
For 94 mg/L (5.3 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Roseira?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Ministério da Saúde, SISAGUA – controle semestral (Companhia De Saneamento Basico Do Estado De Sao Paulo), CC BY-ND 3.0 (2025). Method: figure published by the water supplier. Ministério da Saúde, SISAGUA – controle semestral (Companhia De Saneamento Basico Do Estado De Sao Paulo), CC BY-ND 3.0 · Outdated figure? Tell us