Water hardness in São Luiz Gonzaga
49 mg/L soft
Tap water in São Luiz Gonzaga is soft: 49 mg/L (2.9 gpg · 2.7 °dH · 4.9 °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: 36–101 mg/L.
São Luiz Gonzaga (Rio Grande do Sul) is supplied by Corsan. The 2026 SISAGUA median is 48.8 mg/L as CaCO3, but samples range from 36.4 to 101.2 mg/L. The median is soft, and the top of the range reaches moderate hardness, so values vary.
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 | 49 mg/L |
|---|---|
| Utility | Companhia Riograndense De Saneamento |
How São Luiz Gonzaga compares
- Tap water in São Luiz Gonzaga is 15 % harder than the median of the 1915 cities we track in Brazil (43 mg/L).
- By hardness it ranks 828 of 1915 in Brazil (1 = hardest); 57 % of these cities have softer water.
- In Rio Grande do Sul it is number 163 of 244 cities; the regional median is 60 mg/L.
- Nearest city with clearly softer water: Porto Xavier, 57 km away (32 mg/L).
- Nearest city with clearly harder water: Caibaté, 25 km away (75 mg/L).
Ranking of the hardest and softest water in Brazil →
What it means at home
- Little or no limescale in kettles, water heaters or washing machines.
- Soap lathers easily; water does not dry skin or hair.
- Dishwasher: salt setting at minimum or off.
- No softener needed; a jug filter only changes taste.
How much salt will you use for softening?
No. Water this soft does not need softening.
Descale a coffee machine or kettle about every 6 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in São Luiz Gonzaga
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 3 °dH |
| AEG / Electrolux | 1 |
| Beko | 1st |
| Hoover | S0 |
| LG | H0 |
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 São Luiz Gonzaga water hard or soft?
It is soft: 49 mg/L as CaCO₃ (2.9 gpg, 2.7 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in São Luiz Gonzaga 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 São Luiz Gonzaga water?
2.9 gpg, equal to 2.7 °dH, 4.9 °fH or 49 mg/L calcium carbonate.
What dishwasher salt setting should I use in São Luiz Gonzaga?
For 49 mg/L (2.7 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in São Luiz Gonzaga?
No. With soft water a softener adds nothing.
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