Water hardness in São Miguel do Oeste
57 mg/L soft
Tap water in São Miguel do Oeste is soft: 57 mg/L (3.3 gpg · 3.2 °dH · 5.7 °fH).
Source: Ministério da Saúde, SISAGUA – controle semestral (Companhia Catarinense De Aguas E Saneamento), CC BY-ND 3.0 (2026) · data checked 2026-10-20
Range across supply zones: 50–64 mg/L.
São Miguel do Oeste (Santa Catarina) is supplied by CASAN, the state water company. The 2026 SISAGUA median is 56.7 mg/L as CaCO3, with samples from 49.6 to 63.8 mg/L. That is soft, close to the upper edge of the category.
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 | 57 mg/L |
|---|---|
| Utility | Companhia Catarinense De Aguas E Saneamento |
How São Miguel do Oeste compares
- Tap water in São Miguel do Oeste is 33 % harder than the median of the 1915 cities we track in Brazil (43 mg/L).
- By hardness it ranks 674 of 1915 in Brazil (1 = hardest); 65 % of these cities have softer water.
- In Santa Catarina it is number 56 of 238 cities; the regional median is 34 mg/L.
- Nearest city with clearly softer water: Bandeirante, 14 km away (29 mg/L).
- Nearest city with clearly harder water: Barra Bonita, 11 km away (87 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 Miguel do Oeste
| 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 Miguel do Oeste water hard or soft?
It is soft: 57 mg/L as CaCO₃ (3.3 gpg, 3.2 °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 Miguel do Oeste 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 Miguel do Oeste water?
3.3 gpg, equal to 3.2 °dH, 5.7 °fH or 57 mg/L calcium carbonate.
What dishwasher salt setting should I use in São Miguel do Oeste?
For 57 mg/L (3.2 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in São Miguel do Oeste?
No. With soft water a softener adds nothing.
Source
Source: Ministério da Saúde, SISAGUA – controle semestral (Companhia Catarinense De Aguas E Saneamento), CC BY-ND 3.0 (2026). Method: figure published by the water supplier. Ministério da Saúde, SISAGUA – controle semestral (Companhia Catarinense De Aguas E Saneamento), CC BY-ND 3.0 · Outdated figure? Tell us