Water hardness in Santo Antônio da Patrulha
124 mg/L hard
Tap water in Santo Antônio da Patrulha is hard: 124 mg/L (7.3 gpg · 7 °dH · 12.4 °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: 35–229 mg/L.
Santo Antônio da Patrulha, in Rio Grande do Sul, is supplied by CORSAN. The 2026 SISAGUA median is 124.2 mg/L as CaCO₃, which is hard. The range is very wide, from 34.9 to 228.7 mg/L, so the result depends heavily on the supply point. Scale on heaters is likely in the harder areas.
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 | 124 mg/L |
|---|---|
| Utility | Companhia Riograndense De Saneamento |
How Santo Antônio da Patrulha compares
- Tap water in Santo Antônio da Patrulha is 192 % harder than the median of the 1915 cities we track in Brazil (43 mg/L).
- By hardness it ranks 108 of 1915 in Brazil (1 = hardest); 94 % of these cities have softer water.
- In Rio Grande do Sul it is number 14 of 244 cities; the regional median is 60 mg/L.
- Nearest city with clearly softer water: Taquara, 26 km away (38 mg/L).
- Nearest city with clearly harder water: Feliz, 80 km away (180 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 Santo Antônio da Patrulha
| Brand | Setting for this water |
|---|---|
| Bosch | H01 |
| Miele | 7 °dH |
| AEG / Electrolux | 2 |
| Beko | 2nd |
| 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 Santo Antônio da Patrulha water hard or soft?
It is hard: 124 mg/L as CaCO₃ (7.3 gpg, 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 Santo Antônio da Patrulha 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 Santo Antônio da Patrulha water?
7.3 gpg, equal to 7 °dH, 12.4 °fH or 124 mg/L calcium carbonate.
What dishwasher salt setting should I use in Santo Antônio da Patrulha?
For 124 mg/L (7 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Santo Antônio da Patrulha?
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