Water hardness in Estrela de Alagoas
113 mg/L moderately hard
Tap water in Estrela de Alagoas is moderately hard: 113 mg/L (6.6 gpg · 6.3 °dH · 11.3 °fH).
Source: Ministério da Saúde, SISAGUA – controle semestral (Companhia De Saneamento De Alagoas), CC BY-ND 3.0 (2025) · data checked 2026-10-20
Range across supply zones: 110–116 mg/L.
Tap water in Estrela de Alagoas (Alagoas) is supplied by Companhia De Saneamento De Alagoas, and the 2025 figure reported to the Ministry of Health is 113.0 mg/L, which counts as moderately hard. Individual results ranged narrowly from 110.0 to 116.0 mg/L. Some limescale can form on kettles and fixtures over time.
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 | 113 mg/L |
|---|---|
| Utility | Companhia De Saneamento De Alagoas |
How Estrela de Alagoas compares
- Tap water in Estrela de Alagoas is 166 % harder than the median of the 1915 cities we track in Brazil (43 mg/L).
- By hardness it ranks 145 of 1915 in Brazil (1 = hardest); 92 % of these cities have softer water.
- In Alagoas it is number 1 of 10 cities; the regional median is 24 mg/L.
- Nearest city with clearly softer water: Arapiraca, 43 km away (32 mg/L).
- Nearest city with clearly harder water: Moita Bonita, 147 km away (182 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 Estrela de Alagoas
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 6 °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 Estrela de Alagoas water hard or soft?
It is moderately hard: 113 mg/L as CaCO₃ (6.6 gpg, 6.3 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Estrela de Alagoas 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 Estrela de Alagoas water?
6.6 gpg, equal to 6.3 °dH, 11.3 °fH or 113 mg/L calcium carbonate.
What dishwasher salt setting should I use in Estrela de Alagoas?
For 113 mg/L (6.3 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Estrela de Alagoas?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Ministério da Saúde, SISAGUA – controle semestral (Companhia De Saneamento De Alagoas), CC BY-ND 3.0 (2025). Method: figure published by the water supplier. Ministério da Saúde, SISAGUA – controle semestral (Companhia De Saneamento De Alagoas), CC BY-ND 3.0 · Outdated figure? Tell us