Water hardness in Ararendá
710 mg/L very hard
Tap water in Ararendá is very hard: 710 mg/L (41.5 gpg · 39.8 °dH · 71 °fH).
Source: Ministério da Saúde, SISAGUA – controle semestral (Companhia De Agua E Esgoto Do Ceara), CC BY-ND 3.0 (2026) · data checked 2026-10-29
Range across supply zones: 695–726 mg/L.
Tap water in Ararendá, Ceará, is supplied by Companhia De Agua E Esgoto Do Ceara. The published figure is 710.3 milligrams per litre of calcium carbonate (very hard), with readings from 694.6 to 726.0, so the value is consistently high. Source: Ministry of Health SISAGUA semiannual control data, 2026; 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 | 710 mg/L |
|---|---|
| Utility | Companhia De Agua E Esgoto Do Ceara |
How Ararendá compares
- Tap water in Ararendá is 1571 % harder than the median of the 1915 cities we track in Brazil (43 mg/L).
- By hardness it ranks 1 of 1915 in Brazil (1 = hardest); 100 % of these cities have softer water.
- In Ceará it is number 1 of 47 cities; the regional median is 115 mg/L.
- Nearest city with clearly softer water: Poranga, 20 km away (6 mg/L).
Ranking of the hardest and softest water in Brazil →
What it means at home
- Severe scale: heater elements and washing-machine heaters fail early.
- Detergent use is very high; taps and screens coat within days.
- Dishwasher at maximum salt setting.
- An ion-exchange softener is practically essential; RO for drinking water.
How much salt will you use for softening?
Yes. At this hardness a softener pays for itself through appliance life and detergent.
Descale a coffee machine or kettle about every 1 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Ararendá
| Brand | Setting for this water |
|---|---|
| Bosch | H07 |
| Miele | 40 °dH |
| AEG / Electrolux | 8 |
| Beko | 6th |
| Hoover | S5 |
| LG | H4 |
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 Ararendá water hard or soft?
It is very hard: 710 mg/L as CaCO₃ (41.5 gpg, 39.8 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Ararendá 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 Ararendá water?
41.5 gpg, equal to 39.8 °dH, 71 °fH or 710 mg/L calcium carbonate.
What dishwasher salt setting should I use in Ararendá?
For 710 mg/L (39.8 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Ararendá?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Ministério da Saúde, SISAGUA – controle semestral (Companhia De Agua E Esgoto Do Ceara), CC BY-ND 3.0 (2026). Method: figure published by the water supplier. Ministério da Saúde, SISAGUA – controle semestral (Companhia De Agua E Esgoto Do Ceara), CC BY-ND 3.0 · Outdated figure? Tell us