Water hardness in Paty do Alferes
23 mg/L soft
Tap water in Paty do Alferes is soft: 23 mg/L (1.4 gpg · 1.3 °dH · 2.3 °fH).
Source: Ministério da Saúde, SISAGUA – controle semestral (Igua Rio De Janeiro Sa), CC BY-ND 3.0 (2026) · data checked 2026-10-20
Range across supply zones: 18–29 mg/L.
Igua Rio De Janeiro Sa supplies Paty do Alferes, Rio de Janeiro state. The 2026 median is 23.2 mg/L, with a range of 17.8 to 28.6 mg/L, which is soft.
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 | 23 mg/L |
|---|---|
| Utility | Igua Rio De Janeiro Sa |
How Paty do Alferes compares
- Tap water in Paty do Alferes is 45 % softer than the median of the 1915 cities we track in Brazil (43 mg/L).
- By hardness it ranks 1484 of 1915 in Brazil (1 = hardest); 22 % of these cities have softer water.
- In Rio de Janeiro it is number 13 of 44 cities; the regional median is 14 mg/L.
- Nearest city with clearly softer water: Miguel Pereira, 13 km away (6 mg/L).
- Nearest city with clearly harder water: Paraíba do Sul, 29 km away (74 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 Paty do Alferes
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 1 °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 Paty do Alferes water hard or soft?
It is soft: 23 mg/L as CaCO₃ (1.4 gpg, 1.3 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Paty do Alferes 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 Paty do Alferes water?
1.4 gpg, equal to 1.3 °dH, 2.3 °fH or 23 mg/L calcium carbonate.
What dishwasher salt setting should I use in Paty do Alferes?
For 23 mg/L (1.3 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Paty do Alferes?
No. With soft water a softener adds nothing.
Source
Source: Ministério da Saúde, SISAGUA – controle semestral (Igua Rio De Janeiro Sa), CC BY-ND 3.0 (2026). Method: figure published by the water supplier. Ministério da Saúde, SISAGUA – controle semestral (Igua Rio De Janeiro Sa), CC BY-ND 3.0 · Outdated figure? Tell us