Water hardness in Adamantina
12 mg/L soft
Tap water in Adamantina is soft: 12 mg/L (0.7 gpg · 0.7 °dH · 1.2 °fH).
Source: Ministério da Saúde, SISAGUA – controle semestral (Companhia De Saneamento Basico Do Estado De Sao Paulo), CC BY-ND 3.0 (2025) · data checked 2026-10-20
Range across supply zones: 3–21 mg/L.
Adamantina (São Paulo state) is served by Sabesp. The 2025 SISAGUA median is 11.8 mg/L as CaCO3, with results from 3.0 to 21.0 mg/L. This is very soft water, so little scale is expected.
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 | 12 mg/L |
|---|---|
| Utility | Companhia De Saneamento Basico Do Estado De Sao Paulo |
How Adamantina compares
- Tap water in Adamantina is 72 % softer than the median of the 1915 cities we track in Brazil (43 mg/L).
- By hardness it ranks 1762 of 1915 in Brazil (1 = hardest); 8 % of these cities have softer water.
- In São Paulo it is number 476 of 530 cities; the regional median is 42 mg/L.
- Nearest city with clearly softer water: Alfredo Marcondes, 51 km away (9 mg/L).
- Nearest city with clearly harder water: Lucélia, 8 km away (17 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 Adamantina
| 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 Adamantina water hard or soft?
It is soft: 12 mg/L as CaCO₃ (0.7 gpg, 0.7 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Adamantina 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 Adamantina water?
0.7 gpg, equal to 0.7 °dH, 1.2 °fH or 12 mg/L calcium carbonate.
What dishwasher salt setting should I use in Adamantina?
For 12 mg/L (0.7 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Adamantina?
No. With soft water a softener adds nothing.
Source
Source: Ministério da Saúde, SISAGUA – controle semestral (Companhia De Saneamento Basico Do Estado De Sao Paulo), CC BY-ND 3.0 (2025). Method: figure published by the water supplier. Ministério da Saúde, SISAGUA – controle semestral (Companhia De Saneamento Basico Do Estado De Sao Paulo), CC BY-ND 3.0 · Outdated figure? Tell us