Water hardness in Pompéia
190 mg/L very hard
Tap water in Pompéia is very hard: 190 mg/L (11.1 gpg · 10.6 °dH · 19 °fH).
Source: Ministério da Saúde, SISAGUA – controle semestral (Servico Autonomo De Aguas E Esgotos De Pompeia), CC BY-ND 3.0 (2026) · data checked 2026-10-20
Range across supply zones: 60–190 mg/L.
Pompéia, in São Paulo, is supplied by the Servico Autonomo De Aguas E Esgotos De Pompeia. The 2026 SISAGUA median is 189.6 mg/L as CaCO₃, with readings from 59.7 to 190.0 mg/L, which places it as very hard. Because the range is wide, hardness may differ by location or sampling date.
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 | 190 mg/L |
|---|---|
| Utility | Servico Autonomo De Aguas E Esgotos De Pompeia |
How Pompéia compares
- Tap water in Pompéia is 346 % harder than the median of the 1915 cities we track in Brazil (43 mg/L).
- By hardness it ranks 36 of 1915 in Brazil (1 = hardest); 98 % of these cities have softer water.
- In São Paulo it is number 3 of 530 cities; the regional median is 42 mg/L.
- Nearest city with clearly softer water: Oriente, 16 km away (125 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 Pompéia
| Brand | Setting for this water |
|---|---|
| Bosch | H03 |
| Miele | 11 °dH |
| AEG / Electrolux | 2 |
| Beko | 3rd |
| Hoover | S2 |
| 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 Pompéia water hard or soft?
It is very hard: 190 mg/L as CaCO₃ (11.1 gpg, 10.6 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Pompéia 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 Pompéia water?
11.1 gpg, equal to 10.6 °dH, 19 °fH or 190 mg/L calcium carbonate.
What dishwasher salt setting should I use in Pompéia?
For 190 mg/L (10.6 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Pompéia?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Ministério da Saúde, SISAGUA – controle semestral (Servico Autonomo De Aguas E Esgotos De Pompeia), CC BY-ND 3.0 (2026). Method: figure published by the water supplier. Ministério da Saúde, SISAGUA – controle semestral (Servico Autonomo De Aguas E Esgotos De Pompeia), CC BY-ND 3.0 · Outdated figure? Tell us