Water hardness in Ilha Solteira
127 mg/L hard
Tap water in Ilha Solteira is hard: 127 mg/L (7.4 gpg · 7.1 °dH · 12.7 °fH).
Source: Ministério da Saúde, SISAGUA – controle semestral (Prefeitura Municipal De Ilha Solteira), CC BY-ND 3.0 (2026) · data checked 2026-10-20
Range across supply zones: 71–182 mg/L.
Ilha Solteira, in the state of São Paulo, is supplied by the municipal government (Prefeitura Municipal De Ilha Solteira). The Ministry of Health reports a median hardness of 126.6 mg/L, with samples from 70.8 to 181.7 mg/L (2026 data). That is hard water, so limescale on heating elements and fixtures is likely.
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 | 127 mg/L |
|---|---|
| Utility | Prefeitura Municipal De Ilha Solteira |
How Ilha Solteira compares
- Tap water in Ilha Solteira is 198 % harder than the median of the 1915 cities we track in Brazil (43 mg/L).
- By hardness it ranks 102 of 1915 in Brazil (1 = hardest); 95 % of these cities have softer water.
- In São Paulo it is number 12 of 530 cities; the regional median is 42 mg/L.
- Nearest city with clearly softer water: Itapura, 20 km away (81 mg/L).
- Nearest city with clearly harder water: Emilianópolis, 145 km away (180 mg/L).
Ranking of the hardest and softest water in Brazil →
What it means at home
- Fast scale on taps, shower screens and kettle; white spots on glassware.
- Water heater: efficiency loss and element failures within years if unprotected.
- Dry skin and dull hair after showering are common.
- Softener recommended; jug or reverse osmosis for drinking.
How much salt will you use for softening?
Recommended, especially with a heater or boiler: scale cuts efficiency and shortens its life.
Descale a coffee machine or kettle about every 2 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Ilha Solteira
| Brand | Setting for this water |
|---|---|
| Bosch | H01 |
| Miele | 7 °dH |
| AEG / Electrolux | 2 |
| Beko | 2nd |
| Hoover | S1 |
| 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 Ilha Solteira water hard or soft?
It is hard: 127 mg/L as CaCO₃ (7.4 gpg, 7.1 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Ilha Solteira 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 Ilha Solteira water?
7.4 gpg, equal to 7.1 °dH, 12.7 °fH or 127 mg/L calcium carbonate.
What dishwasher salt setting should I use in Ilha Solteira?
For 127 mg/L (7.1 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Ilha Solteira?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: Ministério da Saúde, SISAGUA – controle semestral (Prefeitura Municipal De Ilha Solteira), CC BY-ND 3.0 (2026). Method: figure published by the water supplier. Ministério da Saúde, SISAGUA – controle semestral (Prefeitura Municipal De Ilha Solteira), CC BY-ND 3.0 · Outdated figure? Tell us