Water hardness in Mountain Brook
5.7 gpg moderately hard
Tap water in Mountain Brook is moderately hard: 5.7 gpg (98 mg/L · 5.5 °dH · 9.8 °fH).
Source: Birmingham Water Works Board 2025 CCR (2024 data) (2025) · data checked 2026-11-02
Range across supply zones: 40–156 mg/L.
Birmingham Water Works Board supplies Mountain Brook. Its 2025 report, with 2024 data, gives a computed 98.0 mg/L, within a range of 40.0 to 156.0 mg/L. The range is wide, so hardness at the tap can shift. The average is moderate.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 5.7 gpg |
|---|---|
| Utility | Birmingham Water Works Board |
How Mountain Brook compares
- Tap water in Mountain Brook is 37 % softer than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 1030 of 1372 in the United States (1 = hardest); 25 % of these cities have softer water.
- In Alabama it is number 6 of 17 cities; the regional median is 4.6 gpg.
Ranking of the hardest and softest water in the United States →
What it means at home
- Visible kettle scale every few weeks; vinegar or citric acid is enough.
- Water heater and washing machine: some long-term scale; a scale inhibitor slows it.
- Dishwasher: medium salt setting.
- Softener optional; pays off mainly with a gas boiler or tankless heater.
How much salt will you use for softening?
Optional. A scale inhibitor or a small softener protects the heater; soap savings are modest.
Descale a coffee machine or kettle about every 3 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Mountain Brook
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 5 °dH |
| AEG / Electrolux | 2 |
| Beko | 2nd |
| Hoover | S1 |
| LG | H1 |
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 Mountain Brook water hard or soft?
It is moderately hard: 98 mg/L as CaCO₃ (5.7 gpg, 5.5 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Mountain Brook safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
How many grains per gallon is Mountain Brook water?
5.7 gpg, equal to 5.5 °dH, 9.8 °fH or 98 mg/L calcium carbonate.
What dishwasher salt setting should I use in Mountain Brook?
For 98 mg/L (5.5 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Mountain Brook?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Birmingham Water Works Board 2025 CCR (2024 data) (2025). Method: computed from supplier's calcium and magnesium. Birmingham Water Works Board 2025 CCR (2024 data) · Outdated figure? Tell us