Water hardness in Marble Falls
10.8 gpg very hard
Tap water in Marble Falls is very hard: 10.8 gpg (185 mg/L · 10.4 °dH · 18.5 °fH).
Source: City of Marble Falls 2025 Drinking Water Quality Report (2025) · data checked 2026-11-12
The City of Marble Falls 2025 drinking water quality report lists total hardness as CaCO3 at 185 mg/L (10.8 gpg), a single citywide value with no range. The city lies in the Texas Hill Country, where limestone geology generally gives hard water. We have not confirmed the exact source water, so treat that as regional context. Expect visible scale on kettles and heaters.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 10.8 gpg |
|---|---|
| Utility | City of Marble Falls water utility |
How Marble Falls compares
- Tap water in Marble Falls is 19 % harder than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 577 of 1372 in the United States (1 = hardest); 58 % of these cities have softer water.
- In Texas it is number 22 of 60 cities; the regional median is 8.6 gpg.
Ranking of the hardest and softest water in the United States →
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 Marble Falls
| Brand | Setting for this water |
|---|---|
| Bosch | H03 |
| Miele | 10 °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 Marble Falls water hard or soft?
It is very hard: 185 mg/L as CaCO₃ (10.8 gpg, 10.4 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Marble Falls 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 Marble Falls water?
10.8 gpg, equal to 10.4 °dH, 18.5 °fH or 185 mg/L calcium carbonate.
What dishwasher salt setting should I use in Marble Falls?
For 185 mg/L (10.4 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Marble Falls?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: City of Marble Falls 2025 Drinking Water Quality Report (2025). Method: figure published by the water supplier. City of Marble Falls 2025 Drinking Water Quality Report · Outdated figure? Tell us