Water hardness in Rowlett
8.6 gpg hard
Tap water in Rowlett is hard: 8.6 gpg (148 mg/L · 8.3 °dH · 14.8 °fH).
Source: North Texas Municipal Water District, 2025 Water Quality Report (Wylie Water Treatment Plants data) (2025) · data checked 2026-10-23
Range across supply zones: 96–200 mg/L.
Rowlett buys treated surface water from North Texas Municipal Water District, which draws on reservoirs such as Lavon Lake and Lake Texoma. The computed figure is 148 mg/L CaCO₃ (96–200 mg/L). That is hard water, with 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 | 8.6 gpg |
|---|---|
| Utility | City of Rowlett (treated water purchased from North Texas Municipal Water District) |
How Rowlett compares
- Tap water in Rowlett is 5 % softer than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 723 of 1372 in the United States (1 = hardest); 47 % of these cities have softer water.
- In Texas it is number 29 of 60 cities; the regional median is 8.6 gpg.
- Nearest city with clearly softer water: Mesquite, 17 km away (6.6 gpg).
- Nearest city with clearly harder water: Heath, 11 km away (11.7 gpg).
Ranking of the hardest and softest water in the United States →
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 Rowlett
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 8 °dH |
| AEG / Electrolux | 2 |
| Beko | 3rd |
| 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 Rowlett water hard or soft?
It is hard: 148 mg/L as CaCO₃ (8.6 gpg, 8.3 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Rowlett 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 Rowlett water?
8.6 gpg, equal to 8.3 °dH, 14.8 °fH or 148 mg/L calcium carbonate.
What dishwasher salt setting should I use in Rowlett?
For 148 mg/L (8.3 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Rowlett?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: North Texas Municipal Water District, 2025 Water Quality Report (Wylie Water Treatment Plants data) (2025). Method: computed from supplier's calcium and magnesium. North Texas Municipal Water District, 2025 Water Quality Report (Wylie Water Treatment Plants data) · Outdated figure? Tell us