Water hardness in Frisco, TX
8.6 gpg hard
Tap water in Frisco, TX is hard: 8.6 gpg (148 mg/L · 8.3 °dH · 14.8 °fH).
Source: City of Frisco 2025 Water Quality Report (NTMWD table) (2025) · data checked 2026-10-19
Range across supply zones: 96–200 mg/L.
Frisco buys treated water from the North Texas Municipal Water District and the city's 2025 report ties it to the Wylie plant. The report lists a range of 96 to 200 mg/L as CaCO3 (5.6 to 11.7 gpg); the 200 is the high end, not an average, so the page uses the midpoint of the range. This is hard water at the upper end, and scale on heaters and glassware is common.
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 Frisco Water Services (treated water purchased from NTMWD) |
How Frisco, TX compares
- Tap water in Frisco, TX 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: Grapevine, 34 km away (6.8 gpg).
- Nearest city with clearly harder water: Heath, 47 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 Frisco, TX
| 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 Frisco, TX 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 Frisco, TX 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 Frisco, TX 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 Frisco, TX?
For 148 mg/L (8.3 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Frisco, TX?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: City of Frisco 2025 Water Quality Report (NTMWD table) (2025). Method: computed from supplier's calcium and magnesium. City of Frisco 2025 Water Quality Report (NTMWD table) · Outdated figure? Tell us