Water hardness in Franklin
9.8 gpg hard
Tap water in Franklin is hard: 9.8 gpg (167 mg/L · 9.4 °dH · 16.7 °fH).
Source: City of Franklin Water Management Department 2023 Water Quality Report (2023) · data checked 2026-10-19
Range across supply zones: 87–249 mg/L.
The City of Franklin's 2023 water quality report gives a hardness of 167 mg/L (9.8 gpg), with a range of 87 to 249 mg/L (5.1 to 14.5 gpg). That is hard water, and the wide range means the figure at your tap shifts. Expect scale on kettles and water heaters. A newer city report may give different values.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 9.8 gpg |
|---|---|
| Utility | City of Franklin Water Management Department |
How Franklin compares
- Tap water in Franklin is 8 % harder than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 638 of 1372 in the United States (1 = hardest); 53 % of these cities have softer water.
- In Tennessee it is number 1 of 9 cities; the regional median is 3.8 gpg.
- Nearest city with clearly softer water: Spring Hill, 20 km away (7.2 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 Franklin
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 9 °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 Franklin water hard or soft?
It is hard: 167 mg/L as CaCO₃ (9.8 gpg, 9.4 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Franklin 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 Franklin water?
9.8 gpg, equal to 9.4 °dH, 16.7 °fH or 167 mg/L calcium carbonate.
What dishwasher salt setting should I use in Franklin?
For 167 mg/L (9.4 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Franklin?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: City of Franklin Water Management Department 2023 Water Quality Report (2023). Method: figure published by the water supplier. City of Franklin Water Management Department 2023 Water Quality Report · Outdated figure? Tell us