Water hardness in Louisville/Jefferson County Metro Government
7.5 gpg hard
Tap water in Louisville/Jefferson County Metro Government is hard: 7.5 gpg (128 mg/L · 7.2 °dH · 12.8 °fH).
Source: Louisville Water Company 2025 Consumer Confidence Report (2025) · data checked 2026-10-29
Louisville Water Company's 2025 report gives an average hardness of 128 mg/L (7.5 gpg) for its service area. Its supply comes from the Crescent Hill and B.E. Payne plants, and the figure is a single system average with no split by zone. Water is hard, so scale on heaters and glassware is likely.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 7.5 gpg |
|---|---|
| Utility | Louisville Water Company |
How Louisville/Jefferson County Metro Government compares
- Tap water in Louisville/Jefferson County Metro Government is 17 % softer than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 849 of 1372 in the United States (1 = hardest); 38 % of these cities have softer water.
- In Kentucky it is number 7 of 9 cities; the regional median is 7.8 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 Louisville/Jefferson County Metro Government
| Brand | Setting for this water |
|---|---|
| Bosch | H01 |
| Miele | 7 °dH |
| AEG / Electrolux | 2 |
| Beko | 2nd |
| 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 Louisville/Jefferson County Metro Government water hard or soft?
It is hard: 128 mg/L as CaCO₃ (7.5 gpg, 7.2 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Louisville/Jefferson County Metro Government 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 Louisville/Jefferson County Metro Government water?
7.5 gpg, equal to 7.2 °dH, 12.8 °fH or 128 mg/L calcium carbonate.
What dishwasher salt setting should I use in Louisville/Jefferson County Metro Government?
For 128 mg/L (7.2 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Louisville/Jefferson County Metro Government?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: Louisville Water Company 2025 Consumer Confidence Report (2025). Method: figure published by the water supplier. Louisville Water Company 2025 Consumer Confidence Report · Outdated figure? Tell us