Water hardness in Owensboro
10.2 gpg hard
Tap water in Owensboro is hard: 10.2 gpg (175 mg/L · 9.8 °dH · 17.5 °fH).
Source: Owensboro Municipal Utilities, Water Quality Report 2022 (2022) · data checked 2026-10-23
Range across supply zones: 150–200 mg/L.
This figure is over 3 years old; hardness may have changed.
Owensboro Municipal Utilities pumps groundwater from the Ohio River alluvium, a sand-and-gravel aquifer that fills a bedrock valley carved by the river, and softens it at the Cavin treatment plant. Even after softening the water measures 175 mg/L CaCO₃ (150–200 mg/L), which is hard. Some scale builds up in kettles and heaters. The figure dates from 2022 and may have changed.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 10.2 gpg |
|---|---|
| Utility | Owensboro Municipal Utilities (OMU) |
How Owensboro compares
- Tap water in Owensboro is 13 % harder than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 610 of 1372 in the United States (1 = hardest); 55 % of these cities have softer water.
- In Kentucky it is number 1 of 9 cities; the regional median is 7.8 gpg.
- Nearest city with clearly softer water: Evansville, 46 km away (7 gpg).
- Nearest city with clearly harder water: Newburgh, 33 km away (15.6 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 Owensboro
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| 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 Owensboro water hard or soft?
It is hard: 175 mg/L as CaCO₃ (10.2 gpg, 9.8 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Owensboro 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 Owensboro water?
10.2 gpg, equal to 9.8 °dH, 17.5 °fH or 175 mg/L calcium carbonate.
What dishwasher salt setting should I use in Owensboro?
For 175 mg/L (9.8 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Owensboro?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: Owensboro Municipal Utilities, Water Quality Report 2022 (2022). Method: computed from supplier's calcium and magnesium. Owensboro Municipal Utilities, Water Quality Report 2022 · Outdated figure? Tell us