Water hardness in Overland Park
7.9 gpg hard
Tap water in Overland Park is hard: 7.9 gpg (135 mg/L · 7.6 °dH · 13.5 °fH).
Source: WaterOne 2026 Consumer Confidence Report (2025) · data checked 2026-10-19
Range across supply zones: 110–157 mg/L.
WaterOne's 2026 report, covering 2025 data, gives total hardness of 135 mg/L (7.9 gpg) with a range of 110 to 157 mg/L. WaterOne serves most of Overland Park, but we have not checked every address against its service map. The water is hard, and scale is likely 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 | 7.9 gpg |
|---|---|
| Utility | WaterOne (No. 1 Water District of Johnson County) |
How Overland Park compares
- Tap water in Overland Park is 13 % softer than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 800 of 1372 in the United States (1 = hardest); 41 % of these cities have softer water.
- In Kansas it is number 10 of 17 cities; the regional median is 8.4 gpg.
- Nearest city with clearly harder water: Kansas City, 15 km away (16.4 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 Overland Park
| Brand | Setting for this water |
|---|---|
| Bosch | H01 |
| Miele | 8 °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 Overland Park water hard or soft?
It is hard: 135 mg/L as CaCO₃ (7.9 gpg, 7.6 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Overland Park 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 Overland Park water?
7.9 gpg, equal to 7.6 °dH, 13.5 °fH or 135 mg/L calcium carbonate.
What dishwasher salt setting should I use in Overland Park?
For 135 mg/L (7.6 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Overland Park?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: WaterOne 2026 Consumer Confidence Report (2025). Method: figure published by the water supplier. WaterOne 2026 Consumer Confidence Report · Outdated figure? Tell us