Hard water in Oak Grove, MO
Calculated from the utility's calcium and magnesium results · December 2020
- MO typical
- 121 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Calculated from utility data
Oak Grove water measures 176 mg/L (10.3 gpg) of hardness, hard by USGS standards. TapWaterData worked it out from the calcium and magnesium levels the local utility reports (December 2020).
At 176 mg/L, Oak Grove is 55 mg/L above the typical Missouri figure of 121. Of the 10 nearest cities we track, 6 have softer water and 4 have harder. The range nearby runs from 97 mg/L in Lee's Summit to 310 in Blue Springs.
What 176 mg/L means at home
Expect white crust on faucets and showerheads, plus spots on dishes that come out of the dishwasher.
Kettles collect scale quickly. Water heaters build up sediment at the bottom of the tank, which makes them work harder over time.
Soap and detergent need a little more to lather, and soap scum shows up in the tub.
Hardness is not a health problem, and EPA sets no limit for it. It is a matter of scale and soap.
What to do about it
At 176 mg/L most of the trouble is scale, and only a few things deal with it.
Ion-exchange water softener
The standard whole-house fix. It swaps calcium and magnesium for sodium or potassium and needs salt plus a drain. Size it with the calculator below.
Salt-free conditioner
No salt and no drain line. It changes how minerals form scale instead of removing them, so water still tests hard.
Reverse osmosis or carbon filter
Under-sink reverse osmosis removes minerals from drinking water only. Plain carbon filters improve taste but do not soften.
3 people × 75 gallons a day × 10.3 gpg = 2,311 grains a day. A 24,000-grain unit regenerates about every 10 days.
EPA record for Oak Grove's water system
No health-based violations since 2016
Serves about 9,200 people from groundwater.
- Health-based
- 0
- Monitoring or reporting
- 1
- Open now
- 1
EPA lists this system as serving Oak Grove.
Health-based means a contaminant above its legal limit or a missed treatment step. Monitoring and reporting violations are late or missing tests and notices. Source: EPA ECHO, 2026Q3 export, violations with periods starting 2016 or later. Full EPA record.
Questions
Is Oak Grove water hard?
Yes. It measures about 176 mg/L (10.3 grains per gallon), which the USGS classes as hard.
What is the water hardness in Oak Grove in grains per gallon?
About 10.3 gpg. One grain per gallon equals 17.1 mg/L, so 176 mg/L divided by 17.1 gives 10.3.
What size water softener do I need in Oak Grove?
For 3 people using 75 gallons each per day, 10.3 gpg works out to about 2,311 grains a day. A 24,000-grain softener covers that with a regeneration about every 10 days.
Has the Oak Grove water system had EPA violations?
EPA records show no health-based violations for Oak Grove PWS since 2016. There were also 1 monitoring or reporting violation, which are about late or missing tests and notices.
Nearby cities
- Blue Springs310 mg/LVery hard
- Independence118 mg/LModerately hard
- Lee's Summit97 mg/LModerately hard
- Raytown116 mg/LModerately hard
- Richmond190 mg/LVery hard
- Liberty162 mg/LHard
- Raymore219 mg/LVery hard
- Grandview310 mg/LVery hard
- Excelsior Springs154 mg/LHard
- Kansas City116 mg/LModerately hard
Hardness data: TapWaterData US Water Hardness (calculated from utility data, December 7, 2020), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.