Hard water in Ladue, MO

Tap water hardness
155mg/L
9.0gpg
Hard

Calculated from the utility's calcium and magnesium results · December 2020

MO typical
121 mg/L
Softener for 3 people
24k grain
Data
Calculated from utility data

The water in Ladue carries roughly 155 mg/L of dissolved calcium and magnesium, or 9.0 grains per gallon. That is hard water. TapWaterData worked it out from the calcium and magnesium levels the local utility reports (December 2020).

Ladue on the hardness scale, with nearby cities
060120180240300360+MO typical 121Murphy: 104 mg/LMurphy 104St. Louis: 109 mg/LSt. Louis 109Maryland Heights: 121 mg/LMaryland Heights 121Chesterfield: 121 mg/LChesterfield 121Kirkwood: 130 mg/LKirkwood 130St. Peters: 168 mg/LSt. Peters 168Arnold: 212 mg/LArnold 212Town and Country: 234 mg/LTown and Country 234Ballwin: 242 mg/LBallwin 242Des Peres: 263 mg/LDes Peres 263Ladue 155mg/L as calcium carbonate060120180240300360+MO 121St. Louis: 109 mg/LSt. Louis 109Maryland Heights: 121 mg/LMaryland H. 121Kirkwood: 130 mg/LKirkwood 130Town and Country: 234 mg/LTown and C. 234Ballwin: 242 mg/LBallwin 242Des Peres: 263 mg/LDes Peres 263155 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

At 155 mg/L, Ladue is 34 mg/L above the typical Missouri figure of 121. Of the 10 nearest cities we track, 5 have softer water and 5 have harder. The range nearby runs from 104 mg/L in Murphy to 263 in Des Peres.

What 155 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 155 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.

Softener size for Ladue

3 people × 75 gallons a day × 9.0 gpg = 2,034 grains a day. A 24,000-grain unit regenerates about every 11 days.

Size it for your household

EPA record for Ladue's water system

We could not match Ladue to a community water system in EPA's records. Your water bill or the yearly Consumer Confidence Report names the system and its ID.

Questions

Is Ladue water hard?

Yes. It measures about 155 mg/L (9.0 grains per gallon), which the USGS classes as hard.

What is the water hardness in Ladue in grains per gallon?

About 9.0 gpg. One grain per gallon equals 17.1 mg/L, so 155 mg/L divided by 17.1 gives 9.0.

What size water softener do I need in Ladue?

For 3 people using 75 gallons each per day, 9.0 gpg works out to about 2,034 grains a day. A 24,000-grain softener covers that with a regeneration about every 11 days.

Nearby cities

All 90 cities in Missouri

Hardness data: TapWaterData US Water Hardness (calculated from utility data, December 15, 2020), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.