How hard is the water in Prairieville, LA?

Tap water hardness
66mg/L
3.9gpg
Moderately hardCounty estimate

County estimate from 171 water samples in Ascension Parish · July 2026

LA typical
102 mg/L
Softener for 3 people
24k grain
Data
County estimate

Water samples from around Prairieville put hardness at about 66 mg/L (3.9 gpg), which would be moderately hard on the USGS scale. Treat this as a rough guide: it is the median of 171 samples taken across Ascension Parish, mostly wells and streams, not a test of Prairieville's treated tap water.

Prairieville on the hardness scale, with nearby cities
060120180240300360+LA typical 102Covington: 4 mg/LCovington 4Port Allen: 19 mg/LPort Allen 19Baton Rouge: 23 mg/LBaton Rouge 23Hammond: 27 mg/LHammond 27Mandeville: 48 mg/LMandeville 48Zachary: 55 mg/LZachary 55Metairie: 135 mg/LMetairie 135Elmwood: 154 mg/LElmwood 154Jefferson: 154 mg/LJefferson 154Houma: 360 mg/LHouma 360Prairieville 66mg/L as calcium carbonate060120180240300360+LA 102Port Allen: 19 mg/LPort Allen 19Baton Rouge: 23 mg/LBaton Rouge 23Hammond: 27 mg/LHammond 27Mandeville: 48 mg/LMandeville 48Zachary: 55 mg/LZachary 55Metairie: 135 mg/LMetairie 13566 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Prairieville sits 36 mg/L below the typical Louisiana figure of 102. Of the 10 nearest cities we track, 6 have softer water and 4 have harder. The range nearby runs from 4 mg/L in Covington to 360 in Houma.

What 66 mg/L means at home

You may see faint white spots on glasses and shower doors after the water dries.

Scale builds up slowly. A kettle or coffee maker needs descaling now and then, maybe every few months.

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

Optional. Plenty of households at this level live with it and descale the kettle now and then.

Water softener

Worth a look if spots on glass bother you, or if your tankless water heater manual asks for softer water.

Carbon filter

Improves taste and removes chlorine. It leaves calcium and magnesium in place.

Softener size for Prairieville

3 people × 75 gallons a day × 3.9 gpg = 871 grains a day. A 24,000-grain unit regenerates about every 27 days.

Size it for your household

EPA record for Prairieville's water system

We could not match Prairieville 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 Prairieville water hard?

Somewhat. It measures about 66 mg/L (3.9 grains per gallon), which the USGS classes as moderately hard.

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

About 3.9 gpg. One grain per gallon equals 17.1 mg/L, so 66 mg/L divided by 17.1 gives 3.9.

What size water softener do I need in Prairieville?

For 3 people using 75 gallons each per day, 3.9 gpg works out to about 871 grains a day. A 24,000-grain softener covers that with a regeneration about every 27 days.

Nearby cities

All 32 cities in Louisiana

Hardness data: TapWaterData US Water Hardness (county estimate, July 4, 2026), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.