How hard is the water in Port St. Lucie, FL?

Tap water hardness
69mg/L
4.0gpg
Moderately hard

Reported by Port ST Lucie Utilities · October 2025

FL typical
120 mg/L
EPA health violations since 2016
0
Softener for 3 people
24k grain
Data
Utility report

Port St. Lucie water measures 69 mg/L (4.0 gpg) of hardness, moderately hard by USGS standards. The number comes from Port ST Lucie Utilities, dated October 2025.

Port St. Lucie on the hardness scale, with nearby cities
060120180240300360+FL typical 120Vero Beach: 64 mg/LVero Beach 64River Park: 67 mg/LRiver Park 67White City: 67 mg/LWhite City 67Indian River Estates: 67 mg/LIndian River Estates 67Palm City: 73 mg/LPalm City 73Stuart: 73 mg/LStuart 73Port Salerno: 73 mg/LPort Salerno 73Palm Beach Gardens: 75 mg/LPalm Beach Gardens 75Jupiter: 93 mg/LJupiter 93Fort Pierce: 316 mg/LFort Pierce 316Port St. Lucie 69mg/L as calcium carbonate060120180240300360+FL 120River Park: 67 mg/LRiver Park 67White City: 67 mg/LWhite City 67Indian River Estates: 67 mg/LIndian Riv. 67Palm City: 73 mg/LPalm City 73Stuart: 73 mg/LStuart 73Fort Pierce: 316 mg/LFort Pierce 31669 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 69 mg/L, Port St. Lucie is 51 mg/L below the typical Florida figure of 120. Of the 10 nearest cities we track, 4 have softer water and 6 have harder. The range nearby runs from 64 mg/L in Vero Beach to 316 in Fort Pierce.

What 69 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 Port St. Lucie

3 people × 75 gallons a day × 4.0 gpg = 902 grains a day. A 24,000-grain unit regenerates about every 26 days.

Size it for your household

EPA record for Port St. Lucie's water system

Port ST Lucie Utilities · PWSID FL4560954

No health-based violations since 2016

Serves about 224,485 people from groundwater.

Health-based
0
Monitoring or reporting
39
Open now
1

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 Port St. Lucie water hard?

Somewhat. It measures about 69 mg/L (4.0 grains per gallon), which the USGS classes as moderately hard.

What is the water hardness in Port St. Lucie in grains per gallon?

About 4.0 gpg. One grain per gallon equals 17.1 mg/L, so 69 mg/L divided by 17.1 gives 4.0.

What size water softener do I need in Port St. Lucie?

For 3 people using 75 gallons each per day, 4.0 gpg works out to about 902 grains a day. A 24,000-grain softener covers that with a regeneration about every 26 days.

Has the Port St. Lucie water system had EPA violations?

EPA records show no health-based violations for Port ST Lucie Utilities since 2016. There were also 39 monitoring or reporting violations, which are about late or missing tests and notices.

Nearby cities

All 214 cities in Florida

Hardness data: TapWaterData US Water Hardness (utility report, October 6, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.