How hard is the water in Palm City, FL?

Tap water hardness
73mg/L
4.3gpg
Moderately hard

Reported by Martin CO Utilities · September 2025

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

The water in Palm City carries roughly 73 mg/L of dissolved calcium and magnesium, or 4.3 grains per gallon. That is moderately hard water. The number comes from Martin CO Utilities, dated September 2025.

Palm City on the hardness scale, with nearby cities
060120180240300360+FL typical 120The Acreage: 61 mg/LThe Acreage 61River Park: 67 mg/LRiver Park 67Indian River Estates: 67 mg/LIndian River Estates 67White City: 67 mg/LWhite City 67Port St. Lucie: 69 mg/LPort St. Lucie 69Stuart: 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 316Palm City 73mg/L as calcium carbonate060120180240300360+FL 120River Park: 67 mg/LRiver Park 67Indian River Estates: 67 mg/LIndian Riv. 67White City: 67 mg/LWhite City 67Port St. Lucie: 69 mg/LPort St. L. 69Stuart: 73 mg/LStuart 73Port Salerno: 73 mg/LPort Saler. 7373 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Palm City sits 47 mg/L below the typical Florida figure of 120. Of the 10 nearest cities we track, 5 have softer water and 3 have harder. The range nearby runs from 61 mg/L in The Acreage to 316 in Fort Pierce.

What 73 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 Palm City

3 people × 75 gallons a day × 4.3 gpg = 961 grains a day. A 24,000-grain unit regenerates about every 24 days.

Size it for your household

EPA record for Palm City's water system

Martin CO Utilities · PWSID FL4431891

No health-based violations since 2016

Serves about 104,105 people from groundwater.

Health-based
0
Monitoring or reporting
20
Open now
1

TapWaterData ties Palm City to this system. EPA's service-area records do not name Palm City, so check the utility printed on your water bill.

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 Palm City water hard?

Somewhat. It measures about 73 mg/L (4.3 grains per gallon), which the USGS classes as moderately hard.

What is the water hardness in Palm City in grains per gallon?

About 4.3 gpg. One grain per gallon equals 17.1 mg/L, so 73 mg/L divided by 17.1 gives 4.3.

What size water softener do I need in Palm City?

For 3 people using 75 gallons each per day, 4.3 gpg works out to about 961 grains a day. A 24,000-grain softener covers that with a regeneration about every 24 days.

Has the Palm City water system had EPA violations?

EPA records show no health-based violations for Martin CO Utilities since 2016. There were also 20 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, September 29, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.