How hard is the water in North Miami, FL?

Tap water hardness

89mg/L

5.2gpg

Moderately hard

Reported by North Miami, City of · July 2024

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

North Miami water measures 89 mg/L (5.2 gpg) of hardness, moderately hard by USGS standards. The number comes from North Miami, City of, dated July 2024.

North Miami on the hardness scale, with nearby cities

Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

At 89 mg/L, North Miami is 31 mg/L below the typical Florida figure of 120. Of the 10 nearest cities we track, 5 have softer water and 5 have harder. The range nearby runs from 28 mg/L in Country Club to 248 in Miami.

What 89 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 North Miami

3 people × 75 gallons a day × 5.2 gpg = 1,174 grains a day. A 24,000-grain unit regenerates about every 20 days.

Size it for your household

EPA record for North Miami's water system

North Miami, City of · PWSID FL4130977

No health-based violations since 2016

Serves about 89,349 people from groundwater.

Health-based: 0
Monitoring or reporting: 18
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 North Miami water hard?

Somewhat. It measures about 89 mg/L (5.2 grains per gallon), which the USGS classes as moderately hard.

What is the water hardness in North Miami in grains per gallon?

About 5.2 gpg. One grain per gallon equals 17.1 mg/L, so 89 mg/L divided by 17.1 gives 5.2.

What size water softener do I need in North Miami?

For 3 people using 75 gallons each per day, 5.2 gpg works out to about 1,174 grains a day. A 24,000-grain softener covers that with a regeneration about every 20 days.

Has the North Miami water system had EPA violations?

EPA records show no health-based violations for North Miami, City of since 2016. There were also 18 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, July 19, 2024), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.