Hard water in North Miami Beach, FL
County estimate from 4,747 water samples in Miami-Dade County · July 2026
- FL typical
- 120 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- County estimate
Water samples from around North Miami Beach put hardness at about 212 mg/L (12.4 gpg), which would be very hard on the USGS scale. Treat this as a rough guide: it is the median of 4,747 samples taken across Miami-Dade County, mostly wells and streams, not a test of North Miami Beach's treated tap water.
At 212 mg/L, North Miami Beach is 92 mg/L above the typical Florida figure of 120. Of the 10 nearest cities we track, 7 have softer water and 1 has harder. The range nearby runs from 28 mg/L in Country Club to 248 in Miami.
What 212 mg/L means at home
Scale forms fast here. Kettles and coffee makers need regular descaling, and showerheads clog unless you clean them.
Tank water heaters collect mineral sediment that insulates the water from the burner, so flushing the tank matters more than usual.
Dishes and glass shower doors spot easily. Soap scum and a dull film on hair or laundry are common complaints.
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 212 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.
3 people × 75 gallons a day × 12.4 gpg = 2,790 grains a day. A 24,000-grain unit regenerates about every 8 days.
EPA record for North Miami Beach's water system
No health-based violations since 2016
Serves about 180,000 people from groundwater.
- Health-based
- 0
- Monitoring or reporting
- 9
- Open now
- 1
EPA lists this system as serving North Miami Beach.
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 Beach water hard?
Yes. It measures about 212 mg/L (12.4 grains per gallon), which the USGS classes as very hard.
What is the water hardness in North Miami Beach in grains per gallon?
About 12.4 gpg. One grain per gallon equals 17.1 mg/L, so 212 mg/L divided by 17.1 gives 12.4.
What size water softener do I need in North Miami Beach?
For 3 people using 75 gallons each per day, 12.4 gpg works out to about 2,790 grains a day. A 24,000-grain softener covers that with a regeneration about every 8 days.
Has the North Miami Beach water system had EPA violations?
EPA records show no health-based violations for North Miami Beach since 2016. There were also 9 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- North Miami89 mg/LModerately hard
- Surfside92 mg/LModerately hard
- Miami Gardens212 mg/LVery hard
- Hollywood51 mg/LSoft
- Miami Beach35 mg/LSoft
- Dania Beach51 mg/LSoft
- Country Club28 mg/LSoft
- Hialeah212 mg/LVery hard
- Palm Springs North28 mg/LSoft
- Miami248 mg/LVery hard
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.