Hard water in Longwood, FL
Reported by Sanlando (3 WTPS) · October 2025
- FL typical
- 120 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Utility report
The water in Longwood carries roughly 124 mg/L of dissolved calcium and magnesium, or 7.2 grains per gallon. That is hard water. The number comes from Sanlando (3 WTPS), dated October 2025.
Longwood sits close to the typical Florida figure of 120 mg/L. Of the 10 nearest cities we track, 7 have softer water and 2 have harder. The range nearby runs from 94 mg/L in Fern Park to 188 in Forest City.
What 124 mg/L means at home
Expect white crust on faucets and showerheads, plus spots on dishes that come out of the dishwasher.
Kettles collect scale quickly. Water heaters build up sediment at the bottom of the tank, which makes them work harder over time.
Soap and detergent need a little more to lather, and soap scum shows up in the tub.
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 124 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 × 7.2 gpg = 1,627 grains a day. A 24,000-grain unit regenerates about every 14 days.
EPA record for Longwood's water system
No health-based violations since 2016
Serves about 36,953 people from groundwater.
- Health-based
- 0
- Monitoring or reporting
- 3
- Open now
- 0
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 Longwood water hard?
Yes. It measures about 124 mg/L (7.2 grains per gallon), which the USGS classes as hard.
What is the water hardness in Longwood in grains per gallon?
About 7.2 gpg. One grain per gallon equals 17.1 mg/L, so 124 mg/L divided by 17.1 gives 7.2.
What size water softener do I need in Longwood?
For 3 people using 75 gallons each per day, 7.2 gpg works out to about 1,627 grains a day. A 24,000-grain softener covers that with a regeneration about every 14 days.
Has the Longwood water system had EPA violations?
EPA records show no health-based violations for Sanlando (3 WTPS) since 2016. There were also 3 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- Casselberry120 mg/LModerately hard
- Fern Park94 mg/LModerately hard
- Altamonte Springs120 mg/LHard
- Lake Mary122 mg/LHard
- Wekiwa Springs165 mg/LHard
- Winter Springs105 mg/LModerately hard
- Maitland101 mg/LModerately hard
- Heathrow124 mg/LHard
- Forest City188 mg/LVery hard
- Goldenrod120 mg/LModerately hard
Hardness data: TapWaterData US Water Hardness (utility report, October 14, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.