How hard is the water in Melissa, TX?
County estimate from 217 water samples in Collin County · July 2026
- TX typical
- 112 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- County estimate
Water samples from around Melissa put hardness at about 111 mg/L (6.5 gpg), which would be moderately hard on the USGS scale. Treat this as a rough guide: it is the median of 217 samples taken across Collin County, mostly wells and streams, not a test of Melissa's treated tap water. One more reason for caution: EPA lists Melissa's water system as using surface water, which is often softer than the wells behind the county figure.
At 111 mg/L, Melissa is close to the typical Texas figure of 112 mg/L. Of the 10 nearest cities we track, 6 have softer water and 4 have harder. The range nearby runs from 18 mg/L in Van Alstyne to 149 in Frisco.
What 111 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.
3 people × 75 gallons a day × 6.5 gpg = 1,460 grains a day. A 24,000-grain unit regenerates about every 16 days.
EPA record for Melissa's water system
No health-based violations since 2016
Serves about 26,234 people from surface water.
- Health-based
- 0
- Monitoring or reporting
- 1
- Open now
- 0
EPA lists this system as serving Melissa.
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 Melissa water hard?
Somewhat. It measures about 111 mg/L (6.5 grains per gallon), which the USGS classes as moderately hard.
What is the water hardness in Melissa in grains per gallon?
About 6.5 gpg. One grain per gallon equals 17.1 mg/L, so 111 mg/L divided by 17.1 gives 6.5.
What size water softener do I need in Melissa?
For 3 people using 75 gallons each per day, 6.5 gpg works out to about 1,460 grains a day. A 24,000-grain softener covers that with a regeneration about every 16 days.
Has the Melissa water system had EPA violations?
EPA records show no health-based violations for City of Melissa since 2016. There were also 1 monitoring or reporting violation, which are about late or missing tests and notices.
Nearby cities
- Anna62 mg/LModerately hard
- Princeton116 mg/LModerately hard
- McKinney132 mg/LHard
- Van Alstyne18 mg/LSoft
- Fairview90 mg/LModerately hard
- Lucas110 mg/LModerately hard
- Celina40 mg/LSoft
- Allen109 mg/LModerately hard
- Farmersville134 mg/LHard
- Frisco149 mg/LHard
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.