Hard water in Terrell, TX
County estimate from 242 water samples in Kaufman 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 Terrell put hardness at about 136 mg/L (7.9 gpg), which would be hard on the USGS scale. Treat this as a rough guide: it is the median of 242 samples taken across Kaufman County, mostly wells and streams, not a test of Terrell's treated tap water. One more reason for caution: EPA lists Terrell's water system as using surface water, which is often softer than the wells behind the county figure.
Terrell sits 24 mg/L above the typical Texas figure of 112. Of the 10 nearest cities we track, 5 have softer water and 5 have harder. The range nearby runs from 92 mg/L in Forney to 164 in Seagoville.
What 136 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 136 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 × 7.9 gpg = 1,782 grains a day. A 24,000-grain unit regenerates about every 13 days.
EPA record for Terrell's water system
No health-based violations since 2016
Serves about 18,432 people from surface water.
- Health-based
- 0
- Monitoring or reporting
- 6
- Open now
- 0
EPA lists this system as serving Terrell.
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 Terrell water hard?
Yes. It measures about 136 mg/L (7.9 grains per gallon), which the USGS classes as hard.
What is the water hardness in Terrell in grains per gallon?
About 7.9 gpg. One grain per gallon equals 17.1 mg/L, so 136 mg/L divided by 17.1 gives 7.9.
What size water softener do I need in Terrell?
For 3 people using 75 gallons each per day, 7.9 gpg works out to about 1,782 grains a day. A 24,000-grain softener covers that with a regeneration about every 13 days.
Has the Terrell water system had EPA violations?
EPA records show no health-based violations for City of Terrell since 2016. There were also 6 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- Forney92 mg/LModerately hard
- Seagoville164 mg/LHard
- Rockwall116 mg/LModerately hard
- Sunnyvale140 mg/LHard
- Fate126 mg/LHard
- Mesquite142 mg/LHard
- Royse City116 mg/LModerately hard
- Balch Springs164 mg/LHard
- Rowlett161 mg/LHard
- Lavon126 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.