Hard water in Coffeyville, KS
Reported by Coffeyville, City of · January 2024
- KS typical
- 138 mg/L
- EPA health violations since 2016
- 1
- Softener for 3 people
- 24k grain
- Data
- Utility report
The water in Coffeyville carries roughly 180 mg/L of dissolved calcium and magnesium, or 10.5 grains per gallon. That is hard water. The number comes from Coffeyville, City of, dated January 2024.
Coffeyville sits 42 mg/L above the typical Kansas figure of 138. Of the 10 nearest cities we track, 8 have softer water and 2 have harder. The range nearby runs from 76 mg/L in Emporia to 225 in Haysville.
What 180 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 180 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 × 10.5 gpg = 2,365 grains a day. A 24,000-grain unit regenerates about every 10 days.
EPA record for Coffeyville's water system
1 health-based violation since 2016
Serves about 8,847 people from surface water.
- Health-based
- 1
- Monitoring or reporting
- 0
- Open now
- 0
| Contaminant or rule | Violations | Period | Status |
|---|---|---|---|
| Surface Water Treatment Rulefiltration and disinfection | 1 | 2024 | Resolved |
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 Coffeyville water hard?
Yes. It measures about 180 mg/L (10.5 grains per gallon), which the USGS classes as hard.
What is the water hardness in Coffeyville in grains per gallon?
About 10.5 gpg. One grain per gallon equals 17.1 mg/L, so 180 mg/L divided by 17.1 gives 10.5.
What size water softener do I need in Coffeyville?
For 3 people using 75 gallons each per day, 10.5 gpg works out to about 2,365 grains a day. A 24,000-grain softener covers that with a regeneration about every 10 days.
Has the Coffeyville water system had EPA violations?
EPA records show 1 health-based violation for Coffeyville, City of since 2016, involving Surface Water Treatment Rule.
Nearby cities
- Parsons129 mg/LHard
- Pittsburg131 mg/LHard
- Winfield136 mg/LHard
- Arkansas City206 mg/LVery hard
- Augusta120 mg/LModerately hard
- El Dorado117 mg/LModerately hard
- Mulvane128 mg/LHard
- Derby133 mg/LHard
- Emporia76 mg/LModerately hard
- Haysville225 mg/LVery hard
Hardness data: TapWaterData US Water Hardness (utility report, January 10, 2024), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.