Hard water in Jackson, WY
Reported by Jackson, Town of · October 2025
- WY typical
- 191 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Utility report
The water in Jackson carries roughly 163 mg/L of dissolved calcium and magnesium, or 9.5 grains per gallon. That is hard water. The number comes from Jackson, Town of, dated October 2025.
Jackson sits 28 mg/L below the typical Wyoming figure of 191. Of the 5 nearest cities we track, 2 have softer water and 3 have harder. The range nearby runs from 27 mg/L in Sheridan to 926 in Gillette.
What 163 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 163 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 × 9.5 gpg = 2,144 grains a day. A 24,000-grain unit regenerates about every 11 days.
EPA record for Jackson's water system
No health-based violations since 2016
Serves about 24,760 people from groundwater.
- Health-based
- 0
- Monitoring or reporting
- 276
- Open now
- 1
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 Jackson water hard?
Yes. It measures about 163 mg/L (9.5 grains per gallon), which the USGS classes as hard.
What is the water hardness in Jackson in grains per gallon?
About 9.5 gpg. One grain per gallon equals 17.1 mg/L, so 163 mg/L divided by 17.1 gives 9.5.
What size water softener do I need in Jackson?
For 3 people using 75 gallons each per day, 9.5 gpg works out to about 2,144 grains a day. A 24,000-grain softener covers that with a regeneration about every 11 days.
Has the Jackson water system had EPA violations?
EPA records show no health-based violations for Jackson, Town of since 2016. There were also 276 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- Rock Springs210 mg/LVery hard
- Sheridan27 mg/LSoft
- Casper327 mg/LVery hard
- Gillette926 mg/LVery hard
- Cheyenne49 mg/LSoft
Hardness data: TapWaterData US Water Hardness (utility report, October 15, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.