Hard water in Chubbuck, ID

Tap water hardness
340mg/L
19.9gpg
Very hard

Reported by Chubbuck City of · May 2022

ID typical
118 mg/L
EPA health violations since 2016
0
Softener for 3 people
32k grain
Data
Utility report

Tap water in Chubbuck has about 340 mg/L of hardness, which is 19.9 grains per gallon. On the USGS scale that counts as very hard. The number comes from Chubbuck City of, dated May 2022.

Chubbuck on the hardness scale, with nearby cities
060120180240300360+ID typical 118Rexburg: 72 mg/LRexburg 72Meridian: 86 mg/LMeridian 86Boise City: 90 mg/LBoise City 90Garden City: 90 mg/LGarden City 90Kuna: 90 mg/LKuna 90Eagle: 90 mg/LEagle 90Blackfoot: 119 mg/LBlackfoot 119Idaho Falls: 173 mg/LIdaho Falls 173Pocatello: 351 mg/LPocatello 351Twin Falls: 400 mg/LTwin Falls 400Chubbuck 340mg/L as calcium carbonate060120180240300360+ID 118Rexburg: 72 mg/LRexburg 72Boise City: 90 mg/LBoise City 90Blackfoot: 119 mg/LBlackfoot 119Idaho Falls: 173 mg/LIdaho Falls 173Pocatello: 351 mg/LPocatello 351Twin Falls: 400 mg/LTwin Falls 400340 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

At 340 mg/L, Chubbuck is 222 mg/L above the typical Idaho figure of 118. Of the 10 nearest cities we track, 8 have softer water and 2 have harder. The range nearby runs from 72 mg/L in Rexburg to 400 in Twin Falls.

What 340 mg/L means at home

Scale forms fast here. Kettles and coffee makers need regular descaling, and showerheads clog unless you clean them.

Tank water heaters collect mineral sediment that insulates the water from the burner, so flushing the tank matters more than usual.

Dishes and glass shower doors spot easily. Soap scum and a dull film on hair or laundry are common complaints.

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 340 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.

Softener size for Chubbuck

3 people × 75 gallons a day × 19.9 gpg = 4,473 grains a day. A 32,000-grain unit regenerates about every 7 days.

Size it for your household

EPA record for Chubbuck's water system

Chubbuck City of · PWSID ID6030008

No health-based violations since 2016

Serves about 15,842 people from groundwater.

Health-based
0
Monitoring or reporting
1
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 Chubbuck water hard?

Yes. It measures about 340 mg/L (19.9 grains per gallon), which the USGS classes as very hard.

What is the water hardness in Chubbuck in grains per gallon?

About 19.9 gpg. One grain per gallon equals 17.1 mg/L, so 340 mg/L divided by 17.1 gives 19.9.

What size water softener do I need in Chubbuck?

For 3 people using 75 gallons each per day, 19.9 gpg works out to about 4,473 grains a day. A 32,000-grain softener covers that with a regeneration about every 7 days.

Has the Chubbuck water system had EPA violations?

EPA records show no health-based violations for Chubbuck City of since 2016. There were also 1 monitoring or reporting violation, which are about late or missing tests and notices.

Nearby cities

All 21 cities in Idaho

Hardness data: TapWaterData US Water Hardness (utility report, May 17, 2022), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.