Johnstown, CO water hardness

Tap water hardness
59mg/L
3.4gpg
Soft

Reported by Johnstown Town of · June 2023

CO typical
97 mg/L
EPA health violations since 2016
2
Data
Utility report

The water in Johnstown carries roughly 59 mg/L of dissolved calcium and magnesium, or 3.4 grains per gallon. That is soft water. The number comes from Johnstown Town of, dated June 2023.

Johnstown on the hardness scale, with nearby cities
060120180240300360+CO typical 97Longmont: 20 mg/LLongmont 20Loveland: 28 mg/LLoveland 28Windsor: 31 mg/LWindsor 31Berthoud: 36 mg/LBerthoud 36Mead: 36 mg/LMead 36Greeley: 37 mg/LGreeley 37Timnath: 41 mg/LTimnath 41Fort Collins: 42 mg/LFort Collins 42Evans: 415 mg/LEvans 415Firestone: 415 mg/LFirestone 415Johnstown 59mg/L as calcium carbonate060120180240300360+CO 97Loveland: 28 mg/LLoveland 28Berthoud: 36 mg/LBerthoud 36Mead: 36 mg/LMead 36Greeley: 37 mg/LGreeley 37Evans: 415 mg/LEvans 415Firestone: 415 mg/LFirestone 41559 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 59 mg/L, Johnstown is 38 mg/L below the typical Colorado figure of 97. Of the 10 nearest cities we track, 8 have softer water and 2 have harder. The range nearby runs from 20 mg/L in Longmont to 415 in Evans.

What 59 mg/L means at home

Soap and shampoo lather with very little product. Kettles and showerheads stay mostly free of white crust.

Some people notice that soap feels slow to rinse off in soft water. That slippery feel is normal and harmless.

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

Nothing, as far as hardness goes. At 59 mg/L a softener would have almost nothing to remove.

Carbon filter

If the water tastes of chlorine, a pitcher or faucet carbon filter takes care of that. It does not change hardness.

EPA record for Johnstown's water system

Johnstown Town of · PWSID CO0162418

2 health-based violations since 2016

Serves about 27,295 people from surface water.

Health-based
2
Monitoring or reporting
36
Open now
0
20162017201820192020202120222023202420252026Surface Water Treatment RuleTotal organic carbon removal'16'18'20'22'24'26Surface Water Treatment RuleTotal organic carbon removal
Each dot is one health-based violation, placed at the start of its compliance period.
Contaminant or ruleViolationsPeriodStatus
Surface Water Treatment Rulefiltration and disinfection12021Resolved
Total organic carbon removaltreatment requirement12020Resolved

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 Johnstown water hard?

No. It measures about 59 mg/L (3.4 grains per gallon), which the USGS classes as soft.

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

About 3.4 gpg. One grain per gallon equals 17.1 mg/L, so 59 mg/L divided by 17.1 gives 3.4.

Has the Johnstown water system had EPA violations?

EPA records show 2 health-based violations for Johnstown Town of since 2016, involving Surface Water Treatment Rule, Total organic carbon removal. There were also 36 monitoring or reporting violations, which are about late or missing tests and notices.

Nearby cities

All 64 cities in Colorado

Hardness data: TapWaterData US Water Hardness (utility report, June 20, 2023), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.