Erie, CO water hardness

Tap water hardness
33mg/L
1.9gpg
Soft

Reported by Erie Town of · June 2025

CO typical
97 mg/L
EPA health violations since 2016
0
Data
Utility report

The water in Erie carries roughly 33 mg/L of dissolved calcium and magnesium, or 1.9 grains per gallon. That is soft water. The number comes from Erie Town of, dated June 2025.

Erie on the hardness scale, with nearby cities
060120180240300360+CO typical 97Longmont: 20 mg/LLongmont 20Louisville: 32 mg/LLouisville 32Boulder: 41 mg/LBoulder 41Broomfield: 46 mg/LBroomfield 46Lafayette: 91 mg/LLafayette 91Thornton: 98 mg/LThornton 98Westminster: 100 mg/LWestminster 100Northglenn: 118 mg/LNorthglenn 118Federal Heights: 119 mg/LFederal Heights 119Firestone: 415 mg/LFirestone 415Erie 33mg/L as calcium carbonate060120180240300360+CO 97Longmont: 20 mg/LLongmont 20Louisville: 32 mg/LLouisville 32Broomfield: 46 mg/LBroomfield 46Lafayette: 91 mg/LLafayette 91Northglenn: 118 mg/LNorthglenn 118Firestone: 415 mg/LFirestone 41533 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 33 mg/L, Erie is 64 mg/L below the typical Colorado figure of 97. Of the 10 nearest cities we track, 2 have softer water and 8 have harder. The range nearby runs from 20 mg/L in Longmont to 415 in Firestone.

What 33 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 33 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 Erie's water system

Erie Town of · PWSID CO0162255

No health-based violations since 2016

Serves about 47,444 people from surface water.

Health-based
0
Monitoring or reporting
33
Open now
0

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 Erie water hard?

No. It measures about 33 mg/L (1.9 grains per gallon), which the USGS classes as soft.

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

About 1.9 gpg. One grain per gallon equals 17.1 mg/L, so 33 mg/L divided by 17.1 gives 1.9.

Has the Erie water system had EPA violations?

EPA records show no health-based violations for Erie Town of since 2016. There were also 33 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 2, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.