Broomfield, CO water hardness

Tap water hardness
46mg/L
2.7gpg
Soft

Reported by Broomfield City and County of · October 2025

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

Tap water in Broomfield has about 46 mg/L of hardness, which is 2.7 grains per gallon. On the USGS scale that counts as soft. The number comes from Broomfield City and County of, dated October 2025.

Broomfield on the hardness scale, with nearby cities
060120180240300360+CO typical 97Louisville: 32 mg/LLouisville 32Erie: 33 mg/LErie 33Lafayette: 91 mg/LLafayette 91Welby: 96 mg/LWelby 96Thornton: 98 mg/LThornton 98Westminster: 100 mg/LWestminster 100Sherrelwood: 100 mg/LSherrelwood 100Northglenn: 118 mg/LNorthglenn 118Federal Heights: 119 mg/LFederal Heights 119Shaw Heights: 127 mg/LShaw Heights 127Broomfield 46mg/L as calcium carbonate060120180240300360+CO 97Louisville: 32 mg/LLouisville 32Erie: 33 mg/LErie 33Lafayette: 91 mg/LLafayette 91Thornton: 98 mg/LThornton 98Westminster: 100 mg/LWestminster 100Northglenn: 118 mg/LNorthglenn 11846 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Broomfield sits 51 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 32 mg/L in Louisville to 127 in Shaw Heights.

What 46 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 46 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 Broomfield's water system

Broomfield City and County of · PWSID CO0107155

2 health-based violations since 2016

Serves about 106,153 people from surface water.

Health-based
2
Monitoring or reporting
1
Open now
0
20162017201820192020202120222023202420252026Lead and Copper Rule'16'18'20'22'24'26Lead and Copper Rule
Each dot is one health-based violation, placed at the start of its compliance period.
Contaminant or ruleViolationsPeriodStatus
Lead and Copper Rulecorrosion control and lead sampling22020–2022Resolved

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 Broomfield water hard?

No. It measures about 46 mg/L (2.7 grains per gallon), which the USGS classes as soft.

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

About 2.7 gpg. One grain per gallon equals 17.1 mg/L, so 46 mg/L divided by 17.1 gives 2.7.

Has the Broomfield water system had EPA violations?

EPA records show 2 health-based violations for Broomfield City and County of since 2016, involving Lead and Copper Rule. There were also 1 monitoring or reporting violation, which are about late or missing tests and notices.

Nearby cities

All 64 cities in Colorado

Hardness data: TapWaterData US Water Hardness (utility report, October 7, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.