Hard water in Firestone, CO
County estimate from 1,867 water samples in Weld County · July 2026
- CO typical
- 97 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 48k grain
- Data
- County estimate
Water samples from around Firestone put hardness at about 415 mg/L (24.3 gpg), which would be very hard on the USGS scale. Treat this as a rough guide: it is the median of 1,867 samples taken across Weld County, mostly wells and streams, not a test of Firestone's treated tap water. One more reason for caution: EPA lists Firestone's water system as using surface water, which is often softer than the wells behind the county figure.
Firestone sits 318 mg/L above the typical Colorado figure of 97. None of the 10 nearest cities we track has harder water. The range nearby runs from 20 mg/L in Longmont to 202 in Brighton.
What 415 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 415 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 × 24.3 gpg = 5,461 grains a day. A 48,000-grain unit regenerates about every 8 days.
EPA record for Firestone's water system
No health-based violations since 2016
Serves about 27,798 people from surface water.
- Health-based
- 0
- Monitoring or reporting
- 6
- Open now
- 0
EPA lists this system as serving Firestone.
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 Firestone water hard?
Yes. It measures about 415 mg/L (24.3 grains per gallon), which the USGS classes as very hard.
What is the water hardness in Firestone in grains per gallon?
About 24.3 gpg. One grain per gallon equals 17.1 mg/L, so 415 mg/L divided by 17.1 gives 24.3.
What size water softener do I need in Firestone?
For 3 people using 75 gallons each per day, 24.3 gpg works out to about 5,461 grains a day. A 48,000-grain softener covers that with a regeneration about every 8 days.
Has the Firestone water system had EPA violations?
EPA records show no health-based violations for Firestone Town of since 2016. There were also 6 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- Mead36 mg/LSoft
- Longmont20 mg/LSoft
- Berthoud36 mg/LSoft
- Erie33 mg/LSoft
- Johnstown59 mg/LSoft
- Lafayette91 mg/LModerately hard
- Broomfield46 mg/LSoft
- Brighton202 mg/LVery hard
- Thornton98 mg/LModerately hard
- Louisville32 mg/LSoft
Hardness data: TapWaterData US Water Hardness (county estimate, July 4, 2026), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.