Aquatell

Colorado

The 16 hardness figures we’ve verified run from 1.2 to 16 grains per gallon, with a median of 6.8; 38% are hard or very hard.

How the 16 figures spread across the bands

  • Soft 0
  • Slightly hard 3
  • Moderately hard 7
  • Hard 3
  • Very hard 3
Hardness
6.8 gpg medianAverage 7.0 gpg (120 ppm), from 1.2 to 16. Each published figure counts once in the average, median and spread; a figure published as a range is shown as its range and isn't averaged.
Coverage
17 places17 listings as published
Disinfectant
2 of 5use chloramine; 3 use chlorine

Every place we have

Sources are each city’s water quality report or its utility. Gather the listings up by place or by the water system that serves them, or see every listing as published; open a group to see what’s in it.

17 places

On the scaleDisinfectantSourcesAsk Aqua
Commerce City
No source linked
  • The page it came from links no primary source for this figure.
 16 gpg276 ppm, very hard –
Centennial
No source linked
  • The page it came from links no primary source for this figure.
 12 gpg205 ppm, very hard –
Thornton
No source linked
  • The page it came from links no primary source for this figure.
 12 gpg196 ppm, very hard –
Arvada
No source linked
  • The page it came from links no primary source for this figure.
 9.0 gpg158 ppm, hard –
Castle Rock
No source linked
  • The page it came from links no primary source for this figure.
 8.9 gpg152 ppm, hard –
Aurora
2 notes
  • The page it came from links no primary source for this figure.
  • Another Aquatell page gives chloramine; this table's figure is kept.
 7.8 gpg132 ppm, hard Chlorine Disinfectant
Pueblo
No source linked
  • The page it came from links no primary source for this figure.
 6.9 gpg117 ppm, moderately hard –
Westminster
No source linked
  • The page it came from links no primary source for this figure.
 6.9 gpg118 ppm, moderately hard –
Colorado Springs
No source linked
  • The page it came from links no primary source for this figure.
 6.6 gpg113 ppm, moderately hard Chlorine Disinfectant
Fort Collins
No source linked
  • The page it came from links no primary source for this figure.
 6.0 gpg111 ppm, moderately hard Chlorine Disinfectant
Denver
No source linked
  • The page it came from links no primary source for this figure.
 5.8 gpg98 ppm, moderately hard Chloramine Disinfectant
Durango
No source linked
  • The page it came from links no primary source for this figure.
 5.0 gpg89 ppm, moderately hard –
Broomfield
No source linked
  • The page it came from links no primary source for this figure.
 4.9 gpg83 ppm, moderately hard –
Boulder
No source linked
  • The page it came from links no primary source for this figure.
 2.4 gpg41 ppm, slightly hard –
Loveland
No source linked
  • The page it came from links no primary source for this figure.
 1.3 gpg22 ppm, slightly hard –
Longmont
No source linked
  • The page it came from links no primary source for this figure.
 1.2 gpg20 ppm, slightly hard –
Lakewood
 – Chloramine Disinfectant

Missing your city? Aquatell researches cities on request from the utility’s own reports, usually within a week. A note on a figure says what we found when we checked it: units that didn’t agree, another page with a different figure, a range.

What to do about it

Hard water

Above about 3.5 grains per gallon, scale builds in water heaters, fixtures and appliances. A softener sized for your hardness and household removes it for the whole house.

Water softenersSizing a softener

Chlorine or chloramine

Standard carbon removes chlorine’s taste and smell. Chloramine lasts longer in the pipes and needs catalytic carbon to remove it.

Carbon and chloramine filters

Not sure what you need?

Aqua knows these figures and Aquatell’s treatment charts, and can size a system for your home.

Softeners for Colorado’s water

See them all