Water Quality in Colorado: Complete Guide
Everything homeowners need to know about Colorado tap water - hardness, contaminants, treatment options, and costs.
Quick summary: Colorado has an average water hardness of 99 PPM across 23 cities. 26% of cities have hard water above 120 PPM. PFAS contamination is detected above EPA limits in at least one city. Most households do not need water softening equipment.
Water Hardness Across Colorado
Colorado's water hardness ranges from 40 PPM in Boulder North to 210 PPM in Parker, with a statewide average of 99 PPM. This places Colorado near the national average for water hardness. The national average is approximately 120 PPM.
Most Colorado cities use surface water (rivers, lakes, reservoirs), which generally has lower mineral content than groundwater.
Contaminants of Concern in Colorado
PFAS: The average PFAS level across Colorado cities is 8.0 ppt. Thornton has the highest detected PFAS at 48.77 ppt, above the EPA maximum contaminant level of 4 ppt. Residents should consider a reverse osmosis or NSF P473-certified filter for drinking water.
Lead: Lead contamination comes from plumbing infrastructure, not the water source. Colorado homes built before 1986 are at higher risk due to lead solder. 3 cities show lead levels above 5 ppb.
Do You Need a Water Softener in Colorado?
For most Colorado residents, no. Only 26% of cities have hard water above 120 PPM. However, individual situations vary - check your city page for specific data.
Impact of Hard Water in Colorado
With an average hardness of 99 PPM, most Colorado households do not face significant hard water impact. However, homes with hardness above 120 PPM should evaluate treatment options.