Tap water quality in Denver, Colorado
Denver's water systems logged 1 health-based EPA violation in 2021–2026, most recently in 2021 — a modest record, with surface water treatment rule the issue found. For context, Colorado's systems average 2.2 health-based violations each.
Averages describe states, not your faucet. A certified home water test screens for lead, nitrates, bacteria and dozens of other contaminants — the same categories EPA regulates.
Test your water at homeWe may earn a commission if you request quotes through this link. It costs you nothing and never affects the data we publish.
Denver tap water FAQ
Is tap water safe to drink in Denver?
Denver's systems logged 1 health-based violation in 2021–2026, most commonly surface water treatment rule. A violation is a red flag for a period of time, not a permanent condition — your utility's current Consumer Confidence Report shows today's status, and a certified home test shows what's at your tap.
Who supplies Denver's water?
Denver Water Board (serving about 1,287,000 people); Crestview Wsd (serving about 23,756 people); Cherry Creek Valley Wsd (serving about 22,000 people); North Washington Street Wsd (serving about 14,500 people). Data: EPA Safe Drinking Water Information System, July 2026.
How hard is the water in Denver?
City-level hardness isn't published in a single federal dataset, but Colorado averages 185 PPM — "very hard" on the USGS scale. Your utility's water quality report lists Denver's exact hardness, or a $10 test strip tells you in a minute. If it comes back over 120 PPM, see our water softener guidance in the purification calculator.
Do I need a water filter in Denver?
With 1 health-based violation on record in 2021–2026, a certified filter is reasonable insurance here: reverse osmosis ($150–$1,300 installed, Angi 2026) covers lead, nitrates and PFAS at the tap. Test first ($50–$200) so you buy for what's actually present.
Averages describe states, not your faucet. A certified home water test screens for lead, nitrates, bacteria and dozens of other contaminants — the same categories EPA regulates.
Test your water at homeWe may earn a commission if you request quotes through this link. It costs you nothing and never affects the data we publish.