Boulder, Colorado Water Quality Report
Water quality data for 18 water systems serving 170,429 people.
Water Source
Detected Contaminants
No contaminant data available for this location.
Get a Free Water Quality Consultation
Connect with a certified water treatment professional in Boulder, Colorado.
Get Water Quality Alerts
Be the first to know when water quality changes in Boulder.
Compliance & Violations
Active Violations (12)
75
Aug 17, 2025
76
Jul 9, 2025
76
Jul 9, 2025
51
Jul 1, 2025
72
Jul 1, 2025
71
Jul 1, 2025
71
Jul 1, 2025
51
Jul 1, 2025
76
Apr 9, 2025
76
Jan 9, 2025
52
Jan 1, 2025
76
Feb 28, 2022
Resolved Violations (488)
5A
Jun 11, 2025
5A
Jun 11, 2025
5A
Jun 11, 2025
5A
Jun 11, 2025
27
Apr 1, 2025 — Jun 30, 2025
+ 483 more resolved violations
Frequently Asked Questions
Is Boulder tap water safe to drink?
Boulder's water meets all EPA maximum contaminant levels. However, 0 contaminants were detected at various levels. Some residents may prefer additional filtration for peace of mind.
What contaminants are in Boulder tap water?
0 contaminants have been detected in Boulder's water supply across 18 water systems. See the full contaminant table above for details.
How can I improve my water quality in Boulder?
Install a water filter rated for the specific contaminants found in Boulder's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does Boulder have any water quality violations?
Yes, Boulder currently has 52 active violations. See the violations section above for details.