Denver, Colorado Water Quality Report
Water quality data for 91 water systems serving 1,376,307 people.
Water Source
Detected Contaminants
| Contaminant | Detected Level | EPA Limit (MCL) | Health Guideline | % of Limit | Status |
|---|---|---|---|---|---|
| lithium | 10.8 | No federal limit | 10.0 ug/L(EPA/USGS HBSL) | 108% | Above guideline |
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Compliance & Violations
Active Violations (52)
52
Oct 1, 2025
52
Oct 1, 2025
35
Jul 11, 2025
35
Jul 11, 2025
5A
Jul 11, 2025
5A
Jul 11, 2025
4H
Jul 2, 2025
4H
Jul 2, 2025
4H
Jul 2, 2025
4H
Jul 2, 2025
52
Jul 1, 2025
51
Jul 1, 2025
71
Jul 1, 2025
52
Jul 1, 2025
72
Jul 1, 2025
71
Jul 1, 2025
51
Jul 1, 2025
51
Jul 1, 2025
51
Jul 1, 2025
71
Jul 1, 2025
71
Jul 1, 2025
71
Jul 1, 2025
71
Jul 1, 2025
71
Jul 1, 2025
75
May 1, 2025
75
May 1, 2025
75
Apr 28, 2025
75
Apr 28, 2025
75
Apr 28, 2025
75
Apr 28, 2025
5A
Apr 11, 2025
5A
Apr 11, 2025
2E
Feb 1, 2025
4G
Feb 1, 2025
2E
Oct 17, 2024
2E
Oct 17, 2024
4G
Oct 17, 2024
2E
Oct 17, 2024
4G
Oct 17, 2024
4G
Oct 17, 2024
52
Oct 1, 2024
52
Oct 1, 2024
52
Oct 1, 2024
66
Dec 30, 2023
66
Dec 30, 2023
66
Dec 30, 2023
34
Dec 13, 2023
34
Dec 13, 2023
72
Oct 1, 2023
71
Jul 1, 2023
75
Mar 26, 2023
75
Mar 29, 2019
Resolved Violations (948)
66
Oct 1, 2025
66
Oct 1, 2025
66
Oct 1, 2025
3A
Sep 1, 2025 — Sep 30, 2025
3A
Sep 1, 2025 — Sep 30, 2025
+ 943 more resolved violations
Frequently Asked Questions
Is Denver tap water safe to drink?
Denver's water meets all EPA maximum contaminant levels. However, 1 contaminants were detected at various levels. Some residents may prefer additional filtration for peace of mind.
What contaminants are in Denver tap water?
1 contaminants have been detected in Denver's water supply across 91 water systems. See the full contaminant table above for details.
How can I improve my water quality in Denver?
Install a water filter rated for the specific contaminants found in Denver's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does Denver have any water quality violations?
Yes, Denver currently has 362 active violations. See the violations section above for details.