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Not health advice. Contact your local water utility for concerns.
Data from EPA Water Quality Reports. For official information, contact your water utility or health department.
Water quality data for 1 cities serving 1,287,000 residents
Denver County in Colorado has an average water quality score of 90/100 (Grade A) based on analysis of 1 municipal water systems. The county's water systems serve approximately 1,287,000 residents.
Overall, Denver County demonstrates good water quality standards. 1 of 1 cities exceed the county average, with Denver leading with a score of 90/100.
1 cities ranked by water quality score
| Rank | City | Score | Grade | Population |
|---|---|---|---|---|
| 1 | Denver Biggest deduction: 34 monitoring/reporting violations in the last 5 years (−10 pts) | 90 | A | 1,287,000 |
Real EPA readings across county water systems (lead: latest 90th percentile; PFAS: UCMR5 2023–2026; others: 2012–2019 averages)
| Contaminant | Avg Level | Max Level | EPA Limit | % of Limit | Cities |
|---|---|---|---|---|---|
| TTHM (2012–2019 avg) | 23.023 ug/L | 23.023 ug/L | 80 ug/L | 28.8% | 1 |
| HAA5 (2012–2019 avg) | 13.743 ug/L | 13.743 ug/L | 60 ug/L | 22.9% | 1 |
| Lead (90th percentile) | 3.1 ppb | 3.1 ppb | 15 ppb | 20.7% | 1 |
| Fluoride (2012–2019 avg) | 0.615 mg/L | 0.615 mg/L | 4 mg/L | 15.4% | 1 |
| Radium (2012–2019 avg) | 0.333 pCi/L | 0.333 pCi/L | 5 pCi/L | 6.7% | 1 |
| Uranium (2012–2019 avg) | 0.245 ug/L | 0.245 ug/L | 30 ug/L | 0.8% | 1 |
| Nitrate (2012–2019 avg) | 0.068 mg/L | 0.068 mg/L | 10 mg/L | 0.7% | 1 |
| Arsenic (2012–2019 avg) | 0.018 ug/L | 0.018 ug/L | 10 ug/L | 0.2% | 1 |
Recent violations across county water systems
Monitoring & reporting — Monitoring, Turbidity (Enhanced SWTR) - Interim Enhanced Surface Water Treatment Rule
2/29/2024
Showing 10 of 20 recent violations
Water quality in Denver County, Colorado reflects the region's unique combination of water sources, treatment infrastructure, and environmental factors. Our comprehensive analysis examines 1 municipal water systems serving a combined population of over 1,287,000 residents.
The county shows strong water quality performance, with scores ranging from 90/100 in Denver to 90/100 in Denver. This 0-point spread indicates relatively consistent water quality standards across municipal systems.
The most prevalent contaminants detected across Denver County water systems include TTHM (2012–2019 avg), HAA5 (2012–2019 avg), Lead (90th percentile). Every county-wide average sits below 50% of its EPA Maximum Contaminant Level (MCL).
Denver County's water quality is generally good. Residents can feel confident in their tap water quality, though those with specific health concerns or sensitivity to certain contaminants may still benefit from filtration. Regular review of your city's annual Consumer Confidence Report is recommended.
Denver County has an average water quality score of 90/100 (Grade A) based on analysis of 1 municipal water systems serving 1,287,000 residents.
Denver has the highest water quality score in Denver County at 90/100. View the detailed report for Denver.
Most cities in Denver County have water that meets EPA standards. However, a water filter can provide additional protection and improve taste. The need depends on your specific city and any personal health considerations.
Click on any city in the rankings table above to view its detailed water quality report, including contaminant levels, EPA compliance history, and filter recommendations.