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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 4 cities serving 572,995 residents
Arapahoe County in Colorado has an average water quality score of 77/100 (Grade B) based on analysis of 4 municipal water systems. The county's water systems serve approximately 572,995 residents.
Water quality in Arapahoe County is fair, with some cities showing room for improvement. Centennial has the best water quality at 88/100.
4 cities ranked by water quality score
| Rank | City | Score | Grade | Population |
|---|---|---|---|---|
| 1 | Centennial Top concern: Haloacetic Acids (21.3% of limit) | 88 | A- | 104,522 |
| 2 | Littleton Top concern: Fluoride (25.9% of limit) | 80 | B+ | 44,367 |
| 3 | Englewood Top concern: Haloacetic Acids (58.9% of limit) | 71 | B- | 37,600 |
| 4 | Aurora Top concern: Total Trihalomethanes (68.2% of limit) | 70 | B- | 386,506 |
Top detected contaminants across county water systems
| Contaminant | Avg Level | Max Level | EPA Limit | % of Limit | Cities |
|---|---|---|---|---|---|
| Haloacetic Acids | 23.758 ug/L | 35.344 ug/L | 60 ug/L | 39.6% | 3 |
| Total Trihalomethanes | 30.304 ug/L | 54.547 ug/L | 80 ug/L | 37.9% | 4 |
| Copper | 0.456 mg/L | 0.696 mg/L | 1.3 mg/L | 35.1% | 3 |
| Lead | 0.005 mg/L | 0.01 mg/L | 0.015 mg/L | 31.3% | 4 |
| Fluoride | 1.109 mg/L | 1.381 mg/L | 4 mg/L | 27.7% | 3 |
| Nitrite | 0.265 mg/L | 0.46 mg/L | 1 mg/L | 26.5% | 4 |
| Mercury | 0.001 mg/L | 0.001 mg/L | 0.002 mg/L | 26.3% | 4 |
| Nitrate | 2.269 mg/L | 4.406 mg/L | 10 mg/L | 22.7% | 3 |
Recent violations across county water systems
Water quality in Arapahoe County, Colorado reflects the region's unique combination of water sources, treatment infrastructure, and environmental factors. Our comprehensive analysis examines 4 municipal water systems serving a combined population of over 572,995 residents.
The county shows moderate water quality performance, with scores ranging from 70/100 in Aurora to 88/100 in Centennial. This 18-point spread indicates relatively consistent water quality standards across municipal systems.
The most prevalent contaminants detected across Arapahoe County water systems include Haloacetic Acids, Total Trihalomethanes, Copper. All monitored contaminants remain within acceptable levels relative to EPA Maximum Contaminant Levels (MCLs).
Water quality in Arapahoe County is fair but shows room for improvement. Residents in cities scoring below 70 should consider water filtration, particularly for drinking and cooking. Check your specific city's report above for personalized recommendations.
Arapahoe County has an average water quality score of 77/100 (Grade B) based on analysis of 4 municipal water systems serving 572,995 residents.
Centennial has the highest water quality score in Arapahoe County at 88/100. View the detailed report for Centennial.
Given the water quality variation across Arapahoe County, we recommend reviewing your specific city's water quality report. 0 cities have scores below 70, where filtration is particularly recommended.
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.