City of Boulder/USGS Water Quality Monitoring
Water Quality Index for October, 2006 at
Boulder Creek at Orodell

Grade A For October, 2006 the WQI rating at Boulder Creek at Orodell (BC-ORO) was Excellent (A) due to a WQI value of 91.78. The chart below details the WQI calulations at this site. See the detailed explanation of the WQI method for more information.


Parameter Unit Parameter Value Q-value Weight Factor Total
DO% % sat 0.00 99.00 0.17 16.83
Fecal Coliform #/100 mL Data Unavailable
pH pH 6.83 81.31 0.11 8.94
Total Phosphate mg PO4/L 0.06 97.26 0.10 9.73
Nitrates mg NO3/L Data Unavailable
Turbidity NTU 3.05 89.51 0.08 7.16
Total Solids mg/l 71.00 85.48 0.07 5.98
Totals (factors, total) 0.53 48.64
Adjusted WQI 91.78

The WQI is computed by converting measured Water Quality Parameters to "Q-Values" using charts developed by the National Sanitation Foundation (NSF) water quality scientists. The Q-Values are then multiplied by a weighting factor based on the importance of that water quality parameter. These values are totaled and then divided by the sum of the weight factors.

WQI at Upstream Station: North Boulder Creek at Boulder Falls

WQI at Downstream Station: Boulder Creek at Eben G. Fine Park

WQI for September at this station

WQI for November at this station

Return to WQI map for October


INVITATION: BASIN is a community project actively seeking public participation. We appreciate all feedback and welcome comments, suggestions and contributions. To find out more about how you can be involved, click here.

Home | Site Map | Glossary | Bibliography | Contributors
About BASIN | Attribution | Feedback | Search
Last Page Update - Thursday March 01, 2007