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

Grade A For August, 2006 the WQI rating at Boulder Creek at Orodell (BC-ORO) was Excellent (A) due to a WQI value of 94.79. 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 7.40 93.61 0.11 10.30
Total Phosphate mg PO4/L 0.07 95.32 0.10 9.53
Nitrates mg NO3/L Data Unavailable
Turbidity NTU 1.22 94.92 0.08 7.59
Total Solids mg/l 33.00 85.48 0.07 5.98
Totals (factors, total) 0.53 50.24
Adjusted WQI 94.79

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 July at this station

WQI for September at this station

Return to WQI map for August


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Last Page Update - Thursday March 01, 2007