City of Boulder/USGS Water Quality Monitoring
Water Quality Index for February, 2006 at
Boulder Creek Below Coal Creek

Grade C For February, 2006 the WQI rating at Boulder Creek Below Coal Creek (BC-bCC) was Medium (C) due to a WQI value of 60.37. 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 122.30 89.42 0.17 15.20
Fecal Coliform #/100 mL 20.00 61.54 0.16 9.85
pH pH 9.01 49.67 0.11 5.46
Total Phosphate mg PO4/L 2.08 23.23 0.10 2.32
Nitrates mg NO3/L Data Unavailable
Turbidity NTU 9.10 76.07 0.08 6.09
Total Solids mg/l 441.00 39.03 0.07 2.73
Totals (factors, total) 0.69 41.65
Adjusted WQI 60.37

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: Boulder Creek Above Coal Creek

WQI at Downstream Station: Middle Boulder Creek @ Nederland WTP

WQI for January at this station

WQI for March at this station

Return to WQI map for February


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Last Page Update - Thursday March 01, 2007