City of Boulder/USGS Water Quality Monitoring
Water Quality Index for February, 2007 at
Boulder Creek Below Coal Creek

Grade C For February, 2007 the WQI rating at Boulder Creek Below Coal Creek (BC-bCC) was Medium (C) due to a WQI value of 59.74. 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 50.00 49.77 0.16 7.96
pH pH Data Unavailable
Total Phosphate mg PO4/L 1.28 31.45 0.10 3.15
Nitrates mg NO3/L Data Unavailable
Turbidity NTU 14.20 66.39 0.08 5.31
Total Solids mg/l 532.00 20.00 0.07 1.40
Totals (factors, total) 0.58 34.65
Adjusted WQI 59.74

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 - Tuesday June 12, 2007