BASIN: Water Quality Index for May, 2006 at Boulder Creek above WW Plant


	City of Boulder/USGS Water Quality Monitoring
	Water Quality Index for May, 2006 at Boulder Creek above WW Plant

Grade B For May, 2006 the WQI rating at Boulder Creek above WW Plant (BC-aWWTP) was Good (B) due to a WQI value of 78.43. 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	106.20	98.35	0.17	16.72
Fecal Coliform	#/100 mL	110.00	40.87	0.16	6.54
pH	pH	7.45	93.77	0.11	10.31
Total Phosphate	mg PO4/L	0.02	98.23	0.10	9.82
Nitrates	mg NO3/L	Data Unavailable
Turbidity	NTU	14.30	66.39	0.08	5.31
Total Solids	mg/l	146.00	77.26	0.07	5.41
Totals (factors, total)				0.69	54.12
Adjusted WQI					78.43

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 at 61st St.

WQI at Downstream Station: Boulder Creek above Dry Creek

WQI for April at this station

WQI for June at this station

Return to WQI map for May

Thank You! BASIN was a community project which benefitted from over 1000 hours of public volunteer time. BASIN was highlighted by the US EPA in a national case study in its 2001 handbook Delivering Timely Environmental Information to Your Community. Thank you to all volunteers, and especially to the late Jim Waterman, BASIN Project Coordinator!