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


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

Grade B For July, 2006 the WQI rating at Boulder Creek above WW Plant (BC-aWWTP) was Good (B) due to a WQI value of 76.36. 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	102.90	98.84	0.17	16.80
Fecal Coliform	#/100 mL	230.00	32.12	0.16	5.14
pH	pH	7.92	88.85	0.11	9.77
Total Phosphate	mg PO4/L	0.05	97.26	0.10	9.73
Nitrates	mg NO3/L	Data Unavailable
Turbidity	NTU	13.50	67.21	0.08	5.38
Total Solids	mg/l	88.00	83.87	0.07	5.87
Totals (factors, total)				0.69	52.69
Adjusted WQI					76.36

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 June at this station

WQI for August at this station

Return to WQI map for July

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!