City of Boulder Storm Water Quality Program
Boulder Creek Watershed
pH Time Series for 1998
Boulder Creek above WW Plant

Preliminary Data - subject to revision

Marker Indicates no data available
Marker Indicates data exceeds plot scale.

Information on pH:

pH measures hydrogen concentration in water. pH is presented on a scale from 0 to 14. A solution with a pH value of 7 is neutral; a solution with a pH value less than 7 is acidic; a solution with a pH value greater than 7 is basic. Natural waters usually have a pH between 6 and 9. The scale is negatively logarithmic, so each whole number (reading downward) is ten times the preceding one (for example, pH 5.5 is 100 times as acidic as pH 7.5). The pH of natural waters can be made acidic or basic by human activities. For example, coal-burning power plants and heavy automobile traffic can produce nitrous oxides and sulfur dioxide, making the rain and snow highly acidic.

More general information about pH
Measurement of pH
Factors affecting pH
Standards regarding pH
Interpretation of Boulder Creek pH data
Data Source: City of Boulder Water Quality Monitoring
Point of Contact: Chris Rudkin
Collection and Analysis notes
Analysis method: YSI 600XL probe

Monitoring site information:
BC-aWWTP Photo
  • Location: Boulder Creek above WW Plant
  • Name: BC-aWWTP
  • Type: Composite
  • Frequency: Monthly
  • Longitude: 105 ° W 11'
  • Latitude: 40 ° N 30'
  • Elevation: 5125 feet asl
  • Site photo
Downstream Site: Boulder Creek at 75th St
Upstream Site: Boulder Creek at 61st St.

Plot Label Date pH
stnd units
01 January, 1998 8.13
02 February, 1998 7.95
03 March, 1998 No Data
04 April, 1998 8.02
05 May, 1998 No Data
06 June, 1998 7.27
07 July, 1998 8.20
08 August, 1998 No Data
09 September, 1998 8.33
10 October, 1998 7.54
11 November, 1998 7.41
12 December, 1998 No Data
*value below detection limit:
Detection Limit (if available) NA

Preliminary Data - subject to revision

Select on the parameter name to view all pH time series plots on the basin map. Select on the table date to view stream pH profiles observed on that date. Select here to view all parameters at this site.

Return to the BASIN water quality catalog

Return to the BASIN environmental data catalog

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