City of Boulder Water Quality Monitoring
Boulder Creek Watershed
North Boulder Creek - Boulder Creek
Longitudinal Total Hardness Profiles for October, 2000

Preliminary Data - subject to revision


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

Information on Total Hardness:

Hardness generally refers to the amount of calcium and magnesium in water. In household use, these cations (ions with a charge greater than +1) can prevent soap from sudsing and leave behind a white scum in bathtubs. In the aquatic environment, calcium and magnesium help keep fish from absorbing metals, such as lead, arsenic, and cadmium, into their bloodstream through their gills. Therefore, the harder the water, the less easy it is for toxic metals to absorb onto gills. Water in the Boulder Creek watershed is generally soft because the water comes mainly from melting snow which is low in minerals and metals.

More general information about Total Hardness
Measurement of Total Hardness
Factors affecting Total Hardness
Standards regarding Total Hardness
Interpretation of Boulder Creek Total Hardness data
Data Source: City of Boulder Water Quality Monitoring
Point of Contact: Chris Rudkin
Collection and Analysis notes
Analysis method: SM 2340C

Indicated monitoring site:

The above map indicates water quality monitoring sites. To view data at a specific site select it from the map with the mouse.


Plot Label SiteName Hard
mg/L as CaCO3
NBC-Lw North Boulder Creek diversion to Lakewood 12.6
NBC-FALLS North Boulder Creek at Boulder Falls 80.0
BC-ORO Boulder Creek at Orodell No Data
BC-CAN Boulder Creek at Eben G. Fine Park 50.0
BC-61 Boulder Creek at 61st St. 260.0
BC-aWWTP Boulder Creek above WW Plant 120.0
BC-75 Boulder Creek at 75th St 210.0
BC-aDC Boulder Creek above Dry Creek 200.0
BC-95 Boulder Creek at 95th St 200.0
BC-107 Boulder Creek at 107th St 190.0
BC-aCC Boulder Creek Above Coal Creek 260.0
BC-bCC Boulder Creek Below Coal Creek 300.0
*value below detection limit:
Detection Limit (if available) 0.1

Preliminary Data - subject to revision

Select on the parameter name to view more detailed information for that parameter in this month. Select on the site name to view data time series observed at that station. For monitoring site locations see site location map.

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