BASIN-USGS-COB Boulder Creek Millenium Baseline
Boulder Creek Watershed
Total Hardness Data for 2000 - Boulder Creek above WW Plant

Preliminary Data - subject to revision

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
Factors affecting Total Hardness
Standards regarding Total Hardness
Interpretation of Boulder Creek Total Hardness data
Data Source:
Point of Contact:
Collection and Analysis notes

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

Date Hard
mg/L as CaCO3
June, 2000 60.0
October, 2000 120.0
*value below detection limit:
Detection Limit (if available) 0.1

Preliminary Data - subject to revision

Select on the parameter name to view all Total Hardness time series plots on the basin map. Select on the table date to view stream Total Hardness 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

INVITATION BASIN is a community project actively seeking public participation. We appreciate all feedback and welcome comments, suggestions and contributions. To find out more about how you can be involved, click here.

BASIN is funded through the US EPA EMPACT Program

Home | Site Map | Glossary | Bibliography | Contributors
About BASIN | Attribution | Feedback | Search
Last Page Update - Tuesday December 27, 2005
IMS support provided by