Map bar plots are plotted
on the following scale
North Boulder Creek - Boulder Creek
Total Hardness Time Series for 1999
Select on the map plot to view detailed time series information for Total Hardness at that site. Select on the site icon to view time series information for all parameters at that site.
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.