Conclusions - State of Water Quality
· There was an increasing trend in suspended solids observed through visual appraisal of the data during 198-1997. Turbidity and non-filterable residue levels were elevated during freshet when higher flows resulted in increased runoff and erosion. Remediation of turbidity sources and levels is needed.
· The water was well buffered against acid inputs throughout the year, but yet quite soft for drinking water.
· The water was cool or cold enough throughout most of the year to be aesthetically pleasing for drinking, and usually warm enough during the summer months to permit water-contact recreation such as swimming.
· Fecal coliforms probably did not meet the water quality objective for the South Thompson River designed to protect raw drinking water for use after only disinfection, and the remediation of the sources of fecal contamination is probably needed.
· During freshet, elevated levels of aluminum and iron occurred. These levels may not have been of concern however, since they were due to the increased suspended sediment in the water, and thus were probably mostly biologically unavailable.
· During freshet, elevated levels of phosphorus occurred, but the phosphorus was largely in particulate form, and not readily available for algal growth.