Water at various locations in the distribution system is tested by certified City staff and a private, state-certified laboratory using the latest testing procedures and equipment. During 2018, numerous tests were conducted on samples taken from the distribution system. In addition to these tests, Valley Water and SFPUC perform their own water quality analyses of the source and treated water.
Test results from the distribution system and source water analyses are shown in the table at right. Some of the data, though representative, are more than one year old. SWRCB allows monitoring for some constituents less than once per year since their concentrations do not change frequently.
Lab analysis was also performed for many constituents other than those listed in the tables; only those constituents detected in the tap water are shown. For a complete list of all the constituents analyzed or any questions about this report, please contact a Water Quality Engineer at 408-277-3671.