The city of St. Helena’s water system recently failed a drinking water standard, city officials said Thursday evening. … The city routinely monitors its distribution system for the presence of drinking water contaminants. Testing results received for Nov. 10, 2020, and March 9, 2021, showed the system exceeded the standard or maximum contaminant level —MCL — for haloacetic acids, or HAA, [Jo Ann Burkman, acting chief operator for the city's water division] said. The standard MCL for haloacetic acids is 60 ug/L; the running annual average for the LSWTP Distribution System in the fourth quarter of 2020 measured 68 ug/L…