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As the basis of any fertilizer routine, one needs to know what is in the water that is supplied to them. A quick email or phone call to your local water company can get you all the information you need. You may need to ask for a Water Quality Specialist for the detailed info. Also ask about your water source for your address.

San Jose, CA Local water quality (Lawrence expressway and 280)
San Jose Water Quality Report

A quick email to my water company revealed,
Water Source - Summer = 25% Well 75% Import
Water Source - Winter = 60% Well 40% Import
From the report,

example of how I calculated totals,
(25 % X 308)+ (75 % X 104)=155

Spreadsheet to help fill out information,
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