The toilet in the hall bathroom is the one the house came with: tall tank, heavy lid, a flush that still clears the bowl the first time. When the new vanity and tile went in, it stayed, because nothing was wrong with it.
That is the belief: a fixture that works stays. In California, working is not the test for a house built on or before January 1, 1994. The test is how much water the toilet was made to use per flush, and a permitted remodel is where somebody checks.
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What actually happens
The rule is SB 407, a 2009 state law written into the Civil Code as Sections 1101.1 through 1101.9, in effect since January 1, 2010. It covers homes and commercial buildings built and available for use on or before January 1, 1994…