可能旧金山housing收入标准比较高。

In San Francisco County – where you'll find the highest income limits in the country – a single person qualifies for the Section 8 program with an income of $51,350. If there are more people in the family household, income limits could be more than $96,000 annually to qualify for Section 8.

https://homeguides.sfgate.com/income-requirements-apply-section-8-housing-8509.html?