This month, San Mateo County and a handful of nearby local governments officially recognized what many of us already knew: Large rent increases and no-cause evictions are an urgent civil rights issue on the Peninsula. These practices, which thrive in the brutal rental market on the Peninsula, undermine the housing security of many — but they disproportionately harm African-American, Latino, Filipino and Pacific Islander renters. Left unchecked, the displacement crisis we now face will lead to a new era of housing segregation.

Now that the county has acknowledged the problem, it has a moral — and a legal — obligation to combat it.