The bill signed Tuesday gives state school officials more say about transforming the lowest achieving schools.
Under the measure, if schools fail to improve, the state Office of Superintendent of Public Instruction would come in to try and turn around the school. The school could ultimately be shuttered if it doesn't improve.
The state teachers union opposed the bill because of a provision that may allow districts to reopen contract negotiations to help with school transformation.
The new law builds onto an existing school accountability system that the Legislature, OSPI and the State Board of Education have been working on for years.
The school accountability bill is Senate Bill 5329.