Highway 92 closed due to hazardous liquid spill

1 min read

The eastbound lanes of Highway 92, before the 101 interchange in San Mateo, is closed through the evening because of a hazardous liquid spill. 

The San Mateo Consolidated Fire Department advises drivers to avoid the area. 

Public safety officials for the California Highway Patrol, San Mateo Police Department, and San Mateo Consolidated Fire Department are on the scene.

The source of the spill was a large flatbed that dumped unknown liquid on the roadway, which spread across all lanes. 

Later on, the liquid was identified as sodium bisulfite. 

The truck reportedly dumped 330 gallons of sodium bisulfite in a tank.

A school in the area is relocating students to a different campus. 

All eastbound 92 lanes are closed and traffic is diverted through the City of San Mateo via Delaware Street. 

According to the City of San Mateo, no injuries have been reported as a result of the incident. 

According to the San Mateo County Department of Emergency Management, the liquid material is very low risk but is slightly corrosive. Anyone who drove their car through it is advised to wash it with water thoroughly. 

What is sodium bisulfite?

The San Mateo Fire Department identified the liquid as sodium bisulfite, a material used to treat water.

According to the CDC, it irritates eyes, skin, and mucous membranes if inhaled, ingested, or comes in contact with eyes or skin.


Charlene is a Bay Area journalist who hails from the small community of Fresno. Drawing from her experience writing for her college paper, Charlene continues to advocate for free press and local journalism. She also volunteers in all the beach cleanups she can because she loves the water.

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