SAN FRANCISCO (CBS SF) — Ride sharing companies can be a convenient way to get to the airport, but California is saying that’s a no-go.

The California Public Utilities Commission put companies like Uber and Lyft on notice, saying they can’t do business at the airport unless they make an agreement with the individual airport.

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“If immediate action is not taken to bring your operation into compliance, the CPUC will begin enforcement actions, including revocation of your permit in the near future,” the CPUC wrote in a letter to the companies.

Is a statement, Uber told KPIX 5 that the company’s staff has spent months meeting with airport officials across California, and is trying to work out arrangements with them that fall in line with CPUC regulations.

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Taxi drivers say they want the companies out, and the competition the bring with them.

“The whole situation is because of corruption. The Silicon Valley has bought out politicians and bureaucrats. They’re rolling over rules and regulations. They don’t care,” one Luxor Cab driver said.

Ride sharing company Sidecar told KPIX 5 they have ordered their drivers to stop going to the airport until the issue gets sorted out.

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Lyft did not respond to our request for comment.