Firefighters are threatening to withdraw from all non-contractual work in a dispute over pay and conditions.
The Fire Brigades Union said tensions were mounting with employers ahead of talks over pay.
All work outside of a firefighter's core role, such as water rescues and aerial drone operation, could be withdrawn, the union warned.
Matt Wrack, FBU general secretary, said: "Firefighters spend each day risking their lives to save others, but governments and employers have thanked them with a real terms pay cut and massive cuts to jobs, all while piling on new duties onto their daily work.
"Enough is enough. We will not stand by while the work of firefighters is done for free.
"We don't take industrial action likely - no community should have to go without their firefighters' vital non-fire work.
"But we need to make it clear that, unless the Government and fire service employers treat firefighters fairly and with respect, we can and will consider all forms of industrial action."
Additional reporting by Press Association.
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