Lockdown requirements include restricting public gatherings to no more than five people.
Prime Minister Tuila'epa Sa'ilele Malielegaoi said individuals would be fined $US45 for their first offence and $US245 for a repeat.
Fines for organisations - including churches - are $US2,080, increasing to $US2,916.
Tuila'epa said people breaching the lockdown requirement would have the offence lodged as a criminal record which would affect overseas travel.
