Rangers and WA Police have found a number of vehicles registered to people who did not live in the South West at surfing spots, beaches and boat ramps.
Temporary laws were introduced by the state government to stop people from travelling without an exemption through WA's regions in response to the COVID-19 pandemic.
A road block was setup on the Forrest Highway by WA Police to check if people moving between regions had an exemption to do so.
It is understood Perth and Mandurah residents have been travelling to the region on back roads through Boddington, in the Peel region, and Collie to avoid the road block.
Citiy of Busselton mayor Grant Henley said it was disappointing.
"Fines can be issued by police for those people who have clearly travelled across intrastate borders without appropriate exemption which doesn't include the desire to go fishing, surfing or boating in the South West," he said.
"We are lobbying police for additional patrols and checkpoints into the area, particularly on lesser known back routes, leading up to Easter.
"Quite simply that travelling to the South West to fish or surf is not essential travel and no exceptions apply. If you do this you are breaking the law and carelessly increasing the risk of COVID-19 infection.
"Ordinarily we would welcome visitors to the region but these are not ordinary times and for now South West beaches are for local residents only noting that they must also adhere to social distancing and gathering regulations."
"It is important to avoid a fracas. The best advice is to report these people to the police."
Vasse MLA Libby Mettam said she had discussed the issue with the WA Government and WA Police who advised they would have mobiles patrols to respond to any reports of people breaking the law.
"You can report those you suspect have deliberately flouted the intrastate/interstate travel ban by contacting WA Police. The police reporting line is 131 444 in addition to the COVID reporting line," she said.
"The City of Busselton Rangers also have a role in managing and reporting these individuals to police as well, this would include jumping playground barriers.
"The Premier and Police Commissioner have made a very clear direction publicly that you should stay at your main residence and heavy fines can be imposed on people caught attempting to subvert.
"We're asking everyone in the state to do the right thing by each other, and stay home until we get through this."
Collie-Preston MLA Mick Murray said everyone needed to take this situation and the measures put in place seriously.
"It is disappointing to hear reports of people using alternative routes in order to flout the regional travel restrictions that have been put in place to protect Western Australians by limiting the spread of the COVID-19 virus," he said.
"Police are aware of this, and have implemented mobile patrols that can stop motorists at any time.
"If you travel across the regional borders without a valid exemption you will be heavily fined. If you think these rules don't apply to you just because you want to go favourite surf spot you're gravely mistaken.
"This is a hugely irresponsible action that could lead to friends, family or strangers being at increased risk of being caught up in the pandemic.
"Right now is not the right time to visit the South West, but there will be plenty of time to do that once we've all come out the other side of this pandemic - the sooner we all pull together, the sooner that will be."
A State Government spokesperson said police were aware that in certain locations, some members of the public were attempting to circumvent regional border control points.
"That's why they have also implemented mobile patrols, and police have the power to stop any motorist to request an explanation for their travel," the spokesperson said.
"Fines will be enforced for those who don't do the right thing. If you are trying to travel without a valid reason, there's a good chance you'll get caught.
"The State Government's message to the community remains - this is about stopping the spread of COVID-19 and potentially saving lives. Everyone has a responsibility to do their bit for their fellow Western Australians."
