In case you didn't get the message already - PM Jacinda Ardern really wanted you to 'stay at home' during the coronavirus lockdown.

People living in a licensing trust area are concerned about non-residents flouting lockdown rules to purchase booze.

West Auckland is one of 18 areas in the country where alcohol sales are controlled by a licensing trust – meaning residents can't buy booze in supermarkets.

The Portage and Waitākere Licensing Trusts, collectively known as The Trusts, have 10 West Liquor shops open for customers in West Auckland during the lockdown.

RICKY WILSON/STUFF Lines outside of West Liquor Lincoln Rd in Henderson on Monday.

Unlike major supermarkets that only sell wine, beer and ciders, Trusts outlets sell a wide variety of alcohol, including RTDs, spirits and liquor.

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But Westies are complaining that people outside the area are driving to West Liquor to shop, breaking one of the lockdown rules of only travelling locally.

Police and the Trusts said they were both aware of the issue and warned action may be taken if this continues.

Riverhead resident Meshaelin Naicker said it was ridiculous people were putting other's safety at risk just for alcohol.

"We're supposed to be staying within our own areas, they should not be allowed," Naicker said.

"It seems to me that a lot of people don't care about others, just themselves, which is very sad as we need to work together to get on top of this difficult time in our country."

Another resident said he came across some people from outside of West Auckland in a line when he went to buy beer on Wednesday.

"I've been hearing about this but I was surprised to come across it myself. They were in line and boasting about how they travelled far just to buy booze. And, they were complaining about the lines too," he said.

"Maybe that's why the lines are huge too, because non-residents are taking it up."

RICKY WILSON/STUFF 10 West Liquor shops are open during the nationwide lockdown.

The Trusts acting chief executive Matt Williams said it had received reports of people travelling from outside West Auckland to shop, which concerned him greatly.

"We are here to serve the West Auckland community and we fully support the government's advice that people should stay within their local area."

The Trusts had a system in place where each customer is expected to register their details with them in case of contact tracing.

"If we believe that people have ignored this request and travelled outside of their local area, we will provide their details to the police."

Waitematā West Area Commander inspector Stefan Sagar said police continued to make regular visits to West Liquor outlets to monitor the issue.

Alert Level 4 restrictions mean people should only be leaving their homes for essential services and all travel should be restricted to their local area, he said.

"Police want to warn those not complying with restrictions that we will be out in public monitoring this activity and follow up action may be taken for those refusing to comply."