Senior Constable Tom Taylor, of Balclutha, said liquor bans in the two Clutha towns were in place all year round, but some people were trying to push the boundaries.
He said police no longer gave warnings as the ban had been in place for four years.
The liquor ban came into effect in 2008, and is in force 24 hours a day, seven days a week and prohibits the consumption and/or possession of alcohol in key parts of Balclutha and Milton.
The boat-launching area in the Arthur Strang reserve off Hasborough Pl is the only exception, with a liquor ban in place after dark.
The maximum fine for breaching the ban is $20,000.
Snr Const Taylor said anyone under 18 caught anywhere with alcohol could face an instant $200 fine.
Liquor ban areas are:
Balclutha - Balclutha War Memorial Hall area including the car park and public toilets, Charles St and Clyde St next to the Clutha Information Centre. Renfrew St from Clyde St to James and Paisley Sts. Lanark St playground and car park area. Clyde St/Essex St (State Highway 1) from the Clutha Vets corner to the Night 'n Day store. Arthur Strang Reserve (ban in place at boat ramp during darkness hours only). Milton - Gray St from Union St to Ajax St, including the public toilet areas. Union St from the Springfield Rd-Cross St intersection to the Ossian St intersection. The Milton Cenotaph area and Moore Park.
