Reply The City of New Berlin puts sparklers and fireworks in the same category. The regulation for both is the same as well. (Shutterstock) NEW BERLIN, WI — Fourth of July is coming up soon and some people will plan on holding their own private fireworks shows before, during or after the date. However, those looking to set off their own pyrotechnics displays should check the laws before doing so. Wisconsin law states that possessing or using fireworks that explode or fly off the ground is illegal without a permit, per Wisconsin Statute 167.10. However, cities, villages and towns can write their own fireworks laws and choose whether or not to issue users permits to people.