Erin Brockovich arrested on alcohol charge Arrested: Erin Brockovich. Environmental activist Erin Brockovich, portrayed by Julia Roberts in a movie about her fight over the pollution of a California town, has been arrested on suspicion of boating while intoxicated. Ms Brockovich was arrested late on Friday night after breath tests showed her blood-alcohol level was just over twice the legal limit of .08, said Edwin Lyngar, spokesman for the Nevada Department of Wildlife. A game warden noticed she was struggling and needed assistance while trying to moor her motorboat at the Las Vegas Boat Harbour, he said. Julia Roberts as Erin Brockovich. Ms Brockovich had been out on the boat with a male companion but was alone when she tried to dock it. "She was not sure how to manoeuvre the boat into the dock," Mr Lyngar said. It's a simple thing if you can think clearly. But if you add alcohol and unfamiliarity of the area, it can all cause serious problems. Ms Brockovich, 52, was released from the Clark County Detention Centre after posting $US1000 ($A1050) bail. In a statement issued on Sunday, she apologised but stressed that she did not operate the boat in open waters. She only moved the boat within its own slip, she said. "At no time was the boat away from the dock and there was no public safety risk," she said. That being said, I take drunk driving very seriously, this was clearly a big mistake, I know better and I am very sorry. After a day in the sun and with nothing to eat it appears that a couple of drinks had a greater impact than I had realised. She said "there was no public safety risk" and her arrest "was clearly a big mistake." In Australia, Ms Brockovich has appeared on television as the face of law firm Shine Lawyers. The firm's website refers to her as a spokeswoman. Under Nevada law, a first-time offence of boating while intoxicated is a misdemeanour that draws fines from $US1000 to $US2000 but no jail time. Ms Brockovich's efforts to sue Pacific Gas & Electric for polluting the water supply of a small Southern California town were adapted into a big-screen story, Erin Brockovich, starring Roberts in the Oscar-winning title-role. Last year, Ms Brockovich was back on the big screen in the documentary Last Call at the Oasis, which explores challenges related to the planet's dwindling and increasingly polluted water supply.