Despite an accelerated effort this summer to fight the spread of aquatic invasive species in Minnesota lakes -- including stiffer fines, more boat inspections and widespread publicity -- many boaters continue to violate the law.
So far this summer, about 16 percent of the 12,000 boaters checked by Department of Natural Resources conservation officers have been cited for not passing inspections.
That's a slight improvement from mid-June, when noncompliance was about 20 percent -- a figure officials then called unacceptable.
But the violation rate at DNR random roadside check stations, begun midsummer, is more than 35 percent, said Phil Meier, DNR enforcement division operations manager.
"We don't really have an understanding of why there's that big of a difference," he said. Noncompliance at some stops has exceeded 50 percent, he said.
"Obviously 1 percent is too high," Meier said.
So far, the DNR has issued 1,977 citations and warnings, more than double the 850 issued all of last year.
"We're going to keep doing what we can do to stop the spread," Meier said. "Hopefully our actions are making a difference."