MONTPELIER, Vt. (AP) – The U.S. Environmental Protection Agency on Friday released the final phosphorus reduction goals to help clean up Lake Champlain.

The mandates call for the amount of phosphorous to be reduced by 33.7 percent in the lake and 64.3 percent in Missisquoi Bay.

The reductions for 12 segments of the lake range from a low of 11.6 percent in Shelburne Bay to the Missisquoi Bay requirement.

A similar draft proposal was released last summer.

The phosphorous reduction requirement is part of a broader effort to clean up Lake Champlain. The report said 82.8 percent of the pollution that reaches Missisquoi Bay is from agricultural sources.

The primary concern is runoff that carries pollutants such as phosphorus. Since 1990, phosphorus concentrations in several segments of the lake have continued to increase, causing problems that include toxic algae blooms.

The EPA had previously rejected a cleanup plan that Vermont had drafted. Last year, Vermont passed a clean water act in an effort to clean up the lake and in part to avoid the possibility the EPA would impose a solution that many felt would have been more expensive and less effective.

The Conservation Law Foundation said it was pleased with the EPA limits.

“We will now be turning our attention to making sure that the state puts in place pollution controls to achieve these limits and clean up the lake,” said staff attorney Elena Mihaly, who said the state has three months to revise its implementation plan.

The state has 20 years to implement the plan.