HARTLAND — Seven Maine wastewater facilities are receiving $29.7 million in grants and loans for upgrades.

The U.S. Department of Agriculture Rural Development grants were announced Tuesday in Hartland in an event celebrating Earth Day. Nationally, a total $387 million is going to 116 similar projects in 40 states and Puerto Rico.

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In Maine, the funds are being used for upgrades to wastewater systems the USDA says will help prevent contamination of the state’s waterways.

USDA Rural Development says it invested $462.5 million in rural Maine communities last fiscal year. Those funds went to projects that improve the economic stability of rural communities.

The Maine grant recipients are: Stonington Water Co., Wiscasset Water District, and the communities of Hartland, Gardiner, Oxford, Van Buren and Danforth.