BOSTON — Environmental and public health activists are pushing a bill on Beacon Hill that would phase out the state’s purchase of bottled water and encourage the use of tap water by state agencies and at state-sponsored events.

Activists say the change could save the state millions in taxpayer dollars.

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They also say increased reliance on bottled water can undermine political support to maintain critical public water systems.

The push to wean the state off bottled water comes weeks after a ban in Concord on the sale of single-serving plastic water bottles took effect.

Activists there said a return to tap water would cut down on plastic waste and reduce the use of the fossil fuels used to make the bottles.