A bill to protect a key source of drinking water in Illinois from carbon dioxide injection will go to Gov. JB Pritzker after it overwhelmingly passed by the House on Tuesday.

S.B. 1723 provides what many lawmakers viewed as key protections for the Mahomet Aquifer in central Illinois, which supplies drinking water to nearly a million people in 14 counties. It comes a year after Pritzker, a Democrat, signed into law a moratorium on CO2 pipelines in Illinois.

Pritzker is expected to sign the bill but a spokesman couldn’t be reached for comment Wednesday.

The measure prohibits carbon sequestration above, below or through a sole-source aquifer, defined by EPA as one that supplies at least half the drinking water for an area and where no alternative source exists. But the bill would allow an ongoing CO2 injection project in an aquifer recharge area to continue after labor and business interests insisted it be carved out of the prohibition.