Monthly wastewater bills for more than 126,000 residential customers in the Upstate will increase by 10% during the next two years under a rate hike that won unanimous approval Monday from board members for the Renewable Water Resources utility.

More than 5,000 commercial and industrial customers will see higher increases.

Renewable Water Resources, also known as ReWa, serves customers in Greenville County and parts of Anderson, Spartanburg, Pickens and Laurens counties. The proposed rate hikes are expected to generate $12 million in additional revenue as they are phased in in 2022 and 2023.

ReWa's monthly base charge for homes and businesses with the smallest water meters will rise from $12 to $12.38 next year and then go up again to $12.75 in 2023. The utility's monthly volume charge for residential customers also will increase from the current fee of $5.86 per 1,000 gallons to $6.27 next year and $6.56 in 2023.