Aqua Pennsylvania on Friday filed for a 15.4 percent water rate increase, which would boost the typical residential monthly bill by $9.22, from $59.85 to $69.07. The water company said the filing was its first rate increase request since 2011.

The Bryn Mawr company, which has 450,000 water and wastewater customers in Pennsylvania, said it also filed for an increase in waste water rates, which vary among its 33 rate-filing jurisdictions.

Aqua said it needed the rate increase to recover $2.2 billion in investments it made to improve water and wastewater infrastructure since its last rate increase.

The Pennsylvania Public Utility Commission has up to nine months to approve the request.