SouthWest Water Co. said it completed its $427 million acquisition by institutional investors and went private at the end of trading Monday.

Shareholders of the Los Angeles water utility, which operates water and wastewater treatment systems in California and four other states, are receiving $11 in cash for each share of stock.

The company said the deal gives it more resources to invest in systems and be more responsive to customers.

“The company’s new owners are deeply committed to our industry and their long-term perspective was instrumental in securing the approvals required to complete this transaction several months earlier than expected,” said Chief Executive Mark Swatek in a statement.

The institutional investors were advised by J.P. Morgan Asset Management and Water Asset Management LLC, which made the investments on behalf of the undisclosed investors.