Tetra Tech Inc., a consulting and engineering firm based in Pasadena, has been awarded a $60 million water resources contract from Los Angeles County, the company announced Sept. 11.

The three-year, multiple-award engineering services contract includes planning and support for flood hazard mitigation, water reuse and supply management and drinking water well design.

Multiple-award contracts are dispensed by governmental agencies to several contractors to maintain competition throughout the contract period. Tetra Tech’s announcement did not mention how many other firms also received this contract.

Shares in Tetra Tech slipped 30 cents to $70.05 at the close of trading.

The announcement comes nearly three weeks after the 52-year-old firm won a $650 million, multiple-award contract from the U.S. Agency for International Development to secure property rights for community improvements around the globe.

Health business reporter Dana Bartholomew can be reached at [email protected]. Follow him on Twitter @_DanaBart.