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The Walla Walla County Department of Public Works consists of a diverse staff of 59 engineers, surveyors, construction and GIS Specialists, equipment operators, road maintenance crews, mechanics and professional support staff operating across 1300 square miles in Southeast Washington. The Public Works Department is responsible for the planning, engineering, design, construction, operation and maintenance of approximately 1000 miles of county roadways, 200 bridges and over 5 miles of flood control channel. Department staff also coordinates new development transportation infrastructure design and construction, provides county-wide GIS support, and oversees the County stormwater management program.

The Jail is located in the Public Safety Building at corner of Central and Prospect Streets, opposite the entrance to Sheriff's Office. Jail entrance is off Central Street, in between Prospect Street and Grand Avenue.

The Prosecuting Attorney is an elected position,  partisan, 4-year term. Duties are established by state constitution and statutes. The mission of the office is to represent the interests of the State of  Washington in the prosecution of criminal actions occurring within Whatcom County; to  provide legal advice to County officials and employees; to represent and defend the County  in all civil actions in which the County is a party.

Washington has 39 Superior Courts, one in each of Washington's 39 counties. Superior Courts are the trial courts of general jurisdiction in Washington. A Superior Court may consider all civil and criminal matters occurring within a county's boundary. The Superior Court also has exclusive jurisdiction over civil matters in which the amount in controversy is more than $75,000, felony cases, estate and probate matters, family law cases(including divorces and child custody hearings), and juvenile proceedings. They act as a court of appeal for cases from the District and Municipal Courts.