Washington State classifies sex offenders into one of three categories.  If a person is required by law to register as a sex offender, they must notify the Sheriff's office of their current address. 

Sex Offender Classifications

Level 1
Low risk to re-offend.  Level 1 offenders MAY NOT be the subject of public notification.

Level 2
Moderate risk to re-offend.  Level 2 offenders MAY OR MAY NOT be the subject of public notification.

Level 3
High risk to re-offend.  Level 3 offenders MAY BE the subject of public notification.

Visit the Benton County Sheriff's Office to view sex offender information for the City of Richland.

The U.S. Department of Justice now maintains a national sex offender public registry, covering all 50 states.  You can visit their site here.