You can find fireworks information on the Washington State Patrol, Office of the State Fire Marshall’s website in addition to Pierce County’s Fire Marshall’s page.
Below is an excerpt of Pierce County’s fireworks code:
D. Dates When Sales and Purchases Permitted. No permit holder shall sell at retail or offer for sale nor shall any person purchase any fireworks authorized to be sold in this Chapter within the unincorporated area of the County, except from 12:00 noon to 11:00 p.m. on June 28, from 9:00 a.m. to 11:00 p.m. from June 29 through July 4, and from 9:00 a.m. to 9:00 p.m. on July 5 of any year. Sale and purchase of fireworks on December 27 through December 31 authorized by RCW Chapter 70.77 is specifically prohibited in unincorporated Pierce County.
E. Dates When Discharge Permitted. No person shall use or explode any fireworks within the unincorporated area of the County except from between 12:00 noon and 11:00 p.m. on June 28 and between 9:00 a.m. and 11:00 p.m. on June 29 through July 3,
between 9:00 a.m. and 12:00 midnight on July 4, and between 9:00 a.m. and 11:00 p.m. on July 5 of any year; provided, that this prohibition shall not apply to duly authorized public displays where the same are authorized pursuant to the laws of the State; and
provided further, that this prohibition shall not apply to persons or organizations specified in Item G., below. Discharge of fireworks on December 31 and January 1 authorized by RCW 70.77 is specifically prohibited in unincorporated Pierce County.
F. Hours of Discharge. No person shall use or explode any fireworks within the unincorporated area of the County between the hours of 11:00 p.m. and 9:00 a.m., except that the period of discharge on July 4 is extended to 12:00 midnight. Any person
found in violation of this Section shall be subject to the penalties prescribed in RCW 70.77; provided, however, this Section shall not apply to authorized public displays as are specified in Item G., below.
G. Exemptions from Discharge Time Regulations. The discharge of fireworks by religious organizations for ceremonial use and/or by private organizations or persons for specific uses, when approved by the Fire Marshal, shall be permitted at any time or date so approved.