This chart may help you determine which fireworks are generally allowed:
https://www.wsp.wa.gov/wp-content/uploads/2021/05/Consumer-Fireworks-Legal-in-Washington.pdf
"Consumer fireworks" means:
(as defined in RCW 70.77.136 includes the following devices manufactured in accordance with the American Pyrotechnics Association Standards outlined in WAC 212-17-021):
(a) Ground and hand-held sparkling devices;
(i) Wire sparkler/dipped stick;
(ii) Cylindrical fountain;
(iii) Cone fountain;
(iv) Illuminating torch;
(v) Wheel;
(vi) Ground spinner;
(vii) Flitter sparkler;
(viii) Toy smoke device;
(b) Aerial device;
(i) Helicopter, aerial spinner;
(ii) Roman candles;
(iii) Mine and shell devices;
(iv) Aerial shell kit, reloadable tube.
(c) Multiple tube fireworks devices - Cake.
WAC 212-17-025 Definition and classification—"Fireworks."
"Dangerous fireworks" means:
(a) Any firework in its originally manufactured form that meets the standards for a consumer firework as established in this chapter, that has been altered, modified, enhanced, manipulated, tampered, or disassembled.
(b) Fireworks that are examined or tested for compliance with standards established for consumer fireworks and determined to possess characteristics of design or construction that make such item unsafe for use by any person not specially qualified or trained in the use of fireworks. The determination may be made by:
(i) The consumer product safety commission;
(ii) Bureau of Alcohol, Tobacco, Firearms and Explosives;
(iii) State fire marshal's office; or
(iv) Department of labor and industries.
(c) All fireworks designed and intended by the manufacturer to create the element of surprise upon the user. (d) Fireworks that explode upon impact or by friction, unless otherwise classified by the state fire marshal pursuant to this chapter.
WAC 212-17-025 Definition and classification—"Fireworks."
In addition, any fireworks that are home made, modified, or imported are prohibited by law.