What type of snake is this?

No, it isn't a night snake.

It's an amelanistic (albino) Gopher snake.

The Pacific Gopher snake occurs in your area- however it is more likely that you have an escaped or released pet. While amelanistic snakes are commonly bred in captivity, they are quite rare in the wild. Their pale colors make them an easy target for predators. Either way you should not release it.

Are there any snake hobbyists in your neighborhood that may have lost it?

If it is an actual wild albino Pacific, you have something unique on your hands.

You can e-mail me more photos if you like, and I'll try to give you a more specific ID.

It seems like night snake. Hypsiglena torquata, commonly known as the night snake, is a species of rear-fanged colubrid. It was once thought to range throughout the southwestern and western United States, as well as in Mexico and British Columbia, Canada. However, H. torquata is now restricted to western Mexico, from the Sonora-Sinaloa border through Nayarit and Jalisco to Michoacan and Guerrero. Total length is 12–26 in (30–66 cm). It is pale gray, light brown, or beige in color, with dark grey or brown blotches on the back and sides. The night snake's head is rather flat and triangular-shaped and usually has a pair of dark brown blotches on the neck. It also has a black or dark brown bar behind the eyes that contrast against the white or pale gray upper labial scales, and the pupil of the eye is vertical. The belly is white or yellowish. Females are usually longer and heavier than males.

Hm... Probably a night snake.

it looks like a night snake to me. i might be wrong, but it's harmless either way. the only venomous snake in washington is the western rattlesnake, which i think you'd be able to recognize by the rattle.

A rattlesnake

No