SB5476 – Protects established composting sites from being sued for creating a public nuisance.
Prime Sponsor – Senator Kuderer (D; 48th District; Bellevue)
Current status – Referred to Senate Committee on Agriculture, Water, Natural Resources & Parks. Still in committee by 2019 cutoff; reintroduced and retained in present status for 2020 session. Failed to make it out of committee by cutoff; dead bill.
Next step would be –  Scheduling a hearing.
Legislative tracking page for the bill.
HB1167 is an identical companion bill in the House.

Summary –
Currently, agriculture and forestry activities that are consistent with good practices in those fields, and were established before other surrounding activities (like neighboring housing developments), are protected from lawsuits claiming that they are creating a public nuisance because of things like smells or noise, unless they’re having a substantial negative effect on public health or safety.

The bill extends this protection to composting activities. (Composting must also be meeting city and county regulations to qualify for this protection.)