RCW vs WAC, and how to watch the law your clients live under

Short version: the RCW is the law the Legislature passes. The WAC is the rules state agencies write to carry it out. Both are binding. Only one of them is written by anyone you can vote for.

Understanding the split is what turns bill tracking into actually covering a client, because your client doesn't operate under a bill number. They operate under a chapter of the code.

RCW, Revised Code of Washington

The RCW is every general law currently in effect in Washington, organized by subject.

When a bill passes and the governor signs it, it becomes a session law, then gets folded into the RCW: amending sections, adding new ones, or repealing old ones. The RCW is the current state of the law, not the history of it.

Citations look like RCW 36.70A.070:

• 36: Title (Counties)
• 70A: Chapter (Growth Management)
• 070: Section

The chapter is usually the useful unit.

WAC, Washington Administrative Code

The WAC is the regulations. Agencies, boards, and commissions write them to implement statutes, and they have the force of law.

An agency can only write rules where a statute gives it authority. Every WAC rule traces back to an RCW section that authorizes it. That's the "statutory authority" cited on every rulemaking filing.

Citations look like WAC 314-55-010:

• 314: Title, and each WAC title belongs to one agency (314 is the Liquor and Cannabis Board)
• 55: Chapter
• 010: Section

Because a WAC title maps to an agency, the number tells you who wrote the rule. RCW titles don't work that way. They're organized by subject, not by author.

How they fit together

The Legislature passes a law saying, in effect, "this activity is now regulated, and the Department of X shall adopt rules." That goes into the RCW. The agency then spends months writing the actual rules: forms, thresholds, deadlines and definitions, and those go into the WAC.

The statute says what. The rule says how, and how is usually where the money is.

Watching a statute instead of a list of bills

This is the part that changes how you work.

A bill-number list can only ever contain bills you already found. A statute watch catches the ones you didn't.

Open the RCW reader, search a citation or drill down by title and chapter, and you'll get the section text with in-text citations you can click straight through. Then:

• 🔔 Watch this statute. Any new bill that touches that cite shows up in your daily email. Turning a watch on doesn't dump the backlog at you. You only hear about bills introduced after you subscribed, which is the point.
• 🔎 Find bills related to this RCW. The reverse lookup: every bill that has ever referenced or amended that cite, grouped by biennium, newest first. This is how you get the history of a chapter in one view.
• 📋 Find agency rules under this RCW. The rulemaking filings citing that statute as their authority.

A chapter-level cite works, not just a full section. Watching 36.70A covers the whole Growth Management Act.

The fight doesn't end when the bill passes

Three practical things fall out of the split:

1. A bill can pass vague and get decided in rulemaking, six months later, in a process almost nobody watches. If you lobbied a bill and then stopped paying attention, you may have won the bill and lost the rule.

2. Rulemaking is public and slower. Agencies file notices in the Washington State Register, a preproposal, then a proposed rule with a public hearing and comment period, then the adopted rule. There's more notice and more room to influence it than a bill hearing gives you, and far less competition for attention.

3. Interim is when this happens. The Legislature is out from spring to January; agencies are not. If you only work January through March you're missing the half of the process where the details get written.

Following rulemaking

The Agencies & rulemaking section covers the other half:

• Every WA rule-making body: agencies, boards, commissions, universities, with its Administrative Code title.
• The recent Washington State Register filings: proposed, preproposal, permanent, emergency, expedited. Each shows the subject, the comment deadline, the affected WAC, and the RCW authority linked back into the RCW reader.
• 🔔 Watch an agency and new filings from it land in the same daily email as everything else.
• 📅 Sync a rule's hearing into your calendar, the same as a committee hearing.

There's also a WAC reader in the app, so you can go bill → statute → rules written under it → the rule text, without leaving.

The short version

• RCW = statutes, written by the Legislature, changed by bills.
• WAC = rules, written by agencies, changed by rulemaking.
• Track bills for what's happening this session; watch statutes for what you'd otherwise never hear about; watch agencies for what happens after the bill passes.

Last updated July 30, 2026.