Chapter 173-303 WAC

On Jan. 28, 2019, Ecology adopted amendments to Chapter 173-303 WAC, Dangerous Waste Regulations. These regulations set standards for the safe management of dangerous wastes. Ecology amended specific sections of the dangerous waste regulations to incorporate new federal hazardous waste rules. We restructured the regulations for easier use and improved compliance, similar to the Environmental Protection Agency (EPA) changes. These changes to the dangerous waste regulations affect most dangerous waste generators and how they manage their dangerous waste.

The rule changes also provide generator flexibility in managing wastes in a more cost-effective and protective manner. Amendments include several state-initiated technical changes and editorial corrections, clarifications and other changes.

Rulemaking amendments:

EPA rules include:

  • Conditional Exclusions for Solvent-Contaminated Wipes
  • Revisions to the Definition of Solid Waste
  • Revisions to the Export Provisions of the Cathode Ray Tube (CRT) Rule
  • Hazardous Waste Generator Improvements Rule
  • Hazardous Waste Export-Import Revisions
  • Hazardous Waste Electronic Manifest Rule
State-initiated changes include, but are not limited to:
  • Changes to the PCB waste exclusion reducing duplicative regulation of state-only PCB wastes also regulated under the Toxic Substances Control Act 40 CFR Part 760.
  • Above-ground signage requirements for underground dangerous waste tanks.
See the proposed language for more details on all changes.

Rulemaking timeline


Announcement phase (CR-101)

Filing date:
Feb. 21, 2017

Announcement documents



Rule development phase

for second CR-101 February 21, 2017 - July 2018

Public input & involvement

In 2016, Ecology developed draft rule language and asked for public feedback. An informational webinar was held November 2016-view it on YouTube.

In 2017, Ecology held two public meetings and a webinar to explain the changes and hear from you. Ecology accepted informal comments on the preliminary draft rule in fall 2017. View comments

Related Documents

Rule proposal phase (CR-102)

Filing date:
Aug. 9, 2018

Rule proposal documents:

Comment period

The comment period closed October 5, 2018.
Public hearings were held:
  • September 26, 2018 (webinar format)
  • September 28, 2018 (in-person) 

Rule adoption phase (CR-103)

Adoption date:
Jan. 28, 2019

Rule effective date:
April 28, 2019

Rule implementation information:

Additional languages

Español (Spanish) 中文 (Chinese) Tiếng Việt (Vietnamese) 한국어 (Korean)


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