The Buy Clean California Act, (Public Contract Code § 3500-3505), states the Department of General Services (DGS) is required to establish and publish the maximum acceptable Global Warming Potential (GWP). Its targets embedded carbon emissions of structural steel (hot-rolled sections, hollow structural sections, and plate), carbon steel rebar, flat glass, and mineral wool board insulation. These materials must have a GWP that does not exceed the limit set by DGS.


Find key legislation dates below.


January 1, 2019 – Awarding authorities will request submission of Environmental Product Declarations (EPDs). (Management Memo No. 19-01)

January 1, 2020 – Awarding authorities will require submission of EPDs.

January 1, 2021 DGS will publish the maximum acceptable GWP for eligible materials.

July 1, 2021 – Awarding authorities will gauge GWP compliance of eligible materials with EPDs.


EPD submissions shall be developed according to the Product Category Rules (PCRs) found in the resources section below.


  • DGS will host a second External Stakeholder Event to share updates for the Buy Clean California Act (AB 262) on October 31, 2019.


    This event will be held at DGS headquarters in West Sacramento, California.  Registration is required and seating is limited. A simultaneous Zoom webcast will be provided for those who cannot attend in person.


    The meeting agenda will include:


  • Buy Clean California Act (aka AB 262) - Update

  • Maximum Acceptable Global Warming Potential (GWP) Limit Methodology

  • Environmental Product Declarations (EPDs) Allowed for Compliance

  • Agency Compliance Model

  • DGS request to industry


    Registration: External Stakeholder Event

    Date and Time:

    Thursday, October 31, 2019

    1:30 p.m. – 4:30 p.m. PDT



    DGS Headquarters – Auditorium

    707 3rd Street, West Sacramento, CA  95605

  • The City of Berkeley has adopted Resolution No. 68,893-N.S. to support the implementation of the Buy Clean California Act along with the city of Cupertino (Resolution No. 19-040) and Richmond (Resolution No. 68-18).

June 10, 2019

DGS participated in a teleconference with the American Center for Life Cycle Assessment (ACLCA).


May 8, 2019

DGS participated in a teleconference with the members of the American Institute of Steel Construction.


April 17, 2019

DGS held a workshop meeting with awarding agencies.


April 16, 2019

DGS participated in a teleconference with members of the National Glass Association.


April 11, 2019

DGS participated in a webinar sponsored by the ACLCA.


April 3, 2019

DGS participated in a teleconference with members of the Concrete Reinforcing Steel Institute.


March 29, 2019

DGS met with the Director of the Carbon Leadership Forum.


March 20, 2019

DGS met with members of the North American Insulation Manufacturers Association.


March 14, 2019

DGS met with representatives of the Nucor Steel Corporation.


DGS expects to continue engaging with internal and external stakeholders as we implement the Buy Clean California Act.

U.S. Green Building Council is proud to assist manufacturers of steel, flat glass, and mineral wool insulation through the Buy Clean Incentive Program by offering incentives of up to $15,000. The incentive can be used to acquire their Environmental Product Declaration and green their own supply chain and manufacturing processes. 

Program Operator Consortium (POC) develops PCRs, reviews and verifies EPDs, reports Life Cycle Assessment (LCA), and publishes customized Type III environmental declaration formats in accordance with the International Standard ISO 14025.


Find PCRs and EPDs on their website

UL Environment develops PCRs and verifies EPDs alongside the POC.

Find PCRs that are under development or may not be covered by the POC.
EPDs in the UL SPOT database. Once there, enter the product name, look for certifications, then EPDs.


Reference PCRs for eligible materials:

Structural steel and carbon steel rebar
Title: North American Product Category Rule for Designated Steel Construction Products
Valid through: May 5, 2020
Version: 1.0
Program operator: SCS Global Services


Flat glass
Title: GANA PCR for Flat Glass: UN CPC 3711
Valid through: March 31, 2020 (extended per PCRext 2019-101)

Program operator: NSF International


Mineral wool board insulation
Title: Part B: Building Envelope Thermal Insulation EPD requirements
Valid through: April 10, 2023
Version: 2.0
Program operator: UL Environment

DGS held an external stakeholder meeting on June 26, 2018 and had a comment period to receive stakeholder feedback. Find DGS responses by clicking on the link below:

DGS Response Summary

If you would like a copy of all industry comments, please send a request via email to


Engineering Branch

Department of General Services
Procurement Divsion

707 Third Street, Second Floor
West Sacramento, California 95605

To ensure that your questions receive accurate and timely responses, please provide your name, phone number, and agency/organization name.