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Supplemental Environmental Projects (SEP)

Supplemental Environmental Projects (SEPs) are environmentally beneficial projects not otherwise legally required that a respondent agrees to undertake as part of a settlement agreement to resolve an enforcement action.


Maricopa County Air Quality Department (MCAQD) will, where appropriate and feasible, accept SEPs in lieu of fines paid directly to the department. In October 2012, MCAQD adopted a SEP Policy, which identifies:

  • Categories and criteria that projects must meet to be considered for approval as SEPs and the approval process for SEPs;
  • The penalty mitigation appropriate for a particular SEP; and
  • The terms and conditions under which they may become part of a settlement.

The department’s position is that it is in the public interest for SEPs to be an option in enforcement settlements and that they may be funded, in whole or in part, by respondents. Further, a clear linkage should exist between the actual or potential environmental and public health impacts of a violation(s) of law that are the subject of an enforcement settlement and benefits of a SEP, as defined in A.R.S. §49-117.


Click on the following link to view or download the SEP Policy.


A SEP may be developed by a respondent as a unique proposal intended to fulfill the criteria contained in the SEP Policy as well as meeting the specific needs or preferences of the proposing entity. A respondent may elect to pursue a SEP proposed by a third party to avoid the costs and time associated with SEP development. Respondents may choose from a list of pre-approved SEPs included in the SEP Idea Library. MCAQD has just commenced the development of the SEP Idea Library by soliciting third-party SEP proposals through an open, competitive process being conducted in accordance with the SEP Policy.


Fillable pdf versions of the application forms for SEPs:


SEP Idea Library


The Maricopa County Air Quality Department (MCAQD) will, at any time, accept proposals from qualified tax-exempt 501(c)(3) non-profit or government organizations for “ready to go” Supplemental Environmental Projects (SEPs) for inclusion in the MCAQD SEP Idea Library. The categories of acceptable projects for SEPs are: pollution prevention; pollution reduction; environmental compliance promotion or research; public health; and assessments and environmental management systems. Details and examples of these project categories are available in Section V. and the criteria that will be used to evaluate proposals may be found in Section X. of the SEP Policy.


The Department conducted a Call for Proposals for creating the SEP Idea Library in October and November of 2013. A list of the successful proposals from this process is available by clicking here. Complete project applications are available upon request to SEPinfo@mail.maricopa.gov, in writing or by phone. See detailed contact information below.


The Department will accept applications for inclusion of projects in the SEP Idea Library at any time.


All proposals received outside of a formal call for proposals process will be acknowledged in writing and evaluated for inclusion in the SEP Idea Library on an as-needed basis.


All proposals and correspondence should be addressed to:

SEP Idea Library, ATTN: Ira Domsky
1001 N. Central Avenue, Suite 125
Phoenix, AZ 85004-1944
Email: SEPinfo@mail.maricopa.gov
Phone: (602) 506-6702 Fax: (602) 506-6179