STMP (Development Fee) Information

In 1988 Contra Costa County residents adopted Measure C, a half-cent sales tax measure for transportation projects and programs which voters renewed in 2004 with the passage of Measure J. These ballot measures require that local jurisdictions develop a program of regional traffic mitigation fees, assessments, or other mitigations, as appropriate, to fund regional and subregional transportation projects. In developing these fee programs, local jurisdictions are required to consider such issues as jobs/housing balance, carpool and vanpool programs, and proximity to transit service in the establishment of the regional traffic mitigation program.

West County traffic is heavily impacted by through traffic from other regions in Contra Costa County as well as other counties. The West County Subregional Transportation Mitigation Program (STMP) was developed with the participation and concurrence of local jurisdictions in determining the most feasible methods of mitigating regional traffic impacts.

In late 2016, WCCTAC began the process of updating the STMP and its nexus study.  This update was a multi-step process during which WCCTAC’s staff and consultants worked closely with the WCCTAC TAC and made periodic check-ins with the WCCTAC Board and local jurisdictions.  The consultant team developed a series of technical memos which evaluated the prior 2005/2006 program, reviewed West County existing conditions and growth projections, developed criteria for a project list and identified projects and determined the nexus between the projects and the maximum potential fee that could be charged.  These memos are provided below.  The technical memos are summarized in the Final Report of the 2019 Nexus Update of the STMP Impact Fee.  

During the first quarter of 2019, the Cities of El Cerrito, Hercules, Pinole, Richmond, and San Pablo, as well as the County of Contra Costa each adopted a new ordinance implementing the 2019 STMP update. These jurisdictions share a desire to assure that new development in West County pays its fair share toward regional circulation and transit improvements that are proportional to the traffic impact the new development will generate. The local fees collected in West County provide congestion relief to mitigate traffic on regional routes and through improved transit service.

The updated 2019 STMP program began on July 1, 2019.  Fees are adjusted each year based on the Engineering News Record's February Construction Cost Index for the San Francisco Bay Area.

STMP Fees Effective July 1, 2022 - June 30, 2023


Type of Fee

STMP Fee per Unit

STMP Fee per Square Foot


Single Family

$ 6,458


Multi Family

$ 3,181


Senior Housing

$ 1,744


Hotel (per room)

$ 4,133


Storage Facility


$ 0.90




$ 7.82




$ 6.60




$ 10.35


Other (per AM peak hour trip)

$ 8,727



Effective July 1, 2020, per the Master Cooperative Agreement with participating jurisdictions, the STMP fees will be adjusted annually based on the Engineering News Record's San Francisco Bay Area Construction Index.

As of July 1, 2023, the following STMP Fees will be in effect:

STMP Fees Effective July 1, 2023

 Type of Fee   STMP Fee   STMP Fee per
Square Foot
 Single Family   $6,916             
Multi Family    $3,407    
Senior Housing        $1,868    
Hotel (per room)    $4,426     
Storage Facility         $0.97
Retail/Service        $8.38
Industrial        $7.07
Office         $11.09 
Other (per AM peak hour trip)   $9,346    



Participating jurisdictions are responsible for collecting the STMP fee and forwarding it to WCCTAC. The STMP fee amounts should be listed on each individual jurisdiction’s published fee schedule. Staff from participating jurisdictions will calculate the fee due based on the type and scale of the proposed project.

Local jurisdictions’ staff should always complete and submit the STMP Quarterly Reporting Form, whether or not STMP fees were collected during a given reporting period.  The forms are due to WCCTAC no later than 30 days after the end of a quarter.

WCCTAC is empowered by its Joint Powers Authority and Master Cooperative Agreement to coordinate and administer revenue for the regional transportation improvements funded with these fees. Measures C and J also require that all Contra Costa County jurisdictions participate in the regional transportation mitigation program. Jurisdictions that are not participating in such a program are at risk of losing their annual Measure C (and subsequently Measure J) local street maintenance and improvement funds.