• District Rule 4550
    Conservation Management Practices

Summary of Rule Amendment Efforts

District Rule 4550 was adopted in 2004, establishing the first rule of its kind in the nation.  Rule 4550 reduces fugitive particulate emissions from agricultural operations through the required reduction in the number of passes through a field taken by agricultural equipment and through the implementation of other conservation management practices (CMPs).  Rule 4550 established a then-unique menu approach of control techniques to accommodate the wide variability of agricultural industries found in the San Joaquin Valley, which is an approach that has since been duplicated by other agencies. 

Per commitments in the 2018 PM2.5 Plan, the District is undergoing a rule evaluation process to promote conservation tillage practices and evaluate other potential enhancements to the CMP program to reduce dust from agricultural operations, and improve soil health. 

District Contact

Recent and Upcoming Public Meetings

Date & Time Notice Materials
Monday, November 7th, 2022 at 3:30 PM Notice of Public Workshop


Thursday, December 16th, 2021 at 3:00 PM Notice of Public Workshop