Perris Valley Regional Water Reclamation Facility Biofilter Maintenance Project
Summary
SCH Number
2026100501
Public Agency
Eastern Municipal Water District
(EMWD)
Document Title
Perris Valley Regional Water Reclamation Facility Biofilter Maintenance Project
Document Type
NOE - Notice of Exemption
Received
Posted
10/15/2026
Document Description
Eastern Municipal Water District's (EMWD) Perris Valley Regional Water Reclamation Facility (PVRWRF) utilizes a biofilter to collect and treat foul odors associated with the plant's treatment process. The biofilter is a four-cell structure that has a combined surface area of about 40,000 square feet. It can treat up to 105,000 cubic feet of foul air per minute. Currently, the biofilters are experiencing poor distribution of foul air due to degradation of the rock diffuser media layer and its impacts to the diffuser lateral pipes. Scope of work for the proposed project would include the removal and replacement of the rock diffuser media layer as well as repairs to the diffuser lateral pipelines. Beneficiaries of the project are EMWD ratepayers
Contact Information
Name
Martha Vilchis
Agency Name
Eastern Municipal Water District
Job Title
Water Resources Specialist Assistant I
Contact Types
Lead/Public Agency / Project Applicant
Address
Phone
Email
Location
Cities
Perris
Counties
Riverside
Regions
Citywide, Southern California
Cross Streets
Case Rd and Mapes Rd
Zip
92570
Other Location Info
1301 Case Rd.
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
15301
Reasons for Exemption
Implementation of the proposed project would result in repair, maintenance, and minor alteration of existing biofilter used for odor control at the PVRWRF. The removal and replacement of the rock media layer as well as rehabilitations to the diffuser lateral pipelines would not increase the capacity of the biofilters but would allow them to continue to treat the foul odor emits by the treatment process. The project is a rehabilitation project and is not a result of an increase to the PVRWRF's capacity being increased.
County Clerk
Riverside
Attachments
Notice of Exemption
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