Perris II Desalter Corrosion Repair
Summary
SCH Number
2026070380
Public Agency
Eastern Municipal Water District
(EMWD)
Document Title
Perris II Desalter Corrosion Repair
Document Type
NOE - Notice of Exemption
Received
Posted
7/10/2026
Document Description
Eastern Municipal Water District's (EMWD) Perris II Desalter facility uses reverse osmosis (RO) to treat salty, brackish groundwater and produce drinking water. EMWD staff identified corrosion and leaks at various places on the stainless-steel RO feed piping. These corroded materials were sampled, and laboratory testing indicated the presence of microbiologically influenced corrosion (MIC) that could not be removed with disinfection or chemical treatment. The purpose of the proposed project is to replace the entire RO feed assembly with piping resistant to MIC. The scope also includes the replacement of three unlined stainless steel cartridge filters and the addition of pressure sustaining valve to address excessive vibration in adjacent RO concentrate discharge piping. 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
Menifee
Counties
Riverside
Regions
Citywide, Countywide, Southern California
Cross Streets
29541 Murrieta Rd
Zip
92586
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
Art. 19, Sec. 15301(b)
Reasons for Exemption
Implementation of the project would result in the minor alteration of an existing facility with no expansion to the existing use and public utility service provided. The proposed project would replace the RO feed assembly piping, replace three cartridge filters, and add a pressure sustaining valve. The project would not increase the capacity of the desalter facility.
County Clerk
Riverside
Attachments
Notice of Exemption
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