RFP for Flow Reversal Reverse Osmosis Retrofit Constructability Study (RFP-24-022)

The Orange County Water District (“OCWD” or District) is seeking proposals from qualified and experienced firms to provide professional consulting services to develop a flow reversal reverse osmosis (FRRO) retrofit constructability study. The study will evaluate the constructability of retrofitting an existing 5-million gallon per day (mgd) permeate production potable reuse reverse osmosis unit at the OCWD Groundwater Replenishment System (GWRS) to high-recovery FRRO to increase recovery from existing 85% to 90% or more, complete a life-cycle cost estimate, and provide recommendations for full-scale retrofit. OCWD intends to evaluate the proposals received and enter into a One-Year Professional Services Agreement (“Agreement”) with the qualified firm. The work is expected to commence on November 1, 2025. This Agreement will be for a minimum term of one (1) year for the period from November 1, 2025 to October 31, 2026.

RFP Documents:

RFP for Flow Reversal Reverse Osmosis Retrofit Constructability Study (RFP-24-022) – Posted 07/10/2025
Addendum No. 1 for RFP-24-022 – Posted 07/28/2025

Solicitation Schedule:

RFP Issued	Thursday, July 10, 2025
Pre-Proposal Meeting	N/A
Questions Due Date	Thursday, July 24, 2025, at 12:00 PM PT
Proposals Due	Monday, August 11, 2025 at 10:00 AM PT

For questions, please contact at procurement@ocwd.com.