The District is seeking proposals for professional services and water‑treatment chemical supplies for the A.K. Warren Water Resource Facility, a 400‑MGD plant serving over 4.8 million residents and businesses. The solicitation requires electronic submission via QuestCDN, mandates a pre‑qualification process, and includes a mandatory site‑visit to review the scope before bidding. • Provide chemicals and related services for primary and secondary wastewater treatment at the Warren Facility. • Mandatory site‑visit on March 25 2026 (10:00 AM) at 24501 South Figueroa Street, Carson, CA. • Pre‑qualification required; online bidding only through QuestCDN; proposals due by April 16 2026, 11:00 AM PDT. • Scope includes chemical supply, handling, dosing system support, and any associated professional consulting. • All bidders must be on the QuestCDN plan‑holder list; no paper submissions accepted.