NIGP 50557: Laundry Alkalis: Sodium Hydroxide (Caustic Soda), Sodium Metasilicate, Sodium Orthosilicate, etc.

NIGP 50557, Laundry Alkalis: Sodium Hydroxide (Caustic Soda), Sodium Metasilicate, Sodium Orthosilicate, Etc., is an Item code under which state and local governments procure liquid sodium hydroxide (caustic soda) primarily for municipal water treatment and wastewater reclamation operations. The code covers supplies meeting drinking-water treatment standards — typically 25% to 32% solution grades conforming to ANSI/AWWA B501 standards and NSF/ANSI 60 certification — delivered in bulk loads and totes to treatment facilities on a requirements basis. Municipal water and wastewater departments issue the solicitations under this code, with contracts structured as one-year agreements with optional annual renewals, F.O.B. destination delivery within five business days of order, and Net 30 payment terms. Suppliers must furnish compliance affidavits, certificates of analysis, material safety data sheets, spill response plans, and proof of insurance prior to award.

The City of Greenville, Texas and the City of Salem, Oregon represent recent activity under this code. Greenville issued IFB 2026ANNUALSUPPLIES068 (due August 18, 2026) for approximately 150 dry tons of 32% sodium hydroxide annually, equivalent to 50,000 to 70,000 gallons, for its Water Production Plant and Wastewater Reclamation Center. Salem issued Bid No. 267050 (due June 17, 2026) for 25% sodium hydroxide in dual delivery streams — 1,000-gallon bulk loads to the Aquifer Storage and Recovery Treatment Facility and 280-to-330-gallon totes to the Wiessner Emergency Intertie — totaling approximately 13,500 gallons annually priced on a per-pound basis. Both solicitations permit electronic submission and reserve cooperative purchasing rights absent explicit restriction by the bidder. Oregon's non-resident bidder preference may apply under state administrative services guidance on the Salem bid.