NIGP 33536: Ferrous Sulfate and Chelates of Iron and Zinc

NIGP 33536 Ferrous Sulfate and Chelates of Iron and Zinc, an Item code, covers chemical additives and mineral salts that state and local governments purchase for water and wastewater treatment, landscape maintenance, and infrastructure protection. Recent solicitations show demand centered on ferrous iron salts and ferrous chloride for sewer odor and corrosion control in municipal wastewater systems, as well as copper sulfate crystals and liquid forms for county-level maintenance operations. Issuing bodies include municipal water utilities, county maintenance departments, and county procurement offices seeking to establish indefinite-quantity or as-needed supply arrangements with one or more vendors. These are primarily operational purchases tied to routine treatment, asset preservation, and facility maintenance rather than one-time capital projects.

State and local procurement activity under this code concentrates in Florida, with Pasco County having posted two recent solicitations for as-needed supplies (copper sulfate and herbicides/fertilizers/pesticides due June 16 and June 26, 2026). The City of Dallas Water Utilities posted a significantly larger opportunity—an IFB for a thirty-six-month indefinite-delivery/indefinite-quantity sewer odor and corrosion control services agreement with an estimated contract value of $10 million, due June 26, 2026, requiring suppliers of ferrous iron salt and ferrous chloride to meet five years of established experience, maintain multiple insurance coverages, and comply with the city's Small Business Enterprise participation goal and local vendor preference. Pasco County's as-needed large copper sulfate crystals and liquid copper sulfate solicitation (RFQFP261004, due June 26, 2026) carries no disclosed set-asides or estimated value. All three recent opportunities specify indefinite-quantity or as-needed terms with FOB destination delivery and pricing subject to periodic adjustment.