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 treatment products that state and local governments procure for wastewater treatment, infrastructure protection, and turf management. Recent solicitations show that municipalities and counties are actively buying liquid and crystalline ferrous compounds—specifically ferrous sulfate (FeSO4) and ferrous chloride (FeCl2)—as part of sewer odor and corrosion control programs, alongside copper sulfate for general facility maintenance and turf chemical applications for parks and recreational facilities. Issuing bodies include county governments (Pasco County, Florida; White County, Georgia) and municipal utilities (City of Dallas Water Utilities), each procuring these materials on an as-needed or seasonal basis under indefinite-quantity arrangements.

The code sees active procurement across Florida and Georgia. The City of Dallas issued a significant bid (Solicitation BR2600030262, due June 26, 2026) for a thirty-six-month ID/IQ sewer odor and corrosion control services contract with an estimated value of $10 million, requiring contractors to inject ferrous iron salt and ferrous chloride additives into the wastewater collection and treatment system and mandating SBE participation under the DRIVE Policy with 30–38 percent subcontracting benchmarks. Pasco County, Florida posted two as-needed procurements: an RFQ (RFQFP261004, due June 26, 2026) for large copper sulfate crystals and liquid copper sulfate, and an IFB (IFBSP26074, due June 16, 2026) covering herbicides, fertilizers, and pesticides with deliveries to two county maintenance facilities and a contract term through September 30, 2029 with CPI-based price adjustments. White County, Georgia solicited an RFP (PE77037NONST2026000000022, due April 2, 2026) for chemical application services at three parks and recreation facilities, including turf fertilizer and weed-control applications at a total evaluated score of 100 points (15 percent pricing weight).