NIGP 33512: Ammonium Sulfate

NIGP 33512 Ammonium Sulfate is an Item code under which state and local governments procure nitrogen-based fertilizers and related chemical compounds for grounds maintenance, parks operations, and water treatment applications. Recent solicitations show state and local buyers purchasing ammonium sulfate in granular form (typically 50-pound bags), along with related products such as copper sulfate crystals and liquid copper sulfate. The work encompasses both direct fertilizer supply contracts and participation in broader herbicide, fertilizer, and pesticide as-needed frameworks. Issuing bodies include county governments (Pasco County and Gwinnett County, Florida and Georgia respectively) and their departments of parks and recreation, indicating that the code draws primarily from county-level procurement activity for grounds and landscape maintenance operations.

Recent activity concentrates in the Southeast, with Pasco County, Florida and Gwinnett County, Georgia posting multiple solicitations between May and June 2026. Gwinnett County issued an Informal Written Quote (IWQ 130290) in May 2026 for 840 bags of 34-0-0 Ammonium Sulfate to supply county parks across 15 delivery locations, with quotes due May 20, 2026 and expected contract value below $2,499.99; award went to the lowest responsive and responsible quote with 30-day payment terms following delivery on an F.O.B. Destination basis. Pasco County issued an Invitation for Bid (IFB-SP-26-074) in May 2026 for as-needed herbicides, fertilizers, and pesticides including ammonium sulfate, with bids due June 16, 2026, spanning a three-year initial contract period through September 30, 2029 with two optional one-year extensions; Pasco County also posted a separate request for quote (RFQFP261004) in June 2026 for copper sulfate on an indefinite-quantity basis due June 26, 2026. Vendors must typically demonstrate three years in business, provide project references, maintain required insurance, comply with E-Verify and debarment certification requirements, and accept bi-annual price adjustments based on CPI-U where applicable.