NIGP 89031: Manhole Risers, Steel Expandable

NIGP Item 89031 Manhole Risers, Steel Expandable is a narrowly focused procurement category for steel or steel-composite riser components that extend manhole sections above grade, typically in water, wastewater, and stormwater infrastructure systems. State and local governments solicit these risers as discrete line items within larger water main replacement, sewer rehabilitation, and utility improvement projects, and occasionally as standalone as-needed supply contracts. Recent solicitations show risers specified in standardized configurations—adjustable 23" to 32" diameter units with 1" to 2.5" height increments, typically with stainless steel hardware and malleable or ductile iron bodies—sourced to support emergency repairs and routine infrastructure maintenance across municipal utilities and county water departments.

The issuing-body mix spans county water departments and city utilities, with standout repeat buyers including the City of Dallas Water Utilities (multiple main replacement contracts), Gwinnett County Department of Water Resources (annual supply agreements and spot quotations), and the City of Houston Public Works (casting and riser procurement). Geographic activity concentrates in Texas, Georgia, and Florida; Texas shows the densest recent activity with City of Dallas and City of Houston utilities posting multiple main replacement solicitations in March–June 2026 that include manhole risers as appurtenance line items. Recent representative opportunities include the State of Texas issuing a spot bid for a 32"–32.5" stainless steel riser adjustment (IWQ INF20260234, due June 24, 2026) and the City of Houston seeking sewer casting products including risers via ITB 2026-0010 (response due May 7, 2026, 36-month award with two optional one-year extensions); Gwinnett County issued an annual supply contract for manhole sections, rings, covers, and precast structures (BL050-26, due March 5, 2026) that encompasses riser components as part of a broader manhole assembly procurement. The code sees steady activity in water utility infrastructure modernization cycles but does not command high-value single-award contracts; most riser procurement occurs as part of multi-item supply agreements or embedded in larger construction bids where risers are one of many appurtenances.