Unofficial Notice of Invitation to Bid (NIB)

Napa Sanitation District is seeking bids from qualified and interested contractors for the following project titled, 2026 TREATMENT PLANT IMPROVEMENT PROJECT, identified under Solicitation ID: CIP 25707. Work is to be performed near 1515 Soscol Ferry Rd, Napa, CA 94558, USA in Napa County.

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General Project Description

This project involves significant improvements to the Napa Sanitation District's Treatment Plant. The scope includes the replacement of large-diameter influent pipes with Fiberglass Reinforced Plastic (FRP), preparation of reinforced concrete pipes and a primary diversion structure for condition assessment, installation of new flow meters, upgrades to the hypochlorite mix box, and the demolition and replacement of a polymer tank. The work primarily involves heavy and civil engineering construction related to water and wastewater treatment infrastructure.

General Bid Items

Quantity: - Unit: - Work Item: Replacement of 36” steel primary influent pipe from Headworks to primary clarifiers, with FRP (Fiberglass Reinforced Plastic).
Quantity: 1650 Unit: LF Work Item: Preparation of 54" reinforced concrete pipe and Primary Diversion Structure, for condition assessment by others.
Quantity: - Unit: - Work Item: Installation of new magnetic flow meter, on 36" steel pipe.
Quantity: - Unit: - Work Item: Hypochlorite mix box improvements.
Quantity: - Unit: - Work Item: Demolition of existing Pond 4 polymer tank.
Quantity: - Unit: - Work Item: Installation of new polymer tank.
Quantity: - Unit: - Work Item: Provision of adequate sheeting, shoring, and bracing, or equivalent method, for the protection of life and limb in trenches and open excavation.

NAICS Classification

NAICS 237110 – Water and Sewer Line and Related Structures Construction, NAICS 238910 – Site Preparation Contractors

Records and Due Date

This bid opportunity was entered into BidAmerica on January 9, 2026, and was last updated on January 8, 2026. All bids and/or proposals are due on December 10, 2025.

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Legal Disclaimer

All bidders are responsible for reviewing and verifying all official bid documentation directly from the issuing agency. BidAmerica aggregates public bid information for advertisement purposes for contractors and government agencies convenience. This Notice of Invitation to Bid is for reference purposes only and is not an official or complete representation of any documents issued by Napa Sanitation District. BidAmerica does not guarantee the accuracy, completeness, or timeliness of any information displayed and shall not be held liable for any errors, omissions, misinterpretations, or damages resulting from reliance on this summary. Contractors must obtain all official information—including plans, specifications, addenda, deadlines, submission requirements, qualifications, and bidding conditions—directly from Napa Sanitation District prior to bidding.