City of Ontario Awards Construction Contract to Mamco Inc (October 2026)

Ontario authorized a construction contract with Mamco, Inc. for the Fourth Street Storm Drain, Water Main, and Street Improvements Project. The contract is $12,292,292 plus contingency, for a total authorization of up to $13,521,521.

Document date · October 4, 2026

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Scope & details

The full contract record, as filed.

Contract amount

$12,292,292 plus 10% contingency of $1,229,229; total not to exceed $13,521,521

Contract type

CONSTRUCTION

Document type

Agenda

Source document

City of Ontario Agenda 2026-10-06

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Frequently asked questions

Common questions about this contract, answered from the record.

Who was awarded the construction contract by City of Ontario?

Mamco Inc was awarded this construction contract by City of Ontario, as recorded on October 4, 2026. The contract value is $12,292,292 plus 10% contingency of $1,229,229; total not to exceed $13,521,521.

How much is the Mamco Inc contract with City of Ontario worth?

The Mamco Inc contract with City of Ontario is valued at $12,292,292 plus 10% contingency of $1,229,229; total not to exceed $13,521,521, covering construction work.

What type of contract is this?

This is a Construction contract, documented as a agenda record, structured as a not-to-exceed (ceiling) agreement.

Where was this contract approved?

This contract appears in City of Ontario Agenda 2026-10-06 (Agenda), dated October 4, 2026 from City of Ontario. Civic IQ extracts contract records directly from agency meeting documents and solicitations.

What other contracts does Mamco Inc hold?

Mamco Inc may hold additional government contracts. View their full contract history, the agencies they serve, and total tracked spend on their Civic IQ vendor profile.

View Mamco Inc's profile

What is City of Ontario currently buying?

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