If the plan had worked out, it might have meant a huge windfall for state finances. But opponents worried Colorado could have been locked into a bad deal.
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The district is seeking a $23 million a year reduction in its contribution to PERA.
Of those original 10, six of the bills have passed or are close to passing.
If the bill becomes law, Colorado would be among the few states to give express permission for victims to sue schools for negligence.
The House speaker, a Democrat, is pushing an effort to let the state keep money it would otherwise have to send back to taxpayers.
The Republican-controlled state Senate committee defeated the measure Wednesday evening on a party line vote.