In this study, we examine the Bureau of Labor Statistics data to compare the costs to districts for teacher health insurance with similar costs to private-sector employers. We find that insurance costs for teachers are 26 percent higher than they are for private-sector professionals, and this is partly explained by greater unionization in the public sector. We also examine data newly available from Wisconsin to quantify the impact of that state’s recent change in collective bargaining law: we find a reduction in district costs of 13 to 19 percent, the result of lower-cost policies and higher teacher contributions.