I think if you show them your diapers, explain where they'll keep the dirties, and ask, that most will comply. Our center said that they had to check with the DPW and since there were no regulations against it, they agreed to use them. I know The Children's Garden, The Children's Family Center at Messiah Village, and The Goddard School in Mechanicsburg have all agreed to use them.
Re: Central PA Cloth Diaper mamas....
TTC since Jan 07. Dx with PCOS Jan 08
We only looked on the East Shore, but U-Gro at Tecport, Discovery Kids on Rt. 441 and Aa to Zz off Derry St. each said they'd work with cloth diapers.
Good luck!