(a) General rule.--Municipality or municipal authority standards for lateral connections located on private property and connecting to public infrastructure owned by a municipality or municipal authority that were in effect on January 1, 2005, and contain provisions that equal or exceed the requirements of the regulations promulgated under this act, the Internal Residential Code or under the International Plumbing Code shall remain in effect until such time as any such provisions fail to equal or exceed the minimum requirements of the regulations promulgated under this act, at which time the standards shall be amended to equal or exceed the minimum requirements of the regulations promulgated under this act.

(b) Filing requirement.--Municipality or municipal authority standards qualifying under subsection (a) shall be filed with the department and any local governments served by the municipality or municipal authority with such standards.