Speaking at the association's centenary conference, Paul Smith, headmaster of Hereford Cathedral School, will highlight the risks he believes are faced by schools that educate the UK's cathedral and collegiate choristers.
Mr Smith will say: "I wish I could add that today proper forethought, planning and insight would never allow a repeat of such concerns amongst our membership, and that the values and principles upon which our schools are based are much better understood and appreciated by legislators and politicians.
"I wish I could say that, but I suspect that the risks to our CSA schools today, are as great, if not greater, than they were in 1918."
One of the concerns he will raise is about the Government's attitude towards independent schools, which include the majority of choir schools.
In his address at the conference in St Paul's Cathedral, Mr Smith is expected to say: "For those of us in the independent sector, there can be little doubt that we have few friends at the moment.
"Politicians, of all shades, seem hell bent on issuing ill-informed edicts, based upon lazy stereotypes, which purportedly seek to ensure the independent sector does its bit to justify charitable status.
"The independent sector is an embarrassment to governments, because their schools have the audacity to invest and nurture in a broad holistic education, not a narrow results driven curriculum and in doing so independent schools highlight the ill effects of a continuous stream of reforms imposed upon the state sector."
It is also thought that Mr Smith will highlight the detrimental effect of initiatives such as the EBacc, combined with financial cuts on music and arts provision for state school pupils.
The final threat he identifies to choir schools that are fee-paying is financial.
He will tell the conference: "The common model today is for choral foundations to support the education of choristers in fee paying choir schools. CSA is proud to be able to help administer, and actively support, the funding of those choristers in financial need.
"However, with school fees rising year on year, and congregational numbers falling year on year, with the ever increasing costs that cathedrals, chapels and churches face, I cannot see how they are going to be able to continue to financially support choristers."
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