"basic level of" is correct and usable in written English.
It is usually used to refer to a minimum or starting point. For example, "Everyone should have a basic level of understanding of mathematics."
Sorrentino has a basic level of fluency and verve.
I find the basic level of the audience.
But not even having a basic level of understanding?
In order to work well, markets need a basic level of trust.
By James Surowiecki In order to work well, markets need a basic level of trust.
He said the basic level of the expanded service, known as a silver membership, was free.
"Throughout my professional life, I've tried to maintain a basic level of privacy.
"We're trying to maintain at least a basic level of service".
It seems to be a film that evokes a very basic level of emotion".
In South Africa, 1.63 million people don't have access to a basic level of water supply.
Kabinett is the most basic level of ripeness, with higher levels of sugar indicated by spätlese, auslese and so on.
