Can you flush tampons down the toilet when using a septic tank?

You cannot flush tampons down any toilet.

Although tampon manufacturers claim their products are flushable they say this to make their products seem more convenient and don't care about what they can do to the sewage system: blocking the toilet or pipes further-up the system, which can cost billions per year for water authorities to fix. Furthermore tampons can bypass sewage treatment and make it into the sea.

Always wrap-up your tampons and throw in the bin.