Can I flush dead fleas down the toilet?

Yes, you can flush dead fleas down the toilet, as flushing is an effective way to dispose of dead fleas, live fleas caught in water, and flea eggs collected during cleaning, because toilet water will carry them to sewage system where they cannot survive or return, and it prevents them from escaping from trash. When you comb pets with flea comb and catch fleas in bowl of soapy water, which drowns fleas, you can flush the soapy water with dead fleas down toilet. Similarly, dead fleas collected in tissues after crushing can be flushed. Flushing is preferable to throwing dead fleas in trash where they could potentially escape if not sealed, though dead fleas cannot escape, live ones could. If you vacuum fleas, do not flush vacuum bag, dispose vacuum bag or canister contents in sealed plastic bag outside. For live fleas, soapy water kills by breaking surface tension and drowning, then flushing ensures disposal. Flushing dead fleas is safe for plumbing as they are tiny and will not clog toilet, unlike large amounts of diatomaceous earth or other materials which should not be flushed in large quantities. So yes, flushing dead fleas is acceptable and hygienic method of disposal, especially after flea combing pets, just ensure you flush with enough water and clean toilet afterward for hygiene.