Yes, But It's Uncommon
Tubal ligation is one of the most effective forms of birth control available, with a first-year failure rate under 1%. Over a full lifetime, the cumulative failure rate is estimated at around 1 in 200 — low, but not zero, which is an important distinction from thinking of it as a guarantee.
Why It Can Fail
Failure typically happens one of a few ways: the tube can recanalize (reopen a natural passage over time), a clip or ring can shift or fail to fully close the tube at the time of surgery, or, very rarely, a fistula can form that allows an egg and sperm to meet despite the blockage. Technique matters here — clips and rings have somewhat higher long-term failure rates than cautery-based methods in some studies, while bilateral salpingectomy, which removes the tubes entirely, has the lowest failure rate of all because there's no tube left to recanalize.
Age Matters
Younger age at the time of the procedure is consistently associated with a higher cumulative failure rate, simply because there are more years during which pregnancy remains statistically possible. This is one reason some providers discuss reversible alternatives more thoroughly with younger patients.
The Ectopic Pregnancy Risk
This is the part that deserves the most attention. If tubal ligation fails and pregnancy occurs, there is a meaningfully elevated relative risk that the pregnancy will be ectopic — implanted outside the uterus, most often in the remaining tube — compared to pregnancies in the general population. Ectopic pregnancy is a medical emergency. Anyone who has had a tubal ligation and experiences a missed period, pelvic pain, or other pregnancy symptoms should seek prompt medical evaluation rather than assuming pregnancy isn't possible.
What This Means for Your Decision
A very low failure rate is still a real number, not a rounding error, and it's worth factoring into your decision — particularly the ectopic pregnancy risk, which is the more serious consequence of failure. This isn't a reason to avoid the procedure for most candidates, but it is a reason to stay alert to pregnancy symptoms afterward and to discuss technique-specific failure rates with your surgeon.