If you're the squeamish type, you may not want to know this, but snakes can get into your toilet, and we're not talking about plumbing augers. When you're using the toilet, the only thing between you and the sewer is about 10 inches of water, and many types of snakes can slither through that. It may help to know it happens rarely, and most snakes that can navigate water pipes are small and nonvenomous.
Dropping from the Sky
If you think the sewer system connected to your toilet is a closed system, one glance to your roof is all you need to convince yourself otherwise. There is a direct path from the opening of the vent stack on your roof to the main sewer, and the vent often curves before it connects to the soil stack. It isn't inconceivable for a snake to climb into the vent, fall to a place that the vent curves and crawl from there into a waste line on the upper floor. Creepy and unlikely as this scenario is, it's possible.
Slithering From Below
If you do have the misfortune of one day opening the toilet lid to find a snake staring at you, it's more likely it came from the sewer pipes. A loose cover on your septic tank or a break in the sewer line can provide the necessary access, and while it's unlikely for a snake to crawl through vertical pipes to an upper bathroom, the critter could emerge from a toilet on the ground floor. Far from being fantasy, this has occurred on more than one occasion. It isn't just snakes that come through the sewers, but frogs, rats and even lizards.
Probably Not a Cobra
The sight of a snake in the toilet is bound to unnerve you, and you may be tempted to simply run out of the bathroom. If you do that without closing the toilet lid, however, you're inviting the intruder to climb out of the toilet and hide. Although the chances of it being poisonous are slim to nonexistent, take a good look at the creature or have an expert examine it. Benign water snakes and garden-variety species, such as garter snakes -- which are the varieties you're most likely to encounter -- usually have long, angular bodies and small heads. Poisonous varieties, on the other hand, usually have thick bodies, triangular heads and small necks.
Snake-Proofing Your Toilet
If you've already had the experience of seeing a snake in your toilet and once was enough, or if you want to avoid the experience altogether, you may need to put a screen over the vent opening in the roof. If you do this, clean the screen periodically or your plumbing system may begin to exhibit the symptoms of poor venting, including slow draining and sewer smells. If you have a septic tank, be sure the lid fits tightly. It also doesn't hurt to take a careful look in the toilet before you use it.
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