It looks most like a soldier fly larva in the family stratiomyidae. Your guess that it came up the drain from the septic tank is very possible.
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Larvae are dark brown torpedo shaped and flattened.
Black soldier fly larvae in septic tank. Known as drain fly larvae the black creatures are a warning sign of a build up of waste in the toilet drain as they feed off the hair and sludge that coats the underground pipes. The team tested the optimal environmental conditions in terms of temperature and humidity for black soldier fly larvae bsfl to reduce the amount of human feces in waste septage. They are eating what is in there.
Please don t do anything to get rid of these larvae. They are a sign of a healthy tank. Studies around the world have shown that bsfl are voracious consumers of organic waste in septage and convert this to body mass.
Black soldier fly larvae photo by g. This is a fly larva though we cannot say for certain which family. If you have an interest in faecal sludge management then you have probably heard of black soldier fly larvae bsfl.
See this image on bugguide. I keep finding these black soldier fly larvae in my house too. A licensed pumper will likely use his own hose and pump setup.
The key to soldier fly identification is the presence of its distinctive larvae. I wonder if it is just because of the season and if they will go away once it gets warmer. So i m hoping that is what is happening and they will go away.
You would have to provide a way out for the maturing larvae or the adult flies if the larvae can pupate in the tank. This will be where many of the worms and other burrowing insects will live. The larva grows to over one inch in length.
The flies require bright light to breed. I notice different bugs appear during different times of the year. These would be the mature larvae migrating to find a dry place to pupate.
Step 4 use a high pressure washer to liquefy and dislodge the two three inches of sludge and sediment on the bottom of the tank. Blog post by heather purshouse. I like the tips you gave though for getting rid of them.
These bugs have attracted the interest of wash specialists due to their widespread distribution in the tropics and emerging use in organic waste management. The larvae and pupae of the soldier fly are distinctive in appearance and are key in identifying this type of fly. I have seen a couple of reports of bsfl coming up through a toilet connected to a septic tank.
This removes many of the insects eggs and larvae from the septic tank. Many horse flies have aquatic larvae but this does not look like a horse fly larva.
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