> For the complete documentation index, see [llms.txt](https://swatplus.gitbook.io/io-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://swatplus.gitbook.io/io-docs/introduction-1/databases/septic.sep/org_n.md).

# org\_n

The concentration of organic nitrogen for a conventional system ranges between 9.4 and 15 mg N/L.