> 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/nh4_n.md).

# nh4\_n

The concentration of NH4-N for a conventional system is typically 60 mg N/L (ranging between 17 and 78 mg N/L). The value varies greatly for different types of septic systems (see Table A-1 of Siegrist et al. (2005)).

#### References

> Siegrist et al. (2005)