[4] "Contaminated" was written by Banks, Brandon Treyshun Campbell and Kevin Garrett and produced by BJ Burton.
[6] Gabriel Aikins from Substream Magazine referred to the song's sound as a "haunting mix" of instruments and Burton's production.
[7] Rania Aniftos from Billboard said the song used a "heavy synth-based melody" alongside Banks' airy vocals.
[9] An accompanying lyric video was released in support of the single on August 21, 2019 to Banks' Vevo channel on YouTube.
[12] Nina Corcoran from Consequence of Sound noted how Banks performed with "her trademark vibrato" which contrasted with the song's lyrical content.