Pencemaran logam berat yang terdapat di perairan dapat berasal dari kegiatan pembuangan limbah rumah tangga, transportasi dan aktivitas industri. salah satu logam berat yang bersifat toksik adalah logam kromium (cr). keberadaan logam berat kromium yang terdapat di perairan dan sedimen dapat menjadi polutan apabila konsentrasinya melebihi ambang baku mutu yang ditentukan. tujuan dari penelitian ini adalah untuk menganalisis kandungan logam berat kromium (cr) yang terdapat di perairan juata permai kota tarakan. parameter yang di uji yaitu sampel air dan sampel sedimen terkait logam kromium (cr) serta parameter kualitas air meliputi suhu, ph, dan salinitas yang di ambil pada lima titik stasiun dengan metode purposive sampling kemudian di analisis menggunakan metode spektrofotometri serapan atom (aas). hasil analisis menunjukkan bahwa nilai kromium (cr) yang terkandung pada air dan sedimen di lima stasiun penelitian masih berada di bawah limit deteksi yaitu

Transportation, industrial activity, and the disposal of domestic garbage are all pontential soucers of heavy metal pollutionin waterways. chromium is one of the harmfull heavy metals (cr). if the concentration of the heavy metal chhromium in the waterways and sediments exceeds the designated quality standart level, it might be considered a contaminant. the purpose of this study was to examine the heavy metal chromium (cr) level in the juata permai waters of tarakan city and to ascertain the relationship between aquatic ambient variables and water quality indicators (cr). water quality indicators such as temperature,ph, and salinity were measured using the aas method from samples of waterand sediment that were collected at five station sites. the analysis’s finding revealed that the amount of cr in the water and sediment at the five research stations was still less than detection threshold, which was 0.028 mg/l. the result of analysis also showed that according to government regulation no. 22 of 2021 and national oceanic atmospheric administration (noaa) in 1999. the heavy metal level of chromium (cr) in sediments was still below the quality standard value for chromium (cr) in water. keywords: heavy metal., chromium (cr)., water., sediment., quality standard