Tambak merupakan salah satu jenis habitat atau ekosistem buatan manusia berupa kolam yang berada di daratan sekitar pantai dengan kondisi air bersifat payau. kualitas air tambak sebagai salah satu dasar penentuan kesesuaian terhadap organisme yang akan dibudidayakan. tujuan penelitian yakni menganalisis kualitas air tambak melalui parameter fisika berupa total suspended solid (tss) dan total dissolved solid (tds) di perairan tambak kepiting soka (soft crab) kampung empat kota tarakan. metode uji parameter tss dan tds menggunakan gravimetri dengan baku mutu air kelas iii menurut peraturan republik indonesia no. 22 tahun 2021 tentang penyelenggaraan perlindungan dan pengelolaan lingkungan hidup. pengambilan sampel dilakukan 5 kali pengulangan selama satu bulan. hasil penelitian menunjukkan kandungan tss berkisar antara 52 - 216 mg/l. sedangkan kandungan tds berkisar antara 14.105 - 26.965 mg/l. kisaran nilai kandungan tss dalam keadaan kurang baik dan untuk tds telah melebihi standar baku mutu air di bandingkan standar baku mutu air kelas iii menurut peraturan republik indonesia no. 22 tahun 2021 tentang penyelenggaraan perlindungan dan pengelolaan lingkungan hidup. kata kunci: kota tarakan, tambak, kualitas air, tss, tds

Ponds are one type of habitat or man-made ecosystem in the form of ponds located on the land around the coast with brackish water conditions. pond water quality is one of the basis for determining the suitability of cultivated organisms. the purpose of the study was to analyze pond water through physical parameters in the form of total suspended solid (tss) and total dissolved solid (tds) in the waters of soft crab ponds, kampung empat, tarakan city. the parameter test method of total suspended solid (tss) and total dissolved solid (tds) applied gravimetry with class iii water quality standards according to regulation of the republic of indonesia no. 22 of 2021 concerning the implementation of environmental protection and management. the sampling was repeatedly taken 5 times for one month. the results showed that total suspended solid (tss) content ranged from 52 - 216 mg/l. meanwhile, total dissolved solid (tds) content ranged from 14.105-26.965 mg/l. total suspended solid (tss) and total dissolved solid (tds) have exceeded the quality standard limit for total suspended solid (tss) and total dissolved solid (tds) according to class iii physical parameter tss 100 mg/l and tds 1.000 mg/l. required by regulation of the republic of indonesia no. 22 of 2021 concerning the implementation of environmental protection and management. keywords: tarakan city, pond, water quality, tss, tds