U radu je prikazana kakvoća vode potoka Črnec na području Sesveta prema pokazateljima režima kisika, hranjivim tvarima i mikrobiološkim pokazateljima. Iz rezultata petogodišnjeg monitoringa pokazatelja kakvoće vode načinjena je klasifikacija vode prema Uredbi o klasifikaciji voda. Uzorkovanje potoka Črnec obavljeno je na dva mjesta (gornjem i donjem toku). Vode potoka Črnec u gornjem toku uglavnom su treće vrste prema režimu kisika i hranjivim tvarima, a četvrte vrste po mikrobiološkim pokazatelji, dok je voda u donjem toku pete vrste po režimu kisika, hranjivim tvarima i mikrobiološkim pokazateljima. Prema ovim pokazateljima kakvoće površinske vode potok Črnec se može smatrati otpadnom vodom..; This paper presents water quality of the stream Črnec in the Sesvete area based on indicators such as oxygen regime, nutrients and microbiological indicators. According to water quality monitoring data from a five-year period, a water classification was made in line with the Regulation on Water Classification. The sampling of the stream Črnec was carried out in two points (in the upper and lower flow). The water in the upper flow is mostly of class III based on oxygen regime and nutrients and of class IV based on microbiological indicators, while the water in the lower flow is of class V based on oxygen regime, nutrients and microbiological indicators. According to these quality indicators, the water of the stream Črnec can be considered wastewater.