Chomutovka does not have many tributaries and none is significant. The longest of them is Hačka, a 14.3 km long right tributary of the Chomutovka.[1]
Bodies of water
There are 141 bodies of water in the basin area. There are two small reservoirs in the area of the upper course, but the largest water bodies are around the middle course near Chomutov.[1] Novoveský pond, a small fishpond near the Chomutovka's spring, is the only body of water built directly on the river.
A 3-metre-high waterfall is located near Hora Svatého Šebestiána. It is a tourist destination to which a marked path leads.[2] About 1.5 km further down the flow there is a second waterfall with a height of 2 m.[3]
Before it reaches Chomutov, the river flows through the mountainous landscape of the Ore Mountains. Starting with Chomutov, it flows through a flat and predominantly agricultural landscape of the Most Basin. The slope of the terrain here is approx. 0.3–0.5%.[4]
Floods
There is an increased risk of flooding in the section between 23.0 and 31.8 river km, which includes the city of Chomutov and the village of Údlice.[4]
Protection of nature
A large area of Шаблон:Cvt in the spring area of the Chomutovka is protected as Prameniště Chomutovky Nature Reserve. The subject of protection are marshes and bogs, forest cover typical of these biotopes, and the occurrence of rare species of plants and animals.[5]
Another part of the upper course (before it reaches Chomutov) flows through a valley that is protected as Bezručovo údolí Nature Monument. It has an area of Шаблон:Cvt. The subject of protection is, among other, the occurrence of butterfly species dusky large blue and scarce large blue.[6]