The species has a large world range, occurring from France, Britain and Scandinavia through eastern Europe and Russia to China and Japan.

The distribution of Blomer's rivulet matches that of calcareous rocks, mainly in wetter parts of the country.

The species' British distribution covers two main areas – it occurs from Devon through Somerset, Wiltshire and Bristol to South Wales and the south-west Midlands, and then again from Derbyshire and Nottinghamshire through Yorkshire to County Durham.

However, despite having quite a wide geographical spread, the moth is afforded a status of Nationally Scarce (found in between 16 and 100 of Britain's 10 km squares).

The species is named after Charles Blomer, who was born in 1778 or 1779 and died in 1835, and studied insects (principally in Southwest England and South Wales) during the 1820s and 1830s.