Is stormwater or storm water the correct spelling?

Both "stormwater" and "storm water" are grammatically correct, but "stormwater" is the preferred spelling.

Here's why:

* "Stormwater" is the more common and generally accepted spelling, particularly in official contexts like government reports and scientific papers.

* "Storm water" is considered less formal and is often used in everyday language.

Ultimately, the choice is up to you, but "stormwater" is the more widely accepted and preferred spelling.