jefffalcone
Contributor
Irregardless of what a course's standards require, to dive, and to be safe about diving, you should be able to swim. There are potential circumstances where not knowing how to swim would create a risk. I am assuming of course that your interest is in obtaining an open water certification.
SSI's current standard for Open Water Diver is either a 200 yard surface swim or a 300 yard surface swim with mask, fins, and snorkel. In addition you must be able to perform a 10 minute survival swim/float without mask, fins, snorkel or any other swimming aid. Standards can vary by agency.
http://www.ssila.com/pdf/SSI_TrainStnd_0706.pdf
Irregardless your views on swimming and diving, irregardless is not a word.
Sorry, I couldn't resist.