Sorry I don't have an specific school suggestions but a blind friend of a friend was certified open water. She did her training on the Texas gulf-coast. You may want to consider a trainer who can certify for "black water" diving.
$1 The link is from SDI but I believe PADI and NAUI have similar certifications in their programs. This is training that applies to diving in water with zero visibility usually due to silt/mud but also some night, cave and wreck diving. Black water diving is a technical diving specialty and most of the people doing this specialty are commercial divers for oil rigs, water authorities, police divers, etc. There are many places teaching this type of diving, certainly not as many as basic open water but you should be able to find a place. The fireman I talked to who had this certification said that they did their pool training with a blacked out face mask and open water training in a muddy lake.