Correctly, it is considered as hazardous waste and it is a VOC, to boot. 
Even more important are the resins in your tester column. These contain 
all the nasties you have measured off your boards including heavy 
metals. Disposal down a drain is strictly illegal: if it meets a hot 
water stream, the IPA will evaporate preferentially and an explosive 
mixture with air could form in the sewer, with the potential of causing 
a flash. Incineration is OK if you can find someone you can rely on to 
handle it correctly, but it should not be mixed with fuel oils as the IP 
will dissolve in the oil and a puddle of water will stay in the bottom 
of the tank. If the latter is cheap mild steel (as most are) it will 
rust through quite quickly, even if galvanised.

As the quantities are small, I know some have successfully added it to 
the first rinse water of their cleaning machines, ignoring VOC emissions 
and flammability hazards!

Brian



Phil Nutting wrote:
> Hey Technetters,
> 
> It just occurred to me that in using the alcohol/DI water mix for determining the cleanliness of a circuit board, somewhere along the line this becomes a waste fluid and needs to be disposed.  What are your disposal methods?  I'm sure the local waste water folks would look poorly on alcohol being added to the waste stream... unless it was Johnny Walker Black or Stoli in their pockets.
> 
> Phil Nutting
> 
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