Conclusion. Though the controversies regarding tap water may have been exaggerated in many cases, it's safer for your dog to drink filtered tap water over direct tap water or bottled water. The bottom line is if you won't drink that water then don't give it to your dog either.
30S 90E = None of the above. It's in the Indian Ocean (They could have meant 30S 90W. That's in the Pacific Ocean, which is on the list but hasn't been used).