Yes, you're right, a lot of the pump stations were constructed pre-1977, so they're 30 to 45 years old. These old water pumps are actually fish-unfriendly, which means that when the pumps are turned on, any living creature behind it—amphibians and fish alike—are dragged through the pumps and ground up. That's a big concern in terms of any potential living thing behind the pumps.
On November 30th, 2016. See this statement in context.