like most things once it's a large scale business somebody is going to look to cut corners. You don't do it directly. You just cut everybody's budgets until it happens "out of sight, out of mind". Heck, you don't even need to cut their budgets, just don't _raise_ them and wait for inflation to do it for you. At 2-5% every year that's a nice profit margin increase.
So you don't check/change the filtration equipment as much anymore. Your guys are working 16 hour shifts for 20% less than minimum wage 5 years ago thanks to inflation and driving them to work more hours. Suddenly stuff gets into the water that shouldn't. Maybe a few people get sick, maybe a few over 50 die....