Regulations, demographics, and power dynamics
Unfortunately, there’s a reason, and additionally, a pattern that will be hard to break. The susceptibility of a drinking water disaster for low income communities comes from their proximity to the treatment centers. Usually the water treatment centers reside in places that are both densely populated, and on a cheap plot of real estate (usually found in lower income communities). These components are selected because together they would make the job far more efficient (assuming large scale accidents were out of the question). Despite placing water treatment plants around the country to keep people safe, the selection process for the treatment center real estate turned out to disproportionately affect the impoverished. Not only that, but it was mass replicated and this tactic was done nationwide, causing water contamination disasters for low income communities across the country. It's hard to point fingers based on this evidence, because it really is just an unfortunate coincidence regarding real estate for the public water system itself.