It's a response to municipality associations' requests. People appear to have forgotten that Trump's EPA created these rules in his first term. Here is a summary directly from the organization pushing for this.

https://www.awwa.org/AWWA-Articles/epa-announces-changes-to-...

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DaSHacka 17 hours ago | parent [-]

Trump's EPA introduces new rules: i sleep

Trump's EPA pulls back the rules they themselves introduced: "This is proof Donald Trump is trying to weaken this country"

	▲	trimethylpurine 17 hours ago \| parent [-]
		Yeah. LOL. They aren't even pulling them back, they are delaying them to allow time for municipalities to get funding and come into compliance.