pfas_rule_impact

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Compares two rule scenarios in the MORVS PFAS Drinking-Water Register: 2024_as_published (EPA's six 2024 PFAS drinking-water limits, final and in force) and if_proposals_final (the PFOA and PFOS limits only, as they would stand if EPA's May 2026 proposals to rescind the PFHxS, PFNA, HFPO-DA and Hazard Index limits became final; they are proposals, not final rules). Returns each rule record with its status label, the number of systems and the ECHO population served with at least one UCMR 5 sampling-location average at or above a scenario limit's comparison cutoff (EPA Table 4 method), the PWSIDs whose only such averages are against limits proposed for rescission, the largest matching systems by population up to limit, the register's published figures for comparison and the method version, optionally filtered by state file, owner type and minimum population. These are technical comparisons of monitoring averages, not compliance results (not_compliance: true).