MO SB1427

Amends Missouri water pollution laws (sections 644.051 and 644.082) to remove "water contaminant" from permit requirement language, narrowing the permit requirement to only "point sources" and wastewater treatment plants

Establishes mandatory buffer distances for commingled offsite industrial wastewater storage facilities from public buildings and residences: 1,000 feet for facilities over 500,000 gallons up to 5 million gallons; 2,000 feet for 5-10 million gallons; 3,500 feet for over 10 million gallons

Requires annual third-party laboratory testing of commingled offsite industrial wastewater storage basins for heavy metals (arsenic, aluminum, barium, cadmium, chromium, copper, lead, mercury, selenium, silver, thallium) and bacterial contamination (E. coli and fecal coliform)

Grandfathers existing facilities with valid operating permits as of July 9, 2024, exempting them from new buffer distance requirements; also exempts facilities with written agreements from affected property owners

Requires the department to establish chain of custody procedures for testing samples and mandates groundwater monitoring when geological features increase contamination likelihood