US lawMichiganRegulationsDepartment — Environment, Great Lakes and EnergyBureau — Drinking Water and Environmental Health DivisionR 325.1601 to 325.1781 — Groundwater Quality Control Rules325.1657aR 325.1657aR 325.1657a Pump installation; well caps and seals.Last amended: 1994Year: 2026Length: 28 wordsOfficial source Cite as Mich. Admin. Code R 325.1657aRule 157a. Well caps and seals shall be weathertight and vermin-proof, provide venting pursuant to the provisions of R 325.1657, and be tightly secured to the well casing.PreviousR 325.1657NextR 325.1658