Lead & Copper Rule Revision (LCRR) Resources are listed below in order to help water systems and their water operations specialists in Minnesota better understand the LCRR and what comes next. Lead & Copper Rule Revision ResourcesReview of the National Primary Drinking Water Regulations Lead & Copper Rule Revisions (EPA)Lead & Copper Rule Revisions (MDH)Lead & Copper Rule Overview (NRWA) MRWA LCRR Training Available on our Training CalendarDrinking Water Revolving Loan Fund General Information (MDH)