In response to the Flint, Michigan water crisis, EPA published revisions to the Lead and Copper Rule on January 15, 2021 addressing testing, pipe replacement and related issues. The rule mandates additional requirements for sampling tap water, corrosion control, public outreach and testing water in schools. The rule continues the requirement for replacement of lead service lines when the "action level" for lead is exceeded, but requires that a utility replace at least 3 percent of its lines annually, compared to 7 percent under the prior regulation. Several citizen and environmental groups immediately filed lawsuits challenging the rule. On March 12, 2021 EPA delayed the effective date of the rule to June 17, 2021.