Lead and Copper Rule

The purpose of the Lead and Copper Rule (LCR) is to protect public health by minimizing lead and copper levels in drinking water. Lead and copper enter drinking water mainly from corrosion of lead and copper containing plumbing materials. The rule establishes action levels (AL) for lead and copper based on a 90th percentile level of tap water samples. An action level exceedance is not a violation but triggers other requirements to minimize exposure to lead and copper in drinking water, including water quality parameter monitoring, corrosion control treatment, source water monitoring/treatment, public education, and lead service line replacement. All community water supplies and nontransient noncommunity water supplies are subject to the LCR requirements.

General Information

Michigan Safe Drinking Water Act 399  
Michigan Safe Drinking Water Rules - Supplying Water to the Public

Types of Public Information Required Under Act 399 (PDF)

2018 Lead and Copper Rule Revisions 

Lead and Copper Tap Sampling

Sample Site Selection

Site selection criteria were updated in 2018 to place more emphasis on sites with lead service lines. Review the updated sample site selection criteria to confirm the sites in your sampling pool still meet proper tiering criteria.

Lead and Copper Sampling Plan (Sampling Pool)

Water supplies must submit to EGLE a Sampling Plan that contains a pool of properly tiered lead and copper tap sampling sites.

Sampling Plan Instructions and Guidance


Sampling Plan Forms

Tap Sampling Checklist

To avoid missing steps or deadlines, use this checklist as you prepare for and conduct lead and copper tap sampling and report results to EGLE.

Sampling Instructions

Samples MUST be collected according to very specific instructions.  Water supplies may use the following instructions to inform operators and/or homeowners on proper sample collection

Sites WITHOUT lead service lines

Sites WITH lead service lines

Lead and Copper Report and Consumer Notice Certificate

Water Quality Parameter (WQP) Tap Sampling

Use these WQP report templates to report sampling results to EGLE. Choose the appropriate template based upon whether or not your system has corrosion control treatment.

  • Water Quality Parameter Report for Systems WITH Corrosion Control Treatment (PDF) and (Word)
  • Water Quality Parameter Report for Systems WITHOUT Corrosion Control Treatment (PDF) and (Word)

Distribution System Materials Inventory (DSMI)

Preliminary DSMI Information 

Preliminary Distribution System Materials Inventories: Summary Data by Water Supply

April 2019 - Preliminary Distribution System Materials Inventory Memo (PDF)

Preliminary DSMI Videos

Preliminary DMSI Forms

Complete DSMI Information 

Complete Distribution System Materials Inventory (CDSMI) Overview

Minimum Service Line Materials Verification Requirements


Service Line Information

Building owner/occupant service line material notification

Training Materials

Michigan Lead and Copper Rule Webinar Series for Drinking Water Operators

  1. Site Selection/Sampling Plans (Recorded 04/20/2021, 1 hr. 29 min.)
  2. Sampling (Recorded 05/04/2021,  1 Hr 20 Min)
  3. Reporting (Recorded 05/25/2021, 1 hr. 13 min)
  4. Overview of Service Line Replacement and CDSMI-Minimum Services Line Material Verification Requirements (Recorded 9/9/2021, 1 hr. 37 min)
  5. All Things Water Quality Parameters (WQPs) (Recorded 9/14/21, 1 hr. 26 min.)
  6. Lead and Copper Rule (LCR) Compliance Reporting  (recorded 9/21/2021, 1 hr. 15 min.)

Additional information