Lead and Copper Rule (LCR) for Drinking Water

Rule, Revisions, and Improvements

The purpose of the federal Lead and Copper Rule (LCR), Revisions (LCRR), and Improvements (LCRI) is to protect public health by reducing lead and copper levels in drinking water. Lead and copper can enter drinking water through disturbance or corrosion of lead and copper plumbing materials. Public water systems are required to monitor and take various actions to minimize lead and copper levels at consumers' taps.

Regulatory Background

Regulatory Background

Learn about the Lead and Copper Rule, Revisions, and Improvements and its history.

Learn More About the Rule

Resources for Water Systems

Resources for Water Systems

Access resources for lead service line inventories, public notification, and LCRR compliance.

View Guidance and Templates

Public Health Information

Public Health Information

Learn about lead exposure, lead poisoning prevention, and other topics on consumer safety.

Learn About Health Impacts


  • The U.S. Environmental Protection Agency maintains the October 16, 2024, LCRR compliance date for the lead service line inventories. All community and non-transient non-community water systems must complete and submit an initial inventory, even if all service lines are identified as non-lead.
  • Water systems are to keep their current tap sampling plans until the LCRR comes into effect on October 16, 2024.

Contact Us

Please submit questions and inventory workplans to the LCRR Unit at DDW-LSLReports@Waterboards.ca.gov

Office Hours
The LCRR Unit hosts virtual office hours for water systems each week on Wednesdays from 9am – 10am and Thursdays from 2pm – 3pm. Staff will be available to answer questions about developing and submitting the LCRR Initial Lead Service Line Inventory. Sign up for a session using the LCRR Office Hour Jotform. Note: The session will close early if there are no attendees 15 minutes after the start time.

  Language Access Services

To request services in any language, click on “Request Language Services” to open the language access form.

The form is available in English, Español (Spanish), Tagalog, 中文 (Simplified Chinese), 한국인 (Korean), Tiếng Việt (Vietnamese), ਪੰਜਾਬੀ (Punjabi).