California began restricting lead in new plumbing in the mid-1980s, in step with the federal ban that Congress passed in 1986. A much tougher state law took effect on January 1, 2010, cutting the allowable lead content in pipes, fittings, and fixtures from 8% to a weighted average of 0.25%. So the short answer to when lead pipes were banned in California is twofold: new installations of lead pipe and lead solder were prohibited in 1986, and the stricter modern definition of “lead free” has applied since 2010. Homes built before those dates can still have lead in their plumbing.
The 1986 Ban on New Lead Plumbing
Congress amended the Safe Drinking Water Act in 1986 to prohibit pipes, solder, and flux that were not “lead free” in any public water system or in plumbing connected to one.1Office of the Law Revision Counsel. 42 US Code 300g-6 – Prohibition on Use of Lead Pipes, Solder, and Flux California adopted matching restrictions under Health and Safety Code Section 116875. The definition of “lead free” at the time was loose by current standards: solder and flux could contain up to 0.2% lead, and pipes and fittings could contain up to 8%.2Justia Law. 2005 California Health and Safety Code Sections 116875-116880
These rules stopped new lead pipe installations going forward, but they did not pull out the lead service lines and lead-soldered copper joints already in the ground. Any home, school, or business built before 1986 can still be served by plumbing that contains meaningful amounts of lead.
AB 1953 and the 2010 California Standard
Assembly Bill 1953 rewrote the definition of “lead free” in Section 116875. Starting January 1, 2010, the allowable lead content for the wetted surfaces of pipes, fittings, and fixtures sold in California dropped from 8% to a weighted average of just 0.25%. The 0.2% ceiling for solder and flux stayed in place.3California Legislative Information. AB-1953 Lead Plumbing
The weighted average looks at every component of a pipe or fixture that touches water, multiplies each one’s lead content by its share of total wetted surface area, and sums the results. In practice, manufacturers had to reformulate nearly every faucet, valve, and fitting sold for California drinking water use. The law also prohibited the sale of plumbing supplies that failed the standard and required clear labeling on any non-lead-free solder or flux still in commerce.2Justia Law. 2005 California Health and Safety Code Sections 116875-116880
California was ahead of the federal government on this change. The Reduction of Lead in Drinking Water Act, signed on January 4, 2011, adopted the same 0.25% weighted average standard, but the federal version did not take effect until January 4, 2014.4Congress.gov. Public Law 111-380 – Reduction of Lead in Drinking Water Act
Why Older Homes Can Still Have Lead
A ban on new lead plumbing does not remove the lead that was legally installed before the ban. In California, the two things to look for in older homes are lead solder in copper pipe joints and, less commonly, lead service lines connecting the home to the water main. Lead solder was in routine use in copper plumbing until the 1986 ban, so homes built before then are the most likely to have it. Lead service lines are rare in California; as of January 2026, the state reports no known lead service lines in its public water systems.
Lead is harmful at any exposure level, and the EPA has set its health-based goal for lead in drinking water at zero.5United States Environmental Protection Agency. Basic Information about Lead in Drinking Water The danger is greatest for young children: even low blood lead levels have been shown to reduce IQ, attention span, and academic achievement in children under six.6U.S. Environmental Protection Agency. What Are Some of the Health Effects of Lead in Children Water that has been sitting in pipes for several hours, such as overnight or during a workday, is more likely to carry elevated lead because it has had prolonged contact with the plumbing.
What To Do If Your Home May Have Lead Plumbing
If your house was built before 1986, or you simply are not sure what is behind the walls, a few steps help you find out what you have and reduce exposure in the meantime.
- Ask your water utility about your service line. Utilities are building inventories of service line materials and should be able to tell you whether your connection is lead, copper, galvanized steel, or something else.
- Test your tap water. A certified laboratory can test a sample for lead, with fees typically running from about $40 to $100. Your water utility may also offer free or discounted testing. You can contact the State Water Resources Control Board or your local utility to request current monitoring results for your water system.7California State Water Resources Control Board. Lead and Copper Rule for Drinking Water
- Flush the tap before drinking. If water has sat in your pipes for more than a few hours, run the cold tap for 30 seconds to two minutes before using it for drinking or cooking.
- Use cold water for food and drinks. Hot water dissolves lead from plumbing more readily than cold water. Never use hot tap water for cooking, baby formula, or beverages.
If you have young children at home or you are shopping for a child care facility, note that licensed child care centers in buildings constructed before January 1, 2010, are required under California law to test their drinking water for lead and to retest every five years.8California State Water Resources Control Board. Childcare Center Lead Sampling Program You can ask any licensed provider to show you the results.