Safe drinking water is a fundamental concern for public health. When tap water flows through aging household plumbing systems, potential health risks may emerge. In the East Bay Municipal Utility District (EBMUD), galvanized iron service lines installed decades ago have become a growing focus due to their material properties and possible lead contamination risks.
Prior to 1960, EBMUD periodically installed galvanized iron or steel service lines. However, due to inherent flaws and health concerns, the utility discontinued their installation and now actively removes existing galvanized pipes during routine maintenance, such as leak repairs or mainline breaks.
These rigid galvanized pipes were originally connected to water mains using short, flexible connectors called "pigtails" or "goosenecks." Notably, pigtails installed before 1928 in EBMUD's service area were typically made of lead. After 1928, copper became the standard material, though lead was temporarily reintroduced during World War II (1942-1945) due to copper shortages.
As of early 2025, approximately 200 remaining galvanized service lines in EBMUD still use lead pigtails, with about 800 using copper connections. While EBMUD maintains roughly 385,000 service lines total, galvanized pipes now represent less than 0.3% of the system. The utility plans to replace all lead-pigtail galvanized pipes by 2027.
Though durable, galvanized pipes gradually lose their zinc coating over time. Once this protective layer erodes, the underlying iron begins to rust, forming corrosive deposits that can eventually cause leaks. Corrosion occurs unevenly, creating discrete nodular protrusions called "tubercles" that restrict water flow and reduce pressure. Older, corroded pipes may also discolor water.
While zinc constitutes the primary coating material, it may contain contaminants like lead and cadmium. Furthermore, if galvanized pipes connect to lead components, lead-containing scale can form inside the galvanized piping. This scale may flake off or dissolve over time, releasing lead into the water supply.
In the East Bay, most homes built after 1960 don't contain galvanized pipes. Homeowners can inspect their plumbing using a simple magnet test—only iron pipes attract magnets. For non-magnetic pipes, gently scrape the surface to reveal the base material: plastic pipes appear white, gray, black, or blue; copper shows a penny-like color; galvanized iron remains dull gray; and lead reveals a shiny silver surface when scraped.
In some cases, lead released from lead pipes can form scale deposits inside galvanized pipes. Over time, these particles may detach and enter drinking water. Cities like Washington D.C. have detected elevated lead levels in homes even after lead service line removal, attributed to this release mechanism. However, EBMUD's water system hasn't exhibited similar lead release patterns.
EBMUD historically maintained about 7,500 lead service lines, all now removed. Following EPA regulations, the utility inspected locations where lead pipes previously connected to identify any remaining galvanized plumbing on customer properties. Affected homeowners have been notified, with these locations marked on EBMUD's service line inventory map.
While EBMUD hasn't observed lead release from galvanized pipes in its system, water testing remains the most reliable risk assessment method. The utility has collected hundreds of samples from galvanized pipes connected to lead components, with 90% showing lead concentrations below 1 part per billion (ppb).
- Faucets and valves: Many contain brass components, which may include lead. While "lead-free" standards have tightened since 1986, pre-2010 fixtures may contain up to 8% lead by weight.
- Solder: Copper pipe joints installed before 1986 often used 50% lead solder. Modern solder contains no more than 0.2% lead.
Since lead is tasteless and invisible, testing provides the only reliable detection method. EBMUD offers annual free lead testing for customers.
EBMUD currently maintains no lead service lines. During WWII copper shortages, the utility installed approximately 7,500 lead lines, with removal beginning in 1945. By 2000, 97% had been replaced, and thorough record reviews confirm all lead service lines have now been eliminated.
For the approximately 200 remaining lead pigtails connecting galvanized pipes, EBMUD provides water filters during replacement and conducts post-installation water testing. These locations are included in the service line inventory.
- Conducting regular water tests
- Flushing pipes after periods of inactivity
- Cleaning faucet aerators regularly
- Using NSF/ANSI Standard 53-certified water filters when appropriate
The EPA designation "GRR" (Galvanized Requiring Replacement) identifies galvanized pipes downstream from former lead service lines. While EBMUD hasn't observed lead release from these pipes, the utility tags affected locations and advises proper flushing protocols during plumbing work.
During 2023-2024, EBMUD contractors inspected approximately 10,000 service lines at locations with historical lead pipe connections, complying with new federal regulations. The utility's testing confirms no lead in its delivered water.