From Tacoma Public Utilities (NOTE – Environix has not independently verified the claims made by Tacoma Public Utilities):
Updated Wednesday, May 18, 2016
To help inform how to best test and mitigate for the potential lead goosenecks in its system, Tacoma Water collected samples from 12 customers’ homes where we suspected lead goosenecks may be present.
The in-home sample results showed very safe lead levels, ranging from non-detectable levels to just over 4 parts per billion (ppb) – well below the regulatory action level for water of 15 ppb. (92% were less than 1 ppb)
For each home, three rounds of samples were collected from inside the home and one sample outside the home at the meter location near the street. Six of the 12 homes were discovered to actually have goosenecks when the service was dug up.
- Understand if lead is present at levels above the EPA action level
Identify sources of any detected lead, if possible
Verify recommended flushing procedures
Help identify if a lead gooseneck is present
Inform a broader plan for the remaining locations with potential lead goosenecks
What We Learned & What’s Next
- Tacoma Water is safe to drink. All 464 samples collected from within the homes are well below the EPA action level for lead.
- After reviewing multiple paper records – some from more than 100 years ago – along with multiple electronic records, the utility estimates the number of homes with possible gooseneck connections to be around 1,200.
- The results confirm that the utility’s corrosion control efforts are working. Corrosion control ensures that Tacoma’s water does not degrade the piping material it flows through.
- Similar to what we found when we sampled and tested at the four homes in early April, when the valve at the meter is opened and the plumbing is disrupted, particulates from the valve can come loose and be released into the water. Flushing the water after opening and closing the valve clears high levels of lead.
- Tacoma Water will offer water test kits to the 1,200 homes and businesses with a possible lead gooseneck connected to the water main. The kits will be available by July 1. Tacoma Water is contacting those customers directly with information about ordering a kit.
- Tacoma Water will remove lead goosenecks as expediently and efficiently as possible from its system. We anticipate it will take about five years to replace all of them. When it makes sense, the utility will coordinate to ensure the work coincides with other projects that require digging up the streets.
What You Can Do
- If you turn your water off at the meter, flush your pipes by running water for two minutes at an outside faucet if you have one, or the bathtub if not. Run the water with the faucet fully open.
If you haven’t used water for long periods of time (after going on vacation, for example), flush your pipes by running cold water at one tap for 30 second to two minutes (or until it is noticeably colder) before drinking or cooking. Taking a shower will flush your pipes.
Although Tacoma Water’s system fully complies with federal Lead and Copper Rule regulations, concerns about components installed in the early 1900s prompted special monitoring and testing beyond the regulation.
While Tacoma Water did not use service lines constructed entirely of lead, in the early 1900s they did use some lead materials in the water system. These were standard practices under prior regulations. (View a diagram)
Over time, Tacoma Water has removed 30,000 lead goosenecks while replacing old service connections. However, there are still hundreds of old service connections from the early 1900s for which we do not have information.
We currently estimate that up to 1,200 service connections may still have lead goosenecks.
To help identify lead goosenecks in our system, we collected multiple water samples from the old service connection pipes at four customers’ homes. We collected the samples after disconnecting the pipes from the homes. As part of this testing, we intentionally created a worst-case scenario to improve our chance of detecting lead from a gooseneck if it was present.
We found elevated levels of lead in the water samples taken directly from the service lines leading to four homes. Some of the test results greatly exceeded the EPA’s accepted limit of lead in drinking water, which is 15 parts per billion for at least 90 percent of homes tested.
The samples and subsequent testing were not required by regulation. Rather, they were designed to create conditions where lead would be present in the water; the goal of that was to help identify and replace old lead parts.