Official City Notice: Residential lead and copper sampling underway for corrosion control study
By City of Antioch
The City of Antioch Water Treatment Plant wants to reassure community members that city staff are currently conducting official sampling for an ongoing, multi-year Lead and Copper Corrosion Control Study. Following the recent opening of Antioch’s new Brackish Water Desalination Facility, this essential study allows certified city personnel and selected residents to monitor household drinking water and verify that no lead or copper is leaching into home plumbing.
Please note that participation is limited strictly to pre-qualified residential sites meeting specific EPA structural criteria, and we are not accepting general volunteers at this time. If your home was pre-selected, have been contacted by staff, or see water treatment personnel delivering or collecting sample bottles, please be assured that this is an official City of Antioch program and not a scam.
We sincerely thank our designated resident partners for helping keep Antioch’s drinking water safe, clean, and state-compliant.
According to the City’s Lead Service Statement in 2024, “Through completing a historical records review and field investigations, City of Antioch has determined it has no lead or galvanized requiring replacement service lines in its distribution system. This includes any privately-owned or customer-owned service lines.
City of Antioch reviewed all applicable sources of information, including:
• All construction and plumbing codes, permits, and existing records or other documentation which indicates the service line materials;
• All water system records, including distribution system maps and drawings, historical records on each service connection, meter installation records, historical capital improvement or master plans;
• All inspections and records of the distribution system that indicate service line material, including inspections conducted during the course of normal operations (e.g., checking service line materials when reading water meters or performing maintenance activities).
In addition to reviewing the above sources of information, City of Antioch used an alternative method to develop the inventory that was approved by the State Water Resources Control Board Division of Drinking Water on a case-by-case basis.
City of Antioch used stratified random sampling to develop the initial inventory. Stratified random sampling involves physically verifying a subset of randomly selected service lines in the distribution system. That subset is stratified or divided into groups based on certain characteristics (e.g., years the service lines were installed). Stratification allows for a sample or subset of service lines to be more representative of the service lines in the distribution system.
After investigating the subset of service lines, if no lead or galvanized requiring replacement service lines are discovered, the remaining service lines may be assumed non-lead with a certain level of confidence. City of Antioch verified 9322 service lines, and the service lines were verified non-lead copper, non-lead plastic, or galvanized. No lead or galvanized requiring replacement service lines were identified.
City of Antioch continues to document service line material information obtained from normal operations, such as service line maintenance or water meter readings, after October 2024 and will update the initial inventory accordingly.
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For questions or additional information, please contact the City of Antioch Laboratory at (925) 779-7024.
Allen D. Payton contributed to this report.
the attachments to this post:
Antioch Desal Plant inside & outside pipes
Antioch Desal Plant inside pipes & controls
Home water testing & Antioch Desal Plant pipe outside
