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Public Works says last week's Lopez water 'boil notice' was unprecedented; county to pursue root-cause review and outreach

3299790 · May 6, 2025
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Summary

Public Works Director John Diodati updated the Board on an unprecedented boil notice affecting Lopez Water last week, saying the county will investigate the cause, coordinate with state agencies and conduct public outreach about testing protocols and alert systems.

County Public Works Director John Diodati told the Board of Supervisors that last week’s boil-water notice for the Lopez water system was “incredibly rare and unusual,” and that staff will continue to work with state drinking-water authorities to find the cause and prevent repeats.

Diodati said Lopez Water has been treated by the county for more than 50 years and that this is the first time the county has exceeded sampling thresholds that warranted a boil-water order. He said the county will conduct an after-action review, continue sampling and testing, and provide information to the public about the testing protocols and how to sign up for county alert systems.

Diodati thanked county and partner staff — including city utilities, community services districts and the Division of Drinking Water — for coordinating a unified public-health response, and said the county will publish more detailed findings as the investigation proceeds.

Supervisors asked that staff produce an outreach plan explaining how residents can receive emergency notices in future events. The board did not take regulatory or funding actions at this hearing; staff said it will return with further information if the investigation reveals operational causes that require capital or procedural changes.