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Arroyo Grande officials outline April boil-water notice from Zone 3 pipeline; city system never tested positive
Summary
City staff described a brief county-issued boil-water notice tied to routine pipeline sampling from Lopez Lake, saying Arroyo Grande’s own distribution system never tested positive and the county lifted the notice May 3 after follow-up sampling.
City officials told the Arroyo Grande City Council on May 13 that a boil-water notice issued in late April for the Zone 3 water pipeline originated with positive routine samples taken along the county pipeline from Lopez Lake to Port San Luis, not from the city’s internal distribution system.
City Manager Matt Downing said laboratory tests reported two positive total coliform results and one E. coli hit from routine samples taken April 28 and retested April 29. Downing said the county then issued a boil-water notice for the Zone 3 system; Arroyo Grande immediately closed pipeline turnouts and switched to groundwater while conducting daily tests of its system. “We never had a positive test detected in our water system,” Downing said. The city’s water tests remained negative, and the county lifted the boil-water notice on May 3 after follow-up sampling.
Why it matters: a boil-water notice is a public-health action that can disrupt businesses and households; officials emphasized that the city’s distribution system did not show contamination. Downing told the council that the state and county continue investigating the cause and that results may never fully explain the anomaly. He listed possible causes: “a random blip in the system,” faulty test kits, or a leak or low-pressure event that could introduce contamination on the pipeline.
City actions and guidance: After receiving the second county positive, staff “immediately turned off the Lopez Waterline into our city system,” Downing said, describing the pipeline as a “freeway” and local connections as the freeway “turnouts” that the city temporarily closed. The city has asked the county for a joint post-incident meeting to review communications and response steps. Downing urged residents and businesses to sign up for reverse-911 and emergency alerts (readyslo.org) because some people reported not receiving the county notice.
What is unresolved: the county and state Department of Drinking Water continue their investigation; Downing said staff may never determine a definitive cause. The city said it will keep monitoring and push for improvements in notification and coordination with the county.
Ending: City staff said they will bring any new county or state findings to the council and work with the county to refine notification and response procedures for future incidents.
