Los Angeles, California — Health officials have issued an urgent boil water advisory for part of Los Angeles’ Koreatown after routine testing detected E. coli bacteria in the neighborhood’s water system, prompting emergency notifications, bottled water distribution, and continued testing.
The advisory affects a small section of the neighborhood as authorities work to determine the source of the contamination and ensure the public water supply is safe.
Officials are urging residents to avoid drinking or cooking with unboiled tap water until further notice.
Boil Water Notice Issued After Positive Test
According to the Los Angeles Department of Water and Power (LADWP) and the State Water Resources Control Board’s Division of Drinking Water, preliminary testing conducted on June 30 detected Escherichia coli (E. coli) at one sampling location.
As a precaution, officials immediately issued a boil water notice for the affected area.
Residents have been instructed to use only boiled tap water or bottled water for drinking, cooking, brushing teeth, preparing food, and making ice until additional testing confirms the water is safe.
In their public notice, officials stated:
“ONLY USE BOILED TAP WATER OR BOTTLED WATER FOR DRINKING AND COOKING PURPOSES until further notice due to the positive Escherichia coli (E. coli) bacteria results received on June 30, 2026.”
Which Areas Are Affected?
The advisory covers approximately two square blocks in Koreatown.
According to officials, the impacted area is bordered by:
- West 5th Street (south side)
- Mariposa Avenue (west side)
- 6th Street (north side)
- Ardmore Avenue (east side)
Emergency crews have gone door-to-door notifying residents and business owners while distributing information about the advisory.
Officials have also emphasized that the contamination appears to be isolated and is not connected to the recent Boyle Heights fire.
Bottled Water Distribution Underway
To help affected residents, city officials have deployed trucks loaded with bottled water throughout the neighborhood.
Free bottled water and ice are being distributed while testing continues.
The office of Councilmember Heather Hutt, whose district includes Koreatown, said city staff members are working alongside LADWP to keep residents informed.
“LADWP has stated this is an isolated exposure, narrowed down to a singular testing location amongst many in the area,” Hutt’s office said.
Officials also confirmed that staff members have been walking through the neighborhood to notify residents and local businesses about the boil water advisory.
At this time, authorities have not announced when the advisory will be lifted.
What Is E. coli?
According to the Centers for Disease Control and Prevention (CDC), most strains of E. coli naturally live in the intestines of healthy people and are generally harmless.
However, certain strains can cause serious illness.
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Symptoms may include:
- Bloody or watery diarrhea
- Stomach cramps
- Vomiting
- Fever
Health officials advise anyone experiencing severe symptoms after possible exposure to seek medical attention.
Officials Continue Investigating
Water quality experts continue collecting additional samples as they work to determine the source of the contamination.
Officials say the advisory will remain in effect until follow-up testing confirms the water system is safe for normal use.
Residents are encouraged to continue following official guidance, use bottled or properly boiled water, and monitor updates from local authorities until the notice is lifted.
Have you ever experienced a boil water advisory in your community?
What steps do you think cities should take to quickly notify residents during public health emergencies? Share your thoughts respectfully in the comments below.