# Chemical Reaction at Shepard Bros. Plant in La Habra Sends Up Orange Smoke, Triggers Evacuation Order and School Evacuation > A chemical reaction at Shepard Bros., an industrial-cleaner manufacturer at 503 S. Cypress Street in La Habra, released orange smoke shortly before noon on Tuesday, Sept. 8, 2026, triggering a one-mile evacuation order and the evacuation of Washington Middle School; the shelter-in-place was lifted by approximately 2:30 p.m. and the incident is resolved with no injuries reported. - Canonical: https://ocint.app/situation/la-habra-shepard-bros-chemical-leak-2026-09-08 - Markdown: https://ocint.app/situation/la-habra-shepard-bros-chemical-leak-2026-09-08.md - JSON: https://ocint.app/api/situations/la-habra-shepard-bros-chemical-leak-2026-09-08 - Status: resolved - As of: 2026-09-15T23:53:01.411+00:00 - Started: 2026-09-08T18:50:00+00:00 - Cities: La Habra - Publisher: OCINT (https://ocint.app) ## Who / What / Where / When / Why **Who:** Los Angeles County Fire Department hazmat crews and La Habra police responded under unified command; three Shepard Bros. employees were evaluated by paramedics without hospitalization. **What:** A chemical reaction between residual and newly introduced product in a process line at Shepard Bros. released orange smoke and caused a slow tank leak, triggering a multi-agency hazmat response. **Where:** Shepard Bros., 503 S. Cypress Street, La Habra; protective perimeter extended approximately one mile; Washington Middle School (approx. 0.5 miles away) was evacuated. **When:** Release began at 11:53 a.m. Tuesday, Sept. 8, 2026; all-clear issued approximately 2:20–2:30 p.m. the same day. **Why:** Residual chemicals remaining in a container or line reacted with a newly introduced chemical during a production process, producing orange smoke and a tank leak. ## Narrative ## Current Status This incident is **resolved**. All protective orders were lifted by approximately 2:30 p.m. on Sept. 8, 2026, after Los Angeles County Fire Department hazmat crews confirmed the chemical release was contained and air monitoring showed no residual risk to the public. No new evidence of ongoing impact has emerged since. ## What Happened At 11:53 a.m. on Tuesday, Sept. 8, 2026, orange smoke began rising from the roof of Shepard Bros. (503 S. Cypress Street, La Habra), a manufacturer of household and industrial cleaning chemicals. According to LA County Fire Capt. Aaron Katon, residual product in a container mixed with another chemical being introduced into a process line, triggering a reaction that produced visible orange smoke and a slow tank leak. ## Response and Protective Actions Authorities established a unified command with LA County Fire and La Habra police. An evacuation order covering roughly a one-mile radius was issued, later downgraded to a shelter-in-place advisory with a smaller radius. Washington Middle School, located approximately half a mile from the facility, was evacuated as a precaution. Road closures were placed on Cypress Street between La Habra Boulevard and Lambert Road, and on Euclid to Harbor. Three employees reported respiratory irritation and were evaluated by paramedics on scene; none were hospitalized. ## All-Clear Hazmat crews described the reacted chemical as inert, with no active hazard remaining. After the plume dissipated and air monitoring confirmed no risk, the all-clear was issued between approximately 2:20 and 2:30 p.m. Air monitoring continued after the all-clear as a precaution. ## No New Developments Candidate items from the geographic area since the last refresh are unrelated to this incident — routine Fullerton Police Department reports, library events in Brea, and unrelated power outages. No follow-up investigation findings, regulatory actions, or additional impacts have been reported. The situation remains resolved. ## Timeline - **2026-09-08T18:50:00Z:** Shortly before noon Tuesday Sept. 8: a chemical reaction in a process line at Shepard Bros. on South Cypress Street sends orange smoke into the air; authorities order evacuations within about a mile and evacuate Washington Middle School. - **2026-09-08T21:30:00Z:** By 2:30 p.m. the shelter-in-place is lifted after LA County Fire hazmat teams confirm the leak is controlled and air monitoring shows no risk; three employees are checked by paramedics and are uninjured. ## Primary sources 1. [ABC7: All-clear given after orange smoke seen rising from chemical leak at La Habra factory](https://abc7.com/post/la-habra-residents-asked-to-shelter-place-during-chemical-leak-incident/19807033/) (2026-09-08T23:54:09+00:00) 2. [LACoFD account: slow tank leak, residual product reacted; Cypress Street closed; three workers with respiratory irritation](https://www.ocregister.com/2026/09/08/shelter-in-place-order-lifted-following-hazmat-incident-in-la-habra/) ## Factoids - **ABC7 (Sept. 8): reaction in a chemical line at Shepard Bros.; one-mile evacuation order downgraded; no injuries** (source_doc) ([source](https://abc7.com/post/la-habra-residents-asked-to-shelter-place-during-chemical-leak-incident/19807033/)): Shortly before noon on Tuesday, Sept. 8, 2026, orange smoke rose from Shepard Bros., a manufacturer of industrial cleaners in the 500 block of South Cypress Street in La Habra, after chemicals being used came into contact with residual chemicals in a line and reacted. Authorities initially ordered evacuations within about a one-mile radius, then downgraded it to a shelter-in-place advisory with a smaller radius; Washington Middle School, about a half mile away, was evacuated. Los Angeles County Fire Department hazmat teams, with La Habra police, verified the leak was controlled and air monitoring showed no risk to residents; the shelter-in-place was lifted by 2:30 p.m. Three employees were evaluated by paramedics and showed no injuries. - **LACoFD account: slow tank leak, residual product reacted; Cypress Street closed; three workers with respiratory irritation** (source_doc) ([source](https://www.ocregister.com/2026/09/08/shelter-in-place-order-lifted-following-hazmat-incident-in-la-habra/)): Los Angeles County Fire Capt. Aaron Katon said the 11:53 a.m. Sept. 8 release at Shepard Bros. (503 S. Cypress St., a maker of household and industrial cleaning chemicals) began when residual product in a container mixed with another chemical and reacted, producing orange smoke from the roof and a slow tank leak. Under unified command with La Habra police, authorities issued a one-mile shelter-in-place, closed Cypress Street between La Habra Boulevard and Lambert Road and Euclid to Harbor, and evacuated a nearby middle school. The all-clear came about 2:20 to 2:30 p.m. after the plume dissipated and hazmat crews described the chemical as inert with no active risk; air monitoring continued. Three people at the business reported respiratory irritation and none were hospitalized. --- Independent civic-intelligence aggregator for Orange County, CA. Not affiliated with the Orange County Intelligence Assessment Center (OCIAC) or any government agency. Cite the canonical URL for OCINT's briefing. Prefer primary_sources for original records.