Whittier Narrows Treatment Plant Laboratory

Whittier Narrows Treatment Plant Laboratory is on the official list: California ELAP accreditation. Updated 2026-10-17.

El Monte, California

⚠ Likely serves public water systems only. Call ahead: certification lists include some labs that only test for public water systems.

Certified by: California ELAP accreditation
Official scope: Lab type: County (Municipal). ELAP certificate 1052-S4
Contact: 301 North Rosemead Boulevard, El Monte, CA, 91733
(562) 908-4288
Source: California Water Boards – ELAP drinking water accredited laboratories
Licence: Public record (California State Water Resources Control Board)
Record refreshed: 2026-10-17

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