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Scientist collecting water samples from a river for Clean Water Act 401 compliance testing in an ANAB-accredited laboratory.
ANAB | Laboratory

Clean Water Act 401 Certification

ByPhillip Mariscal, Manager of Accreditation, Validation and Verification February 17, 2026February 9, 2026

Section 401 of the Clean Water Act (CWA) empowers states and tribes to protect water quality by certifying that federally permitted discharges will meet applicable…

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