To insure quality results, Dellavalle utilizes internal quality control checks with replicate samples, matrix spikes, external or control samples and method blanks. Additionally, we employ Good Laboratory Practices (GLP). Our performance is evaluated by Californiaโs Environmental Laboratory Accreditation Program for water and wastewater and the North American Proficiency Testing program for manure, compost, soil, plant tissue and ag water.
Accreditation Program for Water & Wastewater
Proficiency Programs
North American Proficiency Testing Program (NAPT) organized by the Soil Science Society of America
2025 ALP Proficiency Testing Program
Approved Laboratory
CDFA Approved Laboratory Agreement and Permit #10-02
California Regional Water Quality Control Board



















