Accreditation self-declared
Reference-material producer in Durham, Connecticut that runs proficiency testing studies for environmental laboratories (water supply, water pollution, soil, underground storage tank fuels, DMR-QA) and a cannabis PT programme.
absolutestandards.com
WS Water Supply (SDWA) PT
WS
WP Water Pollution (CWA) PT
WP
Soil (RCRA) PT
Fuels (UST) PT
DMR-QA
AbsoluteGrade Cannabis PT Program
| Scheme | Testing fields | Sample type | Analytes | Rounds/yr | Link |
|---|---|---|---|---|---|
| WS Water Supply (SDWA) PTWS |
| Drinking water | — | — | Scheme page for WS Water Supply (SDWA) PT (opens in a new tab) |
| WP Water Pollution (CWA) PTWP |
| Wastewater | — | — | Scheme page for WP Water Pollution (CWA) PT (opens in a new tab) |
| Soil (RCRA) PT |
| Soil | — | — | Scheme page for Soil (RCRA) PT (opens in a new tab) |
| Fuels (UST) PT |
| — | — | — | Scheme page for Fuels (UST) PT (opens in a new tab) |
| DMR-QA |
| — | — | — | Scheme page for DMR-QA (opens in a new tab) |
| AbsoluteGrade Cannabis PT Program |
| — | Potency, mycotoxins, pesticides and more | — | Scheme page for AbsoluteGrade Cannabis PT Program (opens in a new tab) |
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Compiled from Absolute Standards, Inc. (AbsoluteGrade PT Program)'s own published information or sent in by the provider, and reviewed by EqasOnline. Check scheme details, fees and dates with the provider before you enrol. 6 schemes listed here.
Last updated 1 Nov 2026.
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