# Hydroxyethylidine Diphosphonic Acid; Exemption From the Requirement of a Tolerance
> **Rule** · Final rule. · Published 1998-05-22 · Effective 1998-05-22 · 63 FR 28253
## Document
- **Document number:** 98-13603
- **Category:** pesticide
- **Federal Register citation:** 63 FR 28253
- **CFR reference:** 40 CFR 180
- **Publication date:** 1998-05-22
- **Effective date:** 1998-05-22
- **EPA docket:** OPP-300658
## Abstract

This regulation establishes an exemption from the requirement of a tolerance for residues of hydroxyethylidine diphosphonic acid (HEDP), when used as an inert ingredient (stabilizer/ chelator) in antimicrobial pesticide formulations applied in or on raw agricultural commodities. Ecolab, Inc. requested this tolerance under the Federal Food, Drug and Cosmetic Act (FFDCA), as amended by the Food Quality Protection Act of 1996 (Pub. L. 104-170).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1998/05/22/98-13603/hydroxyethylidine-diphosphonic-acid-exemption-from-the-requirement-of-a-tolerance)
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