Trusted by thousands of commercial, research and government laboratories in over 80 countries, ERA delivers more than data validation and documentation. We deliver the peace of mind that comes from partnering with the world's premier provider of certified reference materials (CRM) and proficiency testing (PT) products.


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DMR-QA Customers

DMR-QA Study Open and Close dates determined by EPA. Displayed DMR-QA dates are placeholders.

DMR-QA 45 Study Dates

2025 Compliant Studies	Open	Close
DMR-QA 45	Est April 2025	Est July 2025
WP-360	Jan 21	Mar 7
WP-361	Feb 17	Apr 3
WP-362	Mar 10	Apr 24
WP-363	Apr 14	May 29
WP-364	May 12	Jun 26

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Attention MilliporeSigma Customers:

Effective January 1, 2024 Proficiency Testing Services will no longer be offered from MilliporeSigma. Study renewals for 2024 through the Supelco® PT portal will no longer be offered in October.

Waters ERA is here to assist with your Proficiency Testing needs. If you would like to talk with a representative please use Live Chat, call 1-800-372-0122, or Contact Us.

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Be certain with accurate and defensible data from ERA. We are an ISO 17043 and NELAC-accredited PT provider and one of the world's most trusted suppliers of PT and CRM products. Trend performance and mitigate risk with our innovative eDATA informatics tool.

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Overcome your analytical challenges with ERA. Our expertise covers a broad range of analytes, concentrations and matrices. Count on us for meticulous quality documentation and responsive service.

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Test for total organic carbon (TOC) or turbidity in ultra-pure or drinking water, and ensure you meet water quality standards with ERA. We offer certified reference materials, containers and consumables for ultra-pure water analysis.

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Navigate regulatory requirements with expert guidance from the industry leader in the EPA's DMR-QA. ERA can also help you with pre-testing training and support corrective actions.

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When it comes to protecting the environment and human health, a proven testing partner is key. Our broad industry experience, extensive accreditations and deep knowledge of international regulations give you the resources to tackle regulatory challenges and gain a competitive advantage. Discover what it means to have ERA as "Your Partner in Quality".