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Plumbing board declines immediate approval for Hydratec’s detoxified ethylene glycol for geothermal wells
Summary
After testimony from Hydratec, the Connecticut Plumbing Board voted unanimously to deny approval of a detoxified ethylene glycol working fluid (DTX) pending reviews and additional toxicology and agency sign-offs from the Department of Public Health and Department of Environmental Protection.
The Connecticut Plumbing Board voted unanimously to deny approval at this meeting for Hydratec’s “detoxified ethylene glycol” working fluid for geothermal well applications, citing unanswered questions from state health and environmental officials and requests for more toxicology and remediation data.
Mark Stone, representing Hydratec, told the board the fluid — called DTX — “has an NSF approval for incidental food contact,” has been tested for the EPA and reviewed by the FDA, and is already used in the U.K. and in some U.S. projects. Stone said installers, including Dandelion Energy, had asked for permission to use the product because, he said, “it has better thermal efficiency than standard propylene glycol, and it's less costly.”
Board members said the…
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