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The following list of on-site wastewater treatment units has been tested under NSF Standard 40 by NSF International and is approved for residential use in Texas in accordance with 30 Texas Administrative Code § 285.32(c)(4). NSF International can contacted at 1-800-NSF-MARK. Clearstream Wastewater Systems, Inc. Consolidated Treatment Systems, Inc. Delta Environmental Products, Inc. The following list of on-site wastewater treatment units has been tested under NSF Standard 40 by C-K Associates, Inc. and is approved for residential use in Texas in accordance with 30 Texas Administrative Code §285.32(c)(4). C-K Associates, Inc. can be contacted at 225-755-1000.
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