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Re:Health Concerns Mount as More Old Sewer Pipes Are Lined w... by Scoundreller on Tuesday November 26, 2019 @06:37PM (#21643862)
Why was there CO in your sewer?
Re:Health Concerns Mount as More Old Sewer Pipes Are Lined w... by serf on Tuesday November 26, 2019 @08:45PM (#21644591)
carbon monoxide can be found in trace amounts within septic tank gas accumulations.

http://medcraveonline.com/JACCOA/JACCOA-06-00228.php