I believe state approved septic designs are good for at least 4 years. Call the person who did the design and they can tell you. Also check with the town where the design was approved for and talk to the health officer or a clerk there who should know the answer. Also the DES is very helpfull. They have copies of approved plans on file.
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Just Sold
At the lake the stress of daily life just melts away. Pro Re Nata
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