Just had a neighbor put a new one in. Don’t know if it was an envirofin. The tank alone cost about 8k. Estimate (I think) was about $25 - 30k including barge services but, they had to track sand for the field about 300 ft back up a steep grade using a bobcat. Also had a medium size cat excavator doing the digging.
Once you have an approved design a contractor can provide a cost estimate.
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