For a “right sized” (based on occupancy) tank with year round use, normal pumpout cycle is 3 yrs. My tank was right sized for two adults/two children. We now have 5 adults. My septic company suggested pumpouts every year based on increased usage. Don’t know if this was salesmanship or not but, I took the advice because I don’t want “emergencies.”
My first pumpout for the Island was 15 years (used mostly weekends during the summer) and never had any problems. (I pump about 125 feet uphill to the leach field). When we pumped with ISS we combined with a neighbor and saved 1/2 the transit cost. They did a great job.
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