Septic tank Do’s & Don’ts


  • Read and follow all portions of the SII installation instructions for your tank and the Site Selection/Preparation document available at
  • Call 402-467-5221 if you any questions about the tanks, installation instructions, or the Site Selection/Preparation document.
  • Use the tanks for underground and septic applications only.
  • Ensure the installer complies with all state, county, and local codes and regulations regarding the tanks and installation.
  • Document the tank serial number (10-digit number located under the inlet) and model number for all warranty inquiries.
  • Use corner lifting lugs when handling the tanks.
  • Exercise caution and safe practices in handling and installing the tank.
  • Exercise caution with any object which may damage or puncture tanks including forklifts and excavating equipment.
  • Locate the septic tank in an area that not be subjected to excessive pressures from elevated ground water during rain events.
  • Call 402-467-5221 if saturated soil or seasonable water tables are indicated for special instructions.
  • Install the tank parallel to any slope as discussed in the Site Selection/Preperation document.
  • Locate the tank in an area where it will not experience vehicular traffic.
  • Ensure the tank is level and bedded in 50/50 mixture of sand and gravel per SII installation instructions.
  • Ensure the connections between tanks, risers, and lids are water tight and installed per SII installation instructions.
  • Ensure the connections in and out tank are water tight—inlet and outlet connections must be made via watertight connection.
  • Maintain the max & min burial depths—36” max: NexGen D2 and Sphere tanks—24” max.
  • Ensure all backfill material is free of all debris including wood, concrete, rocks/boulders, masonry debris, etc.
  • Ensure all backfill material is free of clay and will not create voids greater than 1/4”.
  • Backfill around the tank evenly and uniformly in lightly compacted 12” layers.
  • Ensure proper venting is maintained to the house vent for each septic and/or pump tank.
  • Ensure all “pre-cover” inspections, if necessary, are completed prior to completing the backfilling to finish grade.
  • Mound the excavation a min. of 5” above finish grade to allow for drainage away from the tank per SII installation instructions.
  • Ensure all water runoff from sloping terrain, adjacent structures, paved surfaces, etc. is diverted away form the tank installation.
  • Note the location of the inlet and outlet manholes for inspection and maintenance purposes.
  • Inspect your system (every 2-3 years) and pump your tank as necessary (generally every 3 to 5 years).


  • Use septic/pump tanks for any other application other than it intended use—cisterns are available for underground water applications and above ground tanks for above ground applications.
  • Use the tank as a grease trap or subject the tank to water temperature higher than 120° F.
  • Subject the tanks to drops from higher than 48”.
  • Subject the tanks to impact in cold weather.
  • Locate tanks at the bottom of sloping terrain unless adequate measures are taken to prevent water runoff from infiltrating the tank excavation.
  • Locate tanks at the lowest point of the grade—in this situation mounding alone may not provide enough drainage away from the tank excavation.
  • Locate a septic or pump tank beneath driveways or in the pathway of heavy or vehicular traffic areas.
  • Over-excavate or “belly-out” the excavation.
  • Install the tanks with backfill containing clay, wood, concrete, rock/boulders, masonry debris, etc.
  • Leave a tank excavation open without adequately protecting the tank excavation from rain water infiltration.
  • Backfill only to the finish grade level—eventually the settled ground will cause rainwater to pool.
  • Allow water runoff to be directed towards or near any part of the septic system.
  • Allow vehicular traffic over the location of the septic system.
  • Plant trees, shrubs or a garden near the septic system—roots may clog or damage the system.
  • Enter your tank—septic gases can deplete the amount of oxygen, which can lead to asphyxiation.


Before installing Snyder Septic Tanks, you must read Snyder Site Selection/Preparation document and follow the guidelines provided; and, Installation Procedures provided for each type of tank. Failure to follow these instructions WILL VOID YOUR WARRANTY. Both documents can be found on the Snyder web site: