Ground Water in Sewage Basin hole


I am installing a sewage ejector pit and pump in basement, hole is dug and I piped the inlet pvc for the toilet and sink. I did not have time to backfill or concrete.

The next morning I woke up to find after a night of rain the basin floating in groundwater. The septic tank is right next to my sump pump.

If I backfill and concrete the sewage basin and pump in, will the excessive ground water be a problem later?

Answers 1

We can presume that the basin is watertight (both out and in). The only real concern, then, is whether the boyancy of the air in the empty tank will overpower the weight of your concrete (or the mechanical connection between the concrete and the basin).

If those aren't a concern, all should be fine. I imagine that the basin has edges and depressions that will anchor it well in the concrete.

February 03, 2016 18:54...

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For decades, millions of gallons of treated sewage has been pumped into the ground. It sounds harmful, but it's actually quite the opposite. This process is crucial in keeping salt water out of aquifers and keeping groundwater replenished.

To date, nearly 490 billion gallons of recycled water have been recharged into the Central and West Coast Basin aquifers. That is one of many water recharge projects occurring all over the world.

Taking water out of the ground at the current rate has led to sinking of land in some parts of the world. By injecting water, the porous layers soak up the water like a sponge.

Sea level rise means there could be a greater force of the ocean to push seawater further underground into groundwater basins, thereby risking freshwater wells becoming salty.

Virtually all coastal aquifers around the world experience seawater intrusion to some degree.

Image via WRD

Ted Johnson, Chief...

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4. Aquifer recharge with wastewater

4.1 Principles
4.2 Operations
4.3 Effects

4.1.1 Soil-aquifer treatment (SAT)
4.1.2 SAT system layouts
4.1.3 Soil requirements

4.1.1 Soil-aquifer treatment (SAT)

Where soil and groundwater conditions are favourable for artificial recharge of groundwater through infiltration basins, a high degree of upgrading can be achieved by allowing partially-treated sewage effluent to infiltrate into the soil and move down to the groundwater. The unsaturated or "vadose" zone then acts as a natural filter and can remove essentially all suspended solids, biodegradable materials, bacteria, viruses, and other microorganisms. Significant reductions in nitrogen, phosphorus, and heavy metals concentrations can also be achieved.

After the sewage, treated in passage through the vadose zone, has reached the groundwater it is usually allowed to flow some distance through the aquifer before it is...

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Leaky Sewage Basin

After building 8 years ago, I am now refinishing our basement. I removed the lid on our sewage basin and discovered that it was full of water. Nothing has been hooked up to it yet and the pump has been disabled. The seal/gasket around the 4” line-in is faulty. The level of water, at equilibrium, is even with the top of the 4” PVC pipe. Hoping that this is a symptom of trapped water under the basement slab, I have been pumping it over to the sump crock. After two weeks, the rate of inflow does not seem to have diminished. Maybe there is a spring under the house?
We have a leach field that is already distressed, having surface water that will run over it during heavy rainfall. We also have a lift tank between septic tank and field.. So, I do not want to pay to pump more than is required (twice)...

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