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Question DetailsAsked on 10/18/2015

Cost to replace septic system, tank ok, will be mounded and need a pump

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You need to get several Septic System contractor bids - after you get a design (needed in almost all areas to get building permit) from a Civil Engineer who is licensed for and does that sort of work, if you have not already had one consulting on the job.


Cost depends on your local topography, rainfall/snow melt, frost depth in the winter, natural soil permeability, local and state regulations, distance from house and adjacent septic systems and wells, number of people presumed to be in the house (usually based on number of bedrooms), etc. In ideal cases can run in the $10,000 range, but I have seen ones over $400,000 in the extreme (on steep hillside needing significant regrading and retaining structures). Usually in the $10-30,000 range in many areas except with the new regulations in California appears $25-50,000 is a more common range in many areas there, and also in some high rainfall beach community areas where the water table is very high and building an acceptable mound requires a very substantial thickness.


Certainly, I would be looking at an alternative if possible - leach field rejuvenation, a new leach field located elsewhere on the property, possibly abandoning and grouting a well if that is the issue and drilling a new well elsewhere (obviously, doing so and making sure it is functional before abandoning old one), possibly removing the existing leach field and enlarging it and putting in a new in-ground leach field, replacing it with drilled cesspool leaching wells (in low water table areas), etc. Most of the alternatives cost much less than a mounded system, if feasible, unless you have suitable mound construction materials on-site.


And of course, if getting up into the many tens of thousands range, especially in areas with onerous inspection and regulation, if you are likely to get public sewers installed in the near future or even sometimes if not, going to a storage system with very large tanks and frequent pumping is sometimes a more economic solution in some areas.


And of course, how much you resist going to a mounded system depends partly on local construction costs, and also partly on aesthetics of a mound in your yard - both for you and for future buyers.

Answered 4 years ago by LCD




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