Septic Design & Permitting in Western Montana

All Western Counties have a Septic Design & Permitting criteria to follow when making application for a new or replacement septic system. These Regulations will have setback distances from things like boundary lines, buildings or wells, we assist by designing systems that can fulfill all setback requirements. The regulations will require system sizing based on a soils study as well as an ‘application rate’ or the amount of treated effluent planned to be placed in the earth mantle. We facilitate the designing system that can fulfill all setback requirement and soil conditions. This includes, soils identification to determine the ability of absorbing fluids, any limiting structure (bed rock, or other impervious materials, evidence of ground water is considered).

The proximity to bodies of water are rigorously reviewed to insure the syste4m will not degrade the waterways. If the source of affluent is a “new or increased” as in an addition of bedroom, or maybe the addition of a guest house on the property non delegation of adjacent surface waters is considered, this is a review of the effects of the new system normally the concerns are nitrate migration and acclamation. Phosphate breakouts to surface waters, in some congested instances even viral migration is considered in the design and implementation of septic systems.

Septic Design & Permitting Septic Design & Permitting Septic Design & Permitting Septic Design & Permitting

Septic Design & Permitting

For new or increased sources of effluent (additional bedroom guest home, etc.) additional work is required to review the effects of nitrate and phosphate concentrations that will be placed in the earth mantle. Many times this needs to be considered not only as a per site value, but overall or cumulatively with other existing systems, or MDEQ approved well and drain field sites. Or natural water bodies, ie: lake, river stream etc.

The results of this activity will determine the 2 active parts of any successful septic system, the first part is the digester, commonly referred to as a septic tank. The purpose of this is to intake raw sewage from the source, allowing a microbactorial action to break the wastes down into smaller, simpler particle, after treatment, we generally refer to the materials as affluent, no longer raw sewage. The affluent is then transported to an absorption field where the affluent is absorbed into the earth mantle. In many installations today the local Regulations will require a ‘pressure dose’. The septic tank will be equipped with a pumping chamber. This is a separate chamber from the digestion chamber. After a pre-set amount of affluent has been accumulated in the pump chamber , a pump will start pumping the affluent into a smaller diameter pressure lines attached to a distribution manifold. The pressure lines are equipped with small a nozzle which sprays into an underground absorption chamber.

Other systems may employ a sand mound to distribute the affluent (you see this in areas of higher groundwater). In some cases you will see shallow gravel lined trenches with pipe distribution system.

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