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Sanitary sewer exemption

The contamination of water resources is one of the most serious problems in environmental matters that Costa Rica is currently facing, for this reason, Costa Rican legislation has a series of regulations and legislations that must fulfill any activity, work or project.

To avoid contamination of surface and groundwater is expected that all developments have a wastewater treatment system as are the wastewater treatment plants, however, these are expensive and according to the geological environment where they are located they can be excessive because the transit of pollutants is enough for pollutants to completely degrade before affecting aquifers or other bodies of water with cheaper measures, as is the use of septic tanks with drains.

There is a procedure that must be endorsed by the National Institute of Aqueducts and Sewers (AyA) to exempt the construction of a sanitary sewer system and to treat the waters through the use of septic tanks and individual drains, nevertheless, this procedure must be accompanied by a series of studies to examine the contamination vulnerability of the aquifers in the area to be developed.

In Geo Costa Rica we carry out this type of studies that consist of the study of transit of pollutants where the risk and threat of present and future contamination for aquifers is detailed where the risk and threat of present and future contamination for aquifers due to infiltration of sewage is detailed. If, as a conclusion of the analysis of the data, it is determined that the transit time of contaminants allows concluding that the project complies with the regulations it can give way to the exoneration of the obligation to build sanitary sewer for the project.


This will depend on the permeability of the soil calculated through infiltration tests made in the field, soil porosity tests and the analysis of the hydrogeological study of the land from the elaboration of hydrogeological profiles and geological and hydrogeological cartography from data interpolation and interpretation of information such as that of nearby wells to determine the behavior and composition of the subsoil and groundwater in the project area.

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Geo Costa Rica - Environmental Consultants

Processing, monitoring and environmental assessment in hydrogeological studies, natural hazards, well drilling, water concession and Environmental Impact Studies.

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DesamparadosSan José, Costa Rica
Phone: 2259-7340 Cell phone: 8721-6931 E-mail: apadilla@geocostarica.com
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