An open, abandoned well constitutes a physical hazard and forms a vertical pathway for movement of bacteriological and chemical contaminates into the groundwater supply. Any toxic or adulterating substances entering the well may, in time, migrate to aquifers furnishing water to nearby wells.
In addition, a deteriorated and corroded well casing can cause degradation of the groundwater by intermixing aquifers.
The minimum standards for destruction of abandoned wells are shown in the drawing attached with the Encroachment Permit (PDF). The City of Patterson may change the requirements when adverse or special conditions warrant.
Septic Tank Destruction
Section 1119 of the Uniform Plumbing Code requires that when connecting to community sewer, or replacing an existing septic, the old septic tank is to be destroyed.