California Well Standards (Bulletin 74-90 and 74-81)

Provides general information for well standards as well as precautions such as:

Improperly constructed, altered, maintained, or destroyed wells are a potential pathway for introducing poor quality water, pollutants, and contaminants to good-quality ground water. The potential for ground water quality degradation increases as the number of wells and borings in an area increases.

Improperly constructed, altered, maintained, or destroyed wells can facilitate ground water quality degradation

by allowing:

1. Pollutants, contaminants, and water to enter a well bore or casing;

2. Poor quality surface and subsurface water, pollutants, and contaminants to move between the casing and borehole wall;

3. Poor quality ground water, pollutants, and contaminants to move from one stratum or aquifer to another;

4. The well bore to be used for illegal waste disposal.