How often do I need to disinfect (chlorinate) my well?

Wells are chlorinated to rid them of bacteria contamination. Wells that are properly protected with casings and seals and that are properly constructed only need chlorination when the well and pump is first installed and whenever any repair or maintenance is done. If bacteria continue to return, the well either needs to be repaired, or a continuous disinfection system should be installed.

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1. Do I need to get a permit to drill a well or repair my existing well?
2. What inspections from the Health Department are required for my well?
3. What do I need to do to maintain my well?
4. When does a well need to be abandoned and why?
5. How can I test the quality of my private drinking water supply?
6. What is a bacteria test and what does it tell me?
7. What do I do if bacteria are found in my well?
8. What happens if the bacteria return after chlorination?
9. How often do I need to disinfect (chlorinate) my well?
10. How often should I have my well tested?
11. My well has a terrible rotten egg (sulfur) smell. What do I do?
12. I am having problems with the quality of my water (cloudy, red, black, or brown colored, green staining, etc). Where can I find help?
13. Do I need to get my water tested for pesticides or petroleum products (VOC)?