Pricing on sanitary casing

Pennsylvania is one of only a few states that do not have mandatory statewide construction standards for private water wells. (A few counties and townships have passed well construction ordinances—check with your local government office to determine if they are required in your area.) As a result, some important components of a properly constructed drinking water well are often not installed in an effort to reduce the cost of the well to the homeowner. The most important features missing from most private
wells are a sanitary well cap and a grout seal. These components are required by most states because they help protect groundwater by sealing the well
from potential surface contamination.

Website below can give you some information.

http://pubs.cas.psu.edu/FreePubs/pdfs/XH0011.pdf

http://www.chinasanitarywares.net/