Check valve at pressure tank-- state rules

[Reach4]

Prototype, under development; Corrections and additions and comments solicited.
The question is what are the rules an out-of-well check valve for a private well with submersible pump, with some underground piping, precharged pressure tank.


Each entry is in this multi-line form:
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State
Rule short interpretation
cite
Link(s)
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CT private
*
*
--
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CT public
Vacuum breaker upstream
III.B.21.a
http://www.portal.ct.gov/-/media/De.../dph/drinking_water/pdf/chapter3pdf.pdf?la=en
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IL
prohibited
Section 925.40e2
http://www.dph.illinois.gov/sites/d...installation-code-and-act-04102014-042716.pdf
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IN
"not needed"
--
https://www.in.gov/isdh/23258.htm
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MN
vacuum breaker if CV
4725.515
https://www.revisor.mn.gov/rules/?id=4725.5250
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NE
not addressed
--
http://govdocs.nebraska.gov/epubs/H8310/R178.0012-2005.pdf
http://www.sos.ne.gov/rules-and-reg...uman_Services_System/Title-178/Chapter-12.pdf
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TX
no negative pressure...irrigation?
--
https://www.tdlr.texas.gov/wwd/wwdrules.htm
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