UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
                    GUIDANCE FROM HOTLINE COMPENDIUM
                                                                           WSGH2


SUBJECT:    Interstate Carriers

SOURCE:    Ray Enyeart

What is the difference between an interstate carrier and a non-community water system? Can an
interstate carrier be classified as a non-community water system?  If so, can such an interstate
carrier be classified as a non-transient non-community water system (NTNCWS)?

       Response:

       Those interstate carriers that meet the definition of a public water system, as specified in
       40 CFR Section 141.2(e), are considered to comprise a subcategory of non-community
       water systems. An interstate carrier could therefore be a NTNCWS if it meets the
       NTNCWS definition; i.e., if it is large enough to employ 25 or more people for six or
       more months per year.
      Note: This guidance may be updated in the future. Contact Steve Clark at EPA
      Headquarters for further information.

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