NTRTMT	No pollution abatement has been performed
PTRTMT	Some, but not all, of the intended pollution abatement has been performed
TREATD	All of the intended pollution abatement has been performed
CMBTRT	Combined treatment, where treatment status does not clearly fall into one of the categories defined above.  Include unknown treatment status
SEWER	Monitoring within a sewer (see level 5 for further identification)
INPLNT	Inside a treatment facility.  This type is used in conjunction with plant location codes defined within the STORET User Handbook
