This data can be seen as an animation as well.
Septic Permit: Each septic system installed since 1966 must have a septic system permit. The permit numbers are assigned sequentially and are recorded in the county courthouse.
Well Number: The Ground-Water Information Center has received copies of all well logs for wells drilled since ????. Each well is assigned a well identification number or M-number. This number allows one to find well data in the GWIC database.
This map shows the date of construction indicated by DOR, Well Log or Septic Permit. The data comes from three sources:
1. The CAMAS data base maintained by the Montana Department of Revenue (DOR) The DOR data base includes information on property address, date built and utilities present. Utilities include well, septic system, public and community water, public and community septic systems, and Gas. DOR sites are identified with a unique Geocode. If the geocode location could be identified based on address or subdivision lot and block the point was digitized from the 1995 Gallatin County Road Book by coordinating section corners with the Gallatin County Public Land Survey System (PLSS) data and associated relevant permit data was attached. If the point cannot be located the point is not digitized. Each Geocode has a date built associated with it.
2. Well location data available from the Montana Ground-Water Information Center. Again, if a well could be located based on address or subdivision, block and lot, the point was entered and data regarding the M-number or GWIC identification number was added as was date drilled. The point was digitized from the 1995 Gallatin County Road Book by coordinating section corners with the Gallatin County Public Land Survey System (PLSS) data and associated relevant permit data was attached. Each well has a date completed attached to the M-number.
3. Septic system location data available from the Gallatin County Department of Environmental Health (GCDEH).
The GCDEH data is in the septic permit file. If the septic permit location could be identified based on address or subdivision lot and block the point was digitized on the 1995 Gallatin County Road Book by coordinating section corners with the Gallatin County Public Land Survey System (PLSS) data and associated relevant permit data was attached. Each permit number has a date issued and a date inspected. Date issued is used for this database.
If more than septic permit or well identification number (M-number) exists for an address, this number is simply recorded as a multiple number for that point and no new point is “spawned”. As a result the duplicate points do not have unique locations. The well-septic database assumes only one location for each address in the road book. Multiples are recorded but not given unique point locations. Information about whether there is a well or septic system present is recorded, but detailed information about well properties or septic properties are not provided. Detailed attribute data regarding wells can be found in the well coverage. Not all points show either a well or a septic system. Each structure indicated on the road book was recorded regardless of whether there is well or septic system information present. In summary, the presence or absence of a well and/or septic system is recorded and duplicates or multiples at a site are ignored.
Summary of the four files welsep, welfnl, sepfnl, geocshp, and their differences. (There are two primary differences between the welsep and the coverages named geocshp, welsep and septicfnl. First, the welsep file contains information drawn from three sources Department of Revenue Geocode database (well and septic data); the Montana Bureau of Mines and Geology Ground Water Information System (wells); the Gallatin County Septic Permit database (septic system). These data are drawn together so that data from multiple sources can be assessed at the same time.) If multiple wells, geocodes, or septic systems are listed at a site, only one point is given, but there are multiple columns for other septic system, well number, or geocode unit number at that point.
Alternatively, there are three separate geocode, well, and septic data bases (geocshp, welfnl, and septicfnl,) these databases have had the locations where multiple geocodes wells or septic systems are indicated at a single site moved arbitrarily located several m from the first point so that each has a unique point location. This information also allows one to explore the data base from different sources and the data from that source without dealing with the information from the other sources. (Although the geocode (parcel ID without the county number and the A97) is reported on all three data bases so that there is a common code.
Definition of attributes from the welsep attribute table is attached.