NPS
MANDATORY for Data Store: NPS Alpha Unit Code (ACAD)
MANDATORY for Data Store: NPS Unit Type (National Park, National Monument, etc)
20140417
13250100
FALSE
20250523
17251100
20250523
17251100
Wellhead_ProtectionIWPA
37569.640000
329046.059700
777922.153400
952018.266300
1
002
0.000
Projected
GCS_North_American_1983
NAD_1983_StatePlane_Massachusetts_Mainland_FIPS_2001
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FGDC
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MassDEP
GIS Director
617-292-5500
100 Cambridge Street - Suite 900
Boston
MA
02114
US
20250514
ArcGIS Metadata
1.0
MassGIS
1 Ashburton Place - Room 819
Boston
MA
02108
massgismail@mass.gov
Download from https://www.mass.gov/info-details/massgis-data-massdep-wellhead-protection-areas-zone-ii-zone-i-iwpa
File Geodatabase Feature Class
0.000
Interim Wellhead Protection Areas
2025-05-14
MassDEP, GIS Director
vector digital data
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>In the absence of an Approved Wellhead Protection Area (Zone II), the MA DEP has adopted the Interim Wellhead Protection Area (IWPA) as the primary, protected recharge area for public water supply (PWS) groundwater sources in Massachusetts. For PWS sources that pump less than 100,000 gallons per day (GPD), the IWPA radius is proportional to the pumping rate in gallons per minute (GPM). Pumping rate is based on of several methods including, DWP approved pumping rate, metered data, Title 5 flow rate. The formula used for calculating the PWS well point buffer radius in feet is: Radius = ( 32 x pumping rate in GPM ) + 400 The minimum IWPA radius is 400 feet, the maximum (default) radius reached at 100,000 GPD (70 GPM) is 2,640 feet (1/2 mile). In instances where pumping rate information is unavailable default radius values are assigned based on the PWS well classification. The default radius for community class PWS groundwater sources (GW) is 2,640 feet (804.6 meters). The default radius for non-community sources is 750 feet (228.6 meters) for Non Transient (NTNC) wells and 500 feet (152.4 meters) for Transient (TNC) wells. The IWPA layer contains variable width IWPAs for BOTH community and non community groundwater sources in the DEP PWS datalayer which do not have an approved Zone II. IWPA features are generated by buffering PWS well point locations in the DEP Public Water Supply datalayer (PWSDEP_PT) based on radius values determined from the best available pumping rate information. The IWPA features are relatable to the PWS source points by SOURCE_ID.</SPAN></P></DIV></DIV></DIV>
Interim Wellhead Protection Areas (IWPA)
MassDEP
MassDEP
GIS Director
617-292-5500
100 Cambridge Street -Suite 900
Boston
MA
02114
US
Public Water Supply (PWS) Interim Wellhead Protection Areas (IWPA)
Public Water Supply (PWS) Interim Wellhead Protection Areas (IWPA)
See access and use constraints information.
Esri ArcGIS
true
-73.485778
-69.922254
42.818778
41.234779
1
-73.485778
-69.922254
42.818778
41.234779
0
DEP.IWPA_POLY
Feature Class
0
OBJECTID
OBJECTID
OID
4
0
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
SOURCE_ID
SOURCE_ID
String
14
0
0
TYPE
TYPE
String
6
0
0
SITE_NAME
SITE_NAME
String
40
0
0
SUPPLIER
SUPPLIER
String
40
0
0
TOWN
TOWN
String
21
0
0
IWPA_FT
IWPA_FT
Double
8
0
0
PWS_ID
PWS_ID
String
7
0
0
SHAPE
Feature geometry.
Esri
Coordinates defining the features.
Shape
Geometry
0
0
0
Shape_Length
Shape_Length
Double
8
0
0
Length of feature in internal units.
Esri
Positive real numbers that are automatically generated.
SHAPE_AREA
Shape_Area
Double
8
0
0
Area of feature in internal units squared.
Esri
Positive real numbers that are automatically generated.
dataset
EPSG
2.1(3.0.1)
Simple
FALSE
0
TRUE
FALSE