Name: auids_pnts_2026

Display Field: WB_NAME

Type: Feature Layer

Geometry Type: esriGeometryMultipoint

Description: Assessment Units (AU) are the basic unit of record for conducting and reporting water quality assessments to EPA. All assessment units are based on 1:24,000 scale hydrography linked to the National Hydrography Dataset (NHD); the national coverage used by EPA. Surface waters for which data was available to make an assessment, but which were not shown on the base NHD coverage, were added to this coverage on a case-by-case basis and linked to the NHD. Based on the NHD coverage and to facilitate reporting, surface waters were separated into the five waterbody types: rivers and streams; impoundments; lakes and ponds; estuaries; and ocean.AUs are intended to be representative of homogenous segments; consequently, sampling stations within an AU can be assumed to be representative of the segment. In general, the size of AUs should not be so small that they result in an unmanageable number of AUs for reporting. On the other hand, AUs should not be so large that they result in grossly inaccurate assessments.Many factors can influence the homogeneity of a segment. Factors used to establish homogenous AUs include: waterbody type; HUC-12 boundaries; water quality standards; pollutant sources; major changes in land use; stream order; public water supplies; outstanding resource waters; shellfish program categories; designated beaches; and cold water fish spawning areas. Each AU must have a unique identification number (i.e. AUID) to facilitate tracking and reporting of assessment results for each AU. AUIDs are unique to each waterbody and are formatted as SSWWWHHHHHHHHH-UU, where: SS = Stateabbreviation WWW = 3 letters to readily identify the waterbody type RIV = Rivers and StreamsLAK = Lakes and PondsIMP = ImpoundmentsEST = EstuaryOCN = Ocean HHHHHHHHH = Last 9 digits of the 12 digit HUC UU = AU segment number Example AUID: NHRIV801060405-01

Copyright Text: The New Hampshire Department of Environmental Services, Watershed Management Bureau, Water Quality Planning Section, should be acknowledged as the data source in products derived from these data.

Min. Scale: 249999

Max. Scale: 0

Default Visibility: true

Max Record Count: 2000

Supported query Formats: JSON, geoJSON, PBF

Use Standardized Queries: True

Extent:

XMin: -8067983.51833776
YMin: 5265874.32314277
XMax: -7856618.18392507
YMax: 5633984.88245647
Spatial Reference: 102100 (3857)

Drawing Info:

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HasZ: false

HasM: false

Has Attachments: false

Has Geometry Properties: false

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Object ID Field: OBJECTID

Unique ID Field:

Name : OBJECTID

IsSystemMaintained : True

Global ID Field:

Type ID Field:

Fields:

• OBJECTID (type: esriFieldTypeOID, alias: OBJECTID, SQL Type: sqlTypeOther, length: 0, nullable: false, editable: false)
• WB_ID (type: esriFieldTypeString, alias: WB_ID, SQL Type: sqlTypeOther, length: 254, nullable: true, editable: true)
• COLOR (type: esriFieldTypeString, alias: COLOR, SQL Type: sqlTypeOther, length: 254, nullable: true, editable: true)
• WB_NAME (type: esriFieldTypeString, alias: WB_NAME, SQL Type: sqlTypeOther, length: 254, nullable: true, editable: true)
• WB_DESC (type: esriFieldTypeString, alias: WB_DESC, SQL Type: sqlTypeOther, length: 254, nullable: true, editable: true)
• WB_CLASS (type: esriFieldTypeString, alias: WB_CLASS, SQL Type: sqlTypeOther, length: 254, nullable: true, editable: true)
• BEACH (type: esriFieldTypeString, alias: BEACH, SQL Type: sqlTypeOther, length: 254, nullable: true, editable: true)
• LABEL_TYP (type: esriFieldTypeString, alias: LABEL_TYP, SQL Type: sqlTypeOther, length: 16, nullable: true, editable: true)
• LABEL (type: esriFieldTypeString, alias: LABEL, SQL Type: sqlTypeOther, length: 16, nullable: true, editable: true)
• KEEP_FTYPE (type: esriFieldTypeString, alias: KEEP_FTYPE, SQL Type: sqlTypeOther, length: 16, nullable: true, editable: true)
• WSRpt_Crd (type: esriFieldTypeString, alias: WSRpt_Crd, SQL Type: sqlTypeOther, length: 20, nullable: true, editable: true)

Templates:

Name: auids_pnts_2018
Description:
Drawing Tool: esriFeatureEditToolPoint
Prototype:

Attributes:

Is Data Versioned: false

Has Contingent Values: false

Supports Rollback On Failure Parameter: true

Last Edit Date: 7/22/2026 6:41:06 PM

Schema Last Edit Date: 7/22/2026 6:41:05 PM

Data Last Edit Date: 7/22/2026 6:21:20 PM

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