View In:   ArcGIS Online Map Viewer

Name: 2025 Nitrate Contamination Risk Areas

Display Field: name

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: This layer identifies areas with high, medium, or low risk of groundwater nitrate contamination, based on the 2025 GAMA Aquifer Risk Map (ARM). Risk levels are derived from publicly available groundwater quality data collected from wells (e.g., monitoring, domestic, municipal, irrigation) at depths similar to domestic drinking water wells. The dataset also includes the number of domestic and State small water system wells per area.

Service Item Id: 709b01ff4d6943e790772255224fff27

Copyright Text: Ambient Monitoring and Assessment (GAMA)

Default Visibility: true

MaxRecordCount: 2000

MaxSelectionCount: 0

Supported Query Formats: JSON, geoJSON, PBF

Min Scale: 0.0

Max Scale: 0.0

Supports Advanced Queries: true

Supports Statistics: true

Can Scale Symbols: false

Use Standardized Queries: true

Supports ValidateSQL: true

Supports Calculate: true

Extent:

XMin: -1.38402030888E7
YMin: 3833637.1664000005
XMax: -1.27050574244E7
YMax: 5160514.790799998
Spatial Reference: 102100  (3857)  LatestVCSWkid(0)

Drawing Info:

Renderer:
Unique Value Renderer:
Field 1: wq_2025
Field 2: N/A
Field 3: N/A
Field Delimiter: ,
Default Symbol:
N/A
Default Label: N/A
UniqueValueInfos:
• Value: high
  Label: high (> comparison concentration)
  Description: N/A
  Symbol:
  Style: esriSFSSolid
  Color: [168, 0, 0, 255]
  Outline:
  N/A
• Value: medium
  Label: medium (80% - 100% of comparison concentration)
  Description: N/A
  Symbol:
  Style: esriSFSSolid
  Color: [255, 170, 0, 255]
  Outline:
  N/A
• Value: low
  Label: low (< 80% of comparison concentration)
  Description: N/A
  Symbol:
  Style: esriSFSSolid
  Color: [0, 92, 230, 255]
  Outline:
  N/A
Transparency: 0
Labeling Info:

Feature Draw Order:

N/A

Advanced Query Capabilities:

Supports Statistics: true
Supports OrderBy: true
Supports Distinct: true
Supports Pagination: true
Supports TrueCurve: false
Supports Returning Query Extent: true
Supports Query With Distance: true
Supports Sql Expression: true
Supports Query With ResultType: true
Supports Returning Geometry Centroid: true
Supports Binning LOD: true
Supports Query With LOD Spatial Reference: true
Supports Percentile Statistics: true
Supports Having Clause: true
Supports Count Distinct: true
Supports Time Relation: false
Supports Sql Format: false
Supports Query Analytic: true
Supports Query With Current User: true

HasZ: false

HasM: false

Has Attachments: false

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Type ID Field: wq_2025

Fields:

• fid ( nullable: false, defaultValue: null, editable: false, length: 4, type: esriFieldTypeOID, modelName: fid, alias: FID )
• join_count ( modelName: join_count, nullable: true, editable: true, defaultValue: null, alias: Join_Count, type: esriFieldTypeInteger )
• target_fid ( modelName: target_fid, nullable: true, editable: true, defaultValue: null, alias: TARGET_FID, type: esriFieldTypeInteger )
• countyf ( modelName: countyf, nullable: true, editable: true, defaultValue: null, length: 80, alias: countyf, type: esriFieldTypeString )
• name ( modelName: name, nullable: true, editable: true, defaultValue: null, length: 80, alias: name, type: esriFieldTypeString )
• namelsa ( modelName: namelsa, nullable: true, editable: true, defaultValue: null, length: 80, alias: namelsa, type: esriFieldTypeString )
• mtrs ( modelName: mtrs, nullable: true, editable: true, defaultValue: null, length: 80, alias: mtrs, type: esriFieldTypeString )
• gsa_id ( modelName: gsa_id, nullable: true, editable: true, defaultValue: null, alias: gsa_id, type: esriFieldTypeDouble )
• gsa_nam ( modelName: gsa_nam, nullable: true, editable: true, defaultValue: null, length: 80, alias: gsa_nam, type: esriFieldTypeString )
• gsp_id ( modelName: gsp_id, nullable: true, editable: true, defaultValue: null, alias: gsp_id, type: esriFieldTypeDouble )
• bsn_nmb ( modelName: bsn_nmb, nullable: true, editable: true, defaultValue: null, length: 80, alias: bsn_nmb, type: esriFieldTypeString )
• bsn_sbb ( modelName: bsn_sbb, nullable: true, editable: true, defaultValue: null, length: 80, alias: bsn_sbb, type: esriFieldTypeString )
• basn_nm ( modelName: basn_nm, nullable: true, editable: true, defaultValue: null, length: 80, alias: basn_nm, type: esriFieldTypeString )
• gm_chm_ ( modelName: gm_chm_, nullable: true, editable: true, defaultValue: null, length: 80, alias: gm_chm_, type: esriFieldTypeString )
• secdet ( modelName: secdet, nullable: true, editable: true, defaultValue: null, alias: secdet, type: esriFieldTypeDouble )
• re_undr ( modelName: re_undr, nullable: true, editable: true, defaultValue: null, alias: re_undr, type: esriFieldTypeDouble )
• re_clos ( modelName: re_clos, nullable: true, editable: true, defaultValue: null, alias: re_clos, type: esriFieldTypeDouble )
• re_over ( modelName: re_over, nullable: true, editable: true, defaultValue: null, alias: re_over, type: esriFieldTypeDouble )
• r_vg_vr ( modelName: r_vg_vr, nullable: true, editable: true, defaultValue: null, alias: r_vg_vr, type: esriFieldTypeDouble )
• method ( modelName: method, nullable: true, editable: true, defaultValue: null, length: 80, alias: method, type: esriFieldTypeString )
• avg_mcl ( modelName: avg_mcl, nullable: true, editable: true, defaultValue: null, alias: avg_mcl, type: esriFieldTypeDouble )
• wq_2025 ( modelName: wq_2025, nullable: true, editable: true, defaultValue: null, length: 80, alias: wq_2025, type: esriFieldTypeString )
• shape__len ( modelName: shape__len, nullable: true, editable: true, defaultValue: null, alias: SHAPE__Len, type: esriFieldTypeDouble )
• shape__are ( modelName: shape__are, nullable: true, editable: true, defaultValue: null, alias: SHAPE__Are, type: esriFieldTypeDouble )
• dwr_dm_ ( modelName: dwr_dm_, nullable: true, editable: true, defaultValue: null, alias: dwr_dm_, type: esriFieldTypeDouble )
• ssws_sm ( modelName: ssws_sm, nullable: true, editable: true, defaultValue: null, alias: ssws_sm, type: esriFieldTypeDouble )
• wq_2021 ( modelName: wq_2021, nullable: true, editable: true, defaultValue: null, length: 80, alias: wq_2021, type: esriFieldTypeString )
• wq_2022 ( modelName: wq_2022, nullable: true, editable: true, defaultValue: null, length: 80, alias: wq_2022, type: esriFieldTypeString )
• wq_2023 ( modelName: wq_2023, nullable: true, editable: true, defaultValue: null, length: 80, alias: wq_2023, type: esriFieldTypeString )
• wq_2024 ( modelName: wq_2024, nullable: true, editable: true, defaultValue: null, length: 80, alias: wq_2024, type: esriFieldTypeString )
• near_dist_ ( modelName: near_dist_, nullable: true, editable: true, defaultValue: null, alias: near_dist_, type: esriFieldTypeDouble )
• sabl_pwsid ( modelName: sabl_pwsid, nullable: true, editable: true, defaultValue: null, length: 10, alias: sabl_pwsid, type: esriFieldTypeString )
• water_syst ( modelName: water_syst, nullable: true, editable: true, defaultValue: null, length: 80, alias: water_syst, type: esriFieldTypeString )
• SHAPE__Length ( virtual: true, nullable: true, editable: false, defaultValue: null, alias: SHAPE__Length, type: esriFieldTypeDouble )
• SHAPE__Area ( virtual: true, nullable: true, editable: false, defaultValue: null, alias: SHAPE__Area, type: esriFieldTypeDouble )

Types:

ID: high
Name: high (> comparison concentration)
Domains:
Templates:
• Name: high
  Description:
  Prototype:
  dwr_dm_: null
  water_syst: null
  countyf: null
  re_clos: null
  ssws_sm: null
  target_fid: null
  near_dist_: null
  secdet: null
  avg_mcl: null
  join_count: null
  mtrs: null
  bsn_nmb: null
  gsa_id: null
  re_undr: null
  shape__len: null
  method: null
  shape__are: null
  wq_2022: null
  wq_2021: null
  bsn_sbb: null
  namelsa: null
  r_vg_vr: null
  wq_2025: high
  re_over: null
  wq_2024: null
  wq_2023: null
  gsa_nam: null
  basn_nm: null
  name: null
  gsp_id: null
  gm_chm_: null
  sabl_pwsid: null
  
  Drawing Tool: esriFeatureEditToolPolygon

---

ID: medium
Name: medium (80% - 100% of comparison concentration)
Domains:
Templates:
• Name: medium
  Description:
  Prototype:
  dwr_dm_: null
  water_syst: null
  countyf: null
  re_clos: null
  ssws_sm: null
  target_fid: null
  near_dist_: null
  secdet: null
  avg_mcl: null
  join_count: null
  mtrs: null
  bsn_nmb: null
  gsa_id: null
  re_undr: null
  shape__len: null
  method: null
  shape__are: null
  wq_2022: null
  wq_2021: null
  bsn_sbb: null
  namelsa: null
  r_vg_vr: null
  wq_2025: medium
  re_over: null
  wq_2024: null
  wq_2023: null
  gsa_nam: null
  basn_nm: null
  name: null
  gsp_id: null
  gm_chm_: null
  sabl_pwsid: null
  
  Drawing Tool: esriFeatureEditToolPolygon

---

ID: low
Name: low (< 80% of comparison concentration)
Domains:
Templates:
• Name: low
  Description:
  Prototype:
  dwr_dm_: null
  water_syst: null
  countyf: null
  re_clos: null
  ssws_sm: null
  target_fid: null
  near_dist_: null
  secdet: null
  avg_mcl: null
  join_count: null
  mtrs: null
  bsn_nmb: null
  gsa_id: null
  re_undr: null
  shape__len: null
  method: null
  shape__are: null
  wq_2022: null
  wq_2021: null
  bsn_sbb: null
  namelsa: null
  r_vg_vr: null
  wq_2025: low
  re_over: null
  wq_2024: null
  wq_2023: null
  gsa_nam: null
  basn_nm: null
  name: null
  gsp_id: null
  gm_chm_: null
  sabl_pwsid: null
  
  Drawing Tool: esriFeatureEditToolPolygon

---

Capabilities: Query

Sync Can Return Changes: true

Is Data Versioned: false

Supports Rollback On Failure: true

Supports ApplyEdits With Global Ids: false

Supports ApplyEdits By Upload Id: true

Supports Query With Historic Moment: false

Supports Coordinates Quantization: true

Child Resources:

Supported Operations:   Query   Query Attachments   Query Analytic   Query Top Features   Query Bins   Append   Validate SQL   Generate Renderer   Return Updates   Metadata   Update Metadata