U.S. Geological Survey Monitoring Locations API

openapi: 3.2.0
info:
  title: U S Geological Survey Monitoring Locations API
  x-refined-note:
  - x-generated-from differs across the merged source definitions and was not carried
  - x-keywords differs across the merged source definitions and was not carried
  version: '1.0'
  description: 'Operations tagged Monitoring Locations across 2 of this provider''s published API definitions: u-s-geological-survey-monitoring-locations-api-openapi.yml, u-s-geological-survey-water-data-ogc-api-openapi.yml. Each path carries the servers of the definition it was published in.'
servers:
- url: https://earthquake.usgs.gov/fdsnws/event/1
  description: USGS FDSN Event Web Service
- description: 'The United States Geological Survey (USGS) collects water data at monitoring locations across the United States using both automated sensors and manual data collection. These APIs provide access to that data, alongside metadata about data collections and monitoring locations, in standardized machine-readable formats.

    '
  url: https://api.waterdata.usgs.gov/ogcapi/v0
tags:
- name: Monitoring Locations
  description: USGS stream gages, groundwater wells, and other water monitoring stations.
paths:
  /collections/monitoring-locations/items:
    get:
      operationId: getMonitoringLocations
      summary: USGS Water Data Get Monitoring Locations
      description: Retrieve USGS water monitoring locations (stream gages, groundwater wells, springs, etc.) as GeoJSON features. Supports spatial filtering by bounding box, attribute filtering by state/county/HUC, and pagination.
      tags:
      - Monitoring Locations
      parameters:
      - $ref: '#/components/parameters/bbox'
      - $ref: '#/components/parameters/limit'
      - $ref: '#/components/parameters/offset'
      - $ref: '#/components/parameters/format'
      - name: stateCd
        in: query
        required: false
        description: Two-letter U.S. state or territory FIPS code (e.g., CA, TX, NY).
        schema:
          type: string
          example: CA
      - name: huc
        in: query
        required: false
        description: Hydrologic Unit Code (2-12 digits) to filter by watershed.
        schema:
          type: string
          example: '18010103'
      - name: siteType
        in: query
        required: false
        description: USGS site type code (ST for streams, GW for groundwater, LK for lakes, AT for atmosphere, WE for wetlands, etc.).
        schema:
          type: string
          example: ST
      - name: agencyCd
        in: query
        required: false
        description: Agency code (default USGS).
        schema:
          type: string
          example: USGS
      responses:
        '200':
          description: GeoJSON FeatureCollection of monitoring locations.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MonitoringLocationCollection'
              examples:
                GetMonitoringLocations200Example:
                  summary: Default getMonitoringLocations 200 response
                  x-microcks-default: true
                  value:
                    type: FeatureCollection
                    features:
                    - type: Feature
                      geometry:
                        type: Point
                        coordinates:
                        - -122.419
                        - 37.775
                      properties:
                        monitoringLocationIdentifier: USGS-11169025
                        monitoringLocationName: GUADALUPE R AB HWY 237 NR ALVISO CA
                        monitoringLocationTypeName: Stream
                        hucEightDigitCode: '18050001'
                        stateFIPSCode: '06'
                        countryCode: US
                        drainageAreaMeasure: 850.0
                        drainageAreaMeasureUnitCode: sq mi
                        siteWebAddress: https://waterdata.usgs.gov/nwis/inventory?agency_code=USGS&site_no=11169025
        '400':
          description: Invalid request parameters.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '403':
          description: API key missing or unauthorized.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '429':
          description: Rate limit exceeded.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
    options:
      description: 'Location information is basic information about the monitoring location including the name, identifier, agency responsible for data collection, and the date the location was established. It also includes information about the type of location, such as stream, lake, or groundwater, and geographic information about the location, such as state, county, latitude and longitude, and hydrologic unit code (HUC).

        '
      operationId: optionsMonitoring-locationsFeatures
      responses:
        '200':
          description: options response
      security:
      - ApiKeyQuery: []
      - ApiKeyHeader: []
      summary: Options for Monitoring locations items
      tags:
      - Monitoring Locations
    post:
      description: 'Location information is basic information about the monitoring location including the name, identifier, agency responsible for data collection, and the date the location was established. It also includes information about the type of location, such as stream, lake, or groundwater, and geographic information about the location, such as state, county, latitude and longitude, and hydrologic unit code (HUC).

        '
      operationId: getCQL2Monitoring-locationsFeatures
      requestBody:
        content:
          application/json:
            schema:
              $ref: https://schemas.opengis.net/cql2/1.0/cql2.json
        description: Get items with CQL2
        required: true
      responses:
        '200':
          $ref: '#/components/responses/MonitoringLocationsFeatures'
        '400':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/InvalidParameter
        '403':
          $ref: '#/components/responses/Forbidden403'
        '429':
          $ref: '#/components/responses/TooManyRequests429'
        '500':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/ServerError
      security:
      - ApiKeyQuery: []
      - ApiKeyHeader: []
      summary: Get Monitoring locations items with CQL2
      tags:
      - Monitoring Locations
    servers:
    - url: https://earthquake.usgs.gov/fdsnws/event/1
      description: USGS FDSN Event Web Service
  /collections/monitoring-locations/items/{featureId}:
    get:
      operationId: getMonitoringLocation
      summary: USGS Water Data Get Monitoring Location by ID
      description: Retrieve a single USGS water monitoring location by its feature identifier (site number with agency prefix, e.g., USGS-11169025).
      tags:
      - Monitoring Locations
      parameters:
      - name: featureId
        in: path
        required: true
        description: Monitoring location identifier in format AGENCY-SITENUMBER (e.g., USGS-11169025).
        schema:
          type: string
          example: USGS-11169025
      - $ref: '#/components/parameters/format'
      responses:
        '200':
          description: Single monitoring location GeoJSON Feature.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MonitoringLocationFeature'
              examples:
                GetMonitoringLocation200Example:
                  summary: Default getMonitoringLocation 200 response
                  x-microcks-default: true
                  value:
                    type: Feature
                    geometry:
                      type: Point
                      coordinates:
                      - -122.419
                      - 37.775
                    properties:
                      monitoringLocationIdentifier: USGS-11169025
                      monitoringLocationName: GUADALUPE R AB HWY 237 NR ALVISO CA
                      monitoringLocationTypeName: Stream
        '403':
          description: API key missing or unauthorized.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '404':
          description: Monitoring location not found.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
    options:
      description: 'Location information is basic information about the monitoring location including the name, identifier, agency responsible for data collection, and the date the location was established. It also includes information about the type of location, such as stream, lake, or groundwater, and geographic information about the location, such as state, county, latitude and longitude, and hydrologic unit code (HUC).

        '
      operationId: optionsMonitoring-locationsFeature
      parameters:
      - $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/parameters/featureId
      responses:
        '200':
          description: options response
      security:
      - ApiKeyQuery: []
      - ApiKeyHeader: []
      summary: Options for Monitoring locations item by id
      tags:
      - Monitoring Locations
    servers:
    - url: https://earthquake.usgs.gov/fdsnws/event/1
      description: USGS FDSN Event Web Service
  /collections/monitoring-locations:
    get:
      description: 'Location information is basic information about the monitoring location including the name, identifier, agency responsible for data collection, and the date the location was established. It also includes information about the type of location, such as stream, lake, or groundwater, and geographic information about the location, such as state, county, latitude and longitude, and hydrologic unit code (HUC).

        '
      operationId: describeMonitoring-locationsCollection
      parameters:
      - $ref: '#/components/parameters/f'
      - $ref: '#/components/parameters/lang'
      responses:
        '200':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/Collection
        '400':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/InvalidParameter
        '403':
          $ref: '#/components/responses/Forbidden403'
        '404':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/NotFound
        '429':
          $ref: '#/components/responses/TooManyRequests429'
        '500':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/ServerError
      summary: Get Monitoring locations metadata
      tags:
      - Monitoring Locations
    servers:
    - description: 'The United States Geological Survey (USGS) collects water data at monitoring locations across the United States using both automated sensors and manual data collection. These APIs provide access to that data, alongside metadata about data collections and monitoring locations, in standardized machine-readable formats.

        '
      url: https://api.waterdata.usgs.gov/ogcapi/v0
  /collections/monitoring-locations/queryables:
    get:
      description: 'Location information is basic information about the monitoring location including the name, identifier, agency responsible for data collection, and the date the location was established. It also includes information about the type of location, such as stream, lake, or groundwater, and geographic information about the location, such as state, county, latitude and longitude, and hydrologic unit code (HUC).

        '
      operationId: getMonitoring-locationsQueryables
      parameters:
      - description: The properties that should be included. The parameter value is a comma-separated list of property names.
        explode: false
        in: query
        name: properties
        required: false
        schema:
          items:
            enum:
            - id
            - agency_code
            - agency_name
            - monitoring_location_number
            - monitoring_location_name
            - district_code
            - country_code
            - country_name
            - state_code
            - state_name
            - county_code
            - county_name
            - minor_civil_division_code
            - site_type_code
            - site_type
            - hydrologic_unit_code
            - basin_code
            - altitude
            - altitude_accuracy
            - altitude_method_code
            - altitude_method_name
            - vertical_datum
            - vertical_datum_name
            - horizontal_positional_accuracy_code
            - horizontal_positional_accuracy
            - horizontal_position_method_code
            - horizontal_position_method_name
            - original_horizontal_datum
            - original_horizontal_datum_name
            - drainage_area
            - contributing_drainage_area
            - time_zone_abbreviation
            - uses_daylight_savings
            - construction_date
            - aquifer_code
            - national_aquifer_code
            - aquifer_type_code
            - well_constructed_depth
            - hole_constructed_depth
            - depth_source_code
            - revision_note
            - revision_created
            - revision_modified
            type: string
          type: array
        style: form
      - $ref: '#/components/parameters/f'
      - description: The profile to be applied to a given request
        explode: false
        in: query
        name: profile
        required: false
        schema:
          enum:
          - actual-domain
          - valid-domain
          type: string
        style: form
      - $ref: '#/components/parameters/lang'
      responses:
        '200':
          $ref: '#/components/responses/Queryables'
        '400':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/InvalidParameter
        '403':
          $ref: '#/components/responses/Forbidden403'
        '404':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/NotFound
        '429':
          $ref: '#/components/responses/TooManyRequests429'
        '500':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/ServerError
      security:
      - ApiKeyQuery: []
      - ApiKeyHeader: []
      summary: Get Monitoring locations queryables
      tags:
      - Monitoring Locations
    servers:
    - description: 'The United States Geological Survey (USGS) collects water data at monitoring locations across the United States using both automated sensors and manual data collection. These APIs provide access to that data, alongside metadata about data collections and monitoring locations, in standardized machine-readable formats.

        '
      url: https://api.waterdata.usgs.gov/ogcapi/v0
  /collections/monitoring-locations/schema:
    get:
      description: 'Location information is basic information about the monitoring location including the name, identifier, agency responsible for data collection, and the date the location was established. It also includes information about the type of location, such as stream, lake, or groundwater, and geographic information about the location, such as state, county, latitude and longitude, and hydrologic unit code (HUC).

        '
      operationId: getMonitoring-locationsSchema
      parameters:
      - $ref: '#/components/parameters/f'
      - $ref: '#/components/parameters/lang'
      responses:
        '200':
          $ref: '#/components/responses/Queryables'
        '400':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/InvalidParameter
        '403':
          $ref: '#/components/responses/Forbidden403'
        '404':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/NotFound
        '429':
          $ref: '#/components/responses/TooManyRequests429'
        '500':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/ServerError
      security:
      - ApiKeyQuery: []
      - ApiKeyHeader: []
      summary: Get Monitoring locations schema
      tags:
      - Monitoring Locations
    servers:
    - description: 'The United States Geological Survey (USGS) collects water data at monitoring locations across the United States using both automated sensors and manual data collection. These APIs provide access to that data, alongside metadata about data collections and monitoring locations, in standardized machine-readable formats.

        '
      url: https://api.waterdata.usgs.gov/ogcapi/v0
components:
  schemas:
    MonitoringLocationFeature:
      title: MonitoringLocationFeature
      type: object
      description: GeoJSON Feature for a single USGS water monitoring location.
      properties:
        type:
          type: string
          description: GeoJSON type.
          example: Feature
        geometry:
          type: object
          description: GeoJSON Point geometry with longitude and latitude.
          properties:
            type:
              type: string
              example: Point
            coordinates:
              type: array
              items:
                type: number
              example:
              - -122.419
              - 37.775
        properties:
          $ref: '#/components/schemas/MonitoringLocationProperties'
    MonitoringLocationCollection:
      title: MonitoringLocationCollection
      type: object
      description: GeoJSON FeatureCollection of USGS monitoring locations.
      properties:
        type:
          type: string
          description: GeoJSON type.
          example: FeatureCollection
        features:
          type: array
          items:
            $ref: '#/components/schemas/MonitoringLocationFeature'
        numberMatched:
          type: integer
          description: Total number of matching locations.
          example: 8423
        numberReturned:
          type: integer
          description: Number of locations returned.
          example: 100
    ErrorResponse:
      title: ErrorResponse
      type: object
      description: Standard OGC API error response.
      properties:
        code:
          type: string
          description: Error code.
          example: InvalidParameter
        description:
          type: string
          description: Human-readable error description.
          example: Invalid value for parameter bbox.
    MonitoringLocationProperties:
      title: MonitoringLocationProperties
      type: object
      description: Attributes describing a USGS water monitoring location.
      properties:
        monitoringLocationIdentifier:
          type: string
          description: Unique identifier in format AGENCY-SITENUMBER.
          example: USGS-11169025
        monitoringLocationName:
          type: string
          description: Name of the monitoring location.
          example: GUADALUPE R AB HWY 237 NR ALVISO CA
        monitoringLocationTypeName:
          type: string
          description: Type of monitoring location (Stream, Well, Lake, etc.).
          example: Stream
        hucEightDigitCode:
          type: string
          description: 8-digit Hydrologic Unit Code for the location's watershed.
          example: '18050001'
        stateFIPSCode:
          type: string
          description: Two-digit state FIPS code.
          example: '06'
        countryCode:
          type: string
          description: ISO 3166-1 alpha-2 country code.
          example: US
        drainageAreaMeasure:
          type: number
          description: Drainage area measurement value.
          example: 850.0
        drainageAreaMeasureUnitCode:
          type: string
          description: Unit code for drainage area.
          example: sq mi
        siteWebAddress:
          type: string
          description: URL for the USGS NWIS site page.
          example: https://waterdata.usgs.gov/nwis/inventory?agency_code=USGS&site_no=11169025
    MonitoringLocationsFeature:
      properties:
        geometry:
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/schemas/geometryGeoJSON
        id:
          type: string
        properties:
          properties:
            agency_code:
              description: 'The agency that is reporting the data. Agency codes are fixed values assigned by the National Water Information System (NWIS). A list of agency codes is available at [https://api.waterdata.usgs.gov/ogcapi/v0/collections/agency-codes/items](https://api.waterdata.usgs.gov/ogcapi/v0/collections/agency-codes/items).

                '
              title: Agency code
              type:
              - string
              - 'null'
            agency_name:
              description: 'The name of the agency that is reporting the data.

                '
              title: Agency name
              type:
              - string
              - 'null'
            altitude:
              description: 'Altitude of the monitoring location referenced to the specified Vertical Datum.

                '
              title: Altitude
              type:
              - number
              - 'null'
            altitude_accuracy:
              description: 'Accuracy of the altitude, in feet. An accuracy of +/- 0.1 foot would be entered as “.1”. Many altitudes are interpolated from the contours on topographic maps; accuracies determined in this way are generally entered as one-half of the contour interval.

                '
              title: Altitude accuracy
              type:
              - number
              - 'null'
            altitude_method_code:
              description: 'Codes representing the method used to measure altitude.

                '
              title: Altitude method code
              type:
              - string
              - 'null'
            altitude_method_name:
              description: 'The name of the method used to measure altitude.

                '
              title: Altitude method name
              type:
              - string
              - 'null'
            aquifer_code:
              description: 'Local aquifers in the USGS water resources data base are identified by a geohydrologic unit code (a three-digit number related to the age of the formation, followed by a 4 or 5 character abbreviation for the geologic unit or aquifer name).

                '
              title: Aquifer code
              type:
              - string
              - 'null'
            aquifer_type_code:
              description: 'Describes the confinement status of an aquifer at the monitoring location. A confined aquifer is an aquifer below the land surface that is saturated with water. A water table--or unconfined--aquifer is an aquifer whose upper water surface (water table) is at atmospheric pressure, and thus is able to rise and fall.

                '
              title: Aquifer type code
              type:
              - string
              - 'null'
            basin_code:
              description: 'The Basin Code or "drainage basin code" is a two-digit code that further subdivides the 8-digit hydrologic-unit code. The drainage basin code is defined by the USGS State Office where the monitoring location is located.

                '
              title: Basin code
              type:
              - string
              - 'null'
            construction_date:
              description: 'Date the well was completed.

                '
              title: Construction date
              type:
              - string
              - 'null'
            contributing_drainage_area:
              description: 'The contributing drainage area of a lake, stream, wetland, or estuary monitoring location, in square miles. This item should be present only if the contributing area is different from the total drainage area. This situation can occur when part of the drainage area consists of very porous soil or depressions that either allow all runoff to enter the groundwater or traps the water in ponds so that rainfall does not contribute to runoff. A transbasin diversion can also affect the total drainage area.

                '
              title: Contributing drainage area
              type:
              - number
              - 'null'
            country_code:
              description: 'The code for the country in which the monitoring location is located.

                '
              title: Country code
              type:
              - string
              - 'null'
            country_name:
              description: 'The name of the country in which the monitoring location is located.

                '
              title: Country name
              type:
              - string
              - 'null'
            county_code:
              description: 'The code for the county or county equivalent (parish, borough, etc.) in which the monitoring location is located. A list of codes is available at [https://api.waterdata.usgs.gov/ogcapi/v0/collections/counties/items](https://api.waterdata.usgs.gov/ogcapi/v0/collections/counties/items).

                '
              title: County code
              type:
              - string
              - 'null'
            county_name:
              description: 'The name of the county or county equivalent (parish, borough, etc.) in which the monitoring location is located. [A list of codes is available at [https://api.waterdata.usgs.gov/ogcapi/v0/collections/counties/items](https://api.waterdata.usgs.gov/ogcapi/v0/collections/counties/items).

                '
              title: County name
              type:
              - string
              - 'null'
            depth_source_code:
              description: 'A code indicating the source of water-level data.

                '
              title: Depth source code
              type:
              - string
              - 'null'
            district_code:
              description: 'The Water Science Centers (WSCs) across the United States use the FIPS state code as the district code. In some case, monitoring locations and samples may be managed by a water science center that is adjacent to the state in which the monitoring location actually resides. For example a monitoring location may have a district code of 30 which translates to Montana, but the state code could be 56 for Wyoming because that is where the monitoring location actually is located.

                '
              title: District code
              type:
              - string
              - 'null'
            drainage_area:
              description: 'The area enclosed by a topographic divide from which direct surface runoff from precipitation normally drains by gravity into the stream above that point.

                '
              title: Drainage area
              type:
              - number
              - 'null'
            hole_constructed_depth:
              description: 'The total depth to which the hole is drilled, in feet below land surface datum. Note: Not all groundwater monitoring locations have information on Hole Depth. Such monitoring locations will not be retrieved using this search criteria.

                '
              title: Hole constructed depth
              type:
              - number
              - 'null'
            horizontal_position_method_code:
              description: 'Indicates the method used to determine latitude longitude values. A list of codes is available at [https://api.waterdata.usgs.gov/ogcapi/v0/collections/coordinate-method-codes/items](https://api.waterdata.usgs.gov/ogcapi/v0/collections/coordinate-method-codes/items).

                '
              title: Horizontal position method code
              type:
              - string
              - 'null'
            horizontal_position_method_name:
              description: 'Indicates the method used to determine latitude longitude values. A list of codes is available at [https://api.waterdata.usgs.gov/ogcapi/v0/collections/coordinate-method-codes/items](https://api.waterdata.usgs.gov/ogcapi/v0/collections/coordinate-method-codes/items).

                '
              title: Horizontal position method name
              type:
              - string
              - 'null'
            horizontal_positional_accuracy:
              description: 'Indicates the accuracy of the latitude longitude values. A list of codes is available at [https://api.waterdata.usgs.gov/ogcapi/v0/collections/coordinate-accuracy-codes/items](https://api.waterdata.usgs.gov/ogcapi/v0/collections/coordinate-accuracy-codes/items).

                '
              title: Horizontal positional accuracy
              type:
              - string
              - 'null'
            horizontal_positional_accuracy_code:
              description: 'Indicates the accuracy of the latitude longitude values. A list of codes is available at [https://api.waterdata.usgs.gov/ogcapi/v0/collections/coordinate-accuracy-codes/items](https://api.waterdata.usgs.gov/ogcapi/v0/collections/coordinate-accuracy-codes/items).

                '
              title: Horizontal positional accuracy code
              type:
              - string
              - 'null'
            hydrologic_unit_code:
              description: 'The hydrologic unit code (HUC) for the monitoring location. Supports prefix matching — querying with a shorter HUC (e.g. "04") matches all locations within that hydrologic region.

                '
              title: Hydrologic unit code (HUC)
              type:
              - string
              - 'null'
            id:
              description: 'A unique identifier representing a single monitoring location. This corresponds to the `monitoring_location_id` field in other endpoints. Monitoring location IDs are created by combining the agency code of the agency responsible for the monitoring location (e.g. USGS) with the ID number of the monitoring location (e.g. 02238500), separated by a hyphen (e.g. USGS-02238500).

                '
              title: Monitoring location ID
              type:
              - string
              - 'null'
            minor_civil_division_code:
              description: 'Codes for primary governmental or administrative divisions of the county or county equivalent in which the monitoring location is located.

                '
              title: Minor civil division code
              type:
              - string
              - 'null'
            monitoring_location_name:
              description: 'This is the official name of the monitoring location in the database. For well information this can be a district-assigned local number.

                '
              title: Monitoring location name
              type:
              - string
              - 'null'
            monitoring_location_number:
              description: 'Each monitoring location in the USGS data base has a unique 8- to 15-digit identification number.

                '
              title: Monitoring location number
              type:
              - string
              - 'null'
            national_aquifer_code:
              description: 'National aquifers are the principal aquifers or aquifer systems in the United States, defined as regionally extensive aquifers or aquifer systems that have the potential to be used as a source of potable water. Not all groundwater monitoring locations can be associated with a National Aquifer. Such monitoring locations w

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# Full source: https://raw.githubusercontent.com/api-evangelist/u-s-geological-survey/refs/heads/main/openapi/u-s-geological-survey-monitoring-locations-api-openapi.yml