Observed Water Level at a Tide Station (NOAA Tides & Currents)

noaacoops/water-level

The water level measured at a NOAA tide station over the last 1 to 24 hours, as 6-minute readings with the newest last: height above the chosen datum (MLLW by default), in metres or feet, with NOAA's quality flags and preliminary or verified marker. Station ids are 7 digits, for example 8454000 for Providence, RI or 9414290 for San Francisco. A station that does not measure water level returns a validation error. NOAA Tides & Currents data, passed through unmodified and served by Omnial; not an official NOAA product and not for navigation.

activeper callv1

Price

$0.00273 per call

You pay the price shown. If a call turns out to cost more than its quote, you pay the actual price, capped at twice the quote. No monthly minimum. Top-ups start at $5.

Data source

NOAA Tides & Currents

Data from NOAA's National Ocean Service, Center for Operational Oceanographic Products and Services (Tides & Currents), public domain per tidesandcurrents.noaa.gov/disclaimers.html. Served by Omnial; not an official NOAA product and not for navigation.

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agent

// 1. search: find the tool
omnial_search({ query: "what you need" })

// 2. inspect: price and input schema
omnial_inspect({ tool: "noaacoops/water-level" })

// 3. learn: read the usage guide at runtime
omnial_learn({ tool: "noaacoops/water-level" })

// 4. run: price the exact call first, then run it
omnial_execute({ tool: "noaacoops/water-level", input: { /* see input_schema */ }, dry_run: true })
omnial_execute({ tool: "noaacoops/water-level", input: { /* ... */ } })

// 5. settle: the call is charged when it finishes, nothing to do

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Pricing

Every charge this tool can incur.

Charge	Price
Per call	$0.00273

Updated: Oct 18, 2026

Input and output schemas

Input schema

input_schema.json

{
  "type": "object",
  "required": [
    "station"
  ],
  "properties": {
    "datum": {
      "enum": [
        "MLLW",
        "MLW",
        "MSL",
        "MTL",
        "MHW",
        "MHHW",
        "NAVD"
      ],
      "type": "string",
      "default": "MLLW",
      "description": "The tidal datum the height is measured from. MLLW is mean lower low water, the usual chart datum; MSL is mean sea level; NAVD is the North American Vertical Datum. Defaults to MLLW. A station without the datum is a validation error."
    },
    "hours": {
      "type": "integer",
      "default": 1,
      "maximum": 24,
      "minimum": 1,
      "description": "How many past hours of readings to return, ending now, 1 to 24. Defaults to 1, about 10 readings; the last one is the newest."
    },
    "units": {
      "enum": [
        "metric",
        "english"
      ],
      "type": "string",
      "default": "metric",
      "description": "metric is metres; english is feet. Defaults to metric."
    },
    "station": {
      "type": "string",
      "pattern": "^[A-Za-z0-9]{4,10}$",
      "description": "The NOAA CO-OPS station id, for example 8454000 (Providence, RI), 9414290 (San Francisco, CA) or 8518750 (The Battery, New York). Not every station measures water level; one that does not is a validation error."
    },
    "time_zone": {
      "enum": [
        "gmt",
        "lst",
        "lst_ldt"
      ],
      "type": "string",
      "default": "gmt",
      "description": "What the `t` timestamps mean: gmt is UTC; lst is the station's local standard time, ignoring daylight saving; lst_ldt is the station's local clock time including daylight saving. Defaults to gmt."
    }
  },
  "additionalProperties": false
}

Output schema

output_schema.json

{
  "type": "object",
  "required": [
    "metadata",
    "data"
  ],
  "properties": {
    "data": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "t",
          "v"
        ],
        "properties": {
          "f": {
            "type": "string",
            "description": "Four comma-separated data flags in the order O,F,R,L: O is the count of samples outside a 3-sigma band, and F (flat), R (rate of change) and L (limit) are 1 when the matching tolerance was exceeded."
          },
          "q": {
            "type": "string",
            "description": "Quality level: p is preliminary, v is verified."
          },
          "s": {
            "type": "string",
            "description": "Sigma: standard deviation of the 1-second samples behind the reading."
          },
          "t": {
            "type": "string",
            "description": "Reading time, 'YYYY-MM-DD HH:MM', in the requested time_zone. It carries no zone marker."
          },
          "v": {
            "type": "string",
            "description": "Water level height above the datum, in the requested units, as a string. May be empty when the sensor gave no value."
          }
        },
        "additionalProperties": true
      },
      "description": "One entry per 6-minute reading, oldest first, so the newest is last."
    },
    "metadata": {
      "type": "object",
      "properties": {
        "id": {
          "type": "string",
          "description": "The station id."
        },
        "lat": {
          "type": "string",
          "description": "Latitude in decimal degrees, as a string."
        },
        "lon": {
          "type": "string",
          "description": "Longitude in decimal degrees, as a string."
        },
        "name": {
          "type": "string",
          "description": "The station name."
        }
      },
      "additionalProperties": true
    }
  },
  "description": "NOAA CO-OPS's response: the station and the readings, oldest first. Every reading field is a string.",
  "additionalProperties": true
}