---
id: "usgs_site_number"
kind: "datatype"
status: "draft"
is_pii: false
categories: ["environment", "geo"]
country: ["US"]
langs: ["common"]
quality: 90
url: "https://registry.apicrafter.io/datatype/usgs_site_number"
---

# USGS water monitoring site number (NWIS) (`usgs_site_number`)

> **Draft.** Draft records have not been reviewed yet and may be incomplete or wrong; do not treat them as authoritative for legal or compliance decisions.

Number of a monitoring location (a stream gage, well, spring, lake or other site) in the National Water Information System of the US Geological Survey. Stream stations get a number in downstream order, usually 8 digits (a two-digit part number and a six-digit order number) and longer in dense networks; wells, springs and other sites get 15 digits, the latitude (ddmmss) and longitude (dddmmss) first assigned to the site and a two-digit sequence number. The number is unique only together with the agency code (USGS for most sites) and loses its leading zero in spreadsheets.

- Parent datatype: `waterstation`
- Personal data (PII): no
- Categories: Environment (protected areas, biodiversity, water, weather, emissions, waste) (environment), Geographic identifiers (geo)
- Countries: United States (US)
- Languages: Common to most languages (common)
- Classification: identifier

## Detection

Regular expression (Python `re`):

```
^[0-9]{8,15}$
```

## Examples

- `01646500` — Potomac River near Washington, DC, Little Falls pump station; USGS NWIS
- `09380000` — Colorado River at Lees Ferry, Arizona; USGS NWIS
- `01467200` — Delaware River at Penn's Landing, Philadelphia; Wikidata example
- `321804090244200` — USGS NADP raingage (MS10) near Clinton, Mississippi; Wikidata example
- `1646500` (invalid example) — Site 01646500 with the leading zero lost

## Mappings

- wikidata: `P13020`

## Translations

- ru: Номер пункта наблюдений USGS (NWIS): Номер пункта гидрологических наблюдений (гидропоста, скважины, родника) в Национальной системе водной информации Геологической службы США. От 8 до 15 цифр; 15-значные номера строятся из координат.

## Sources

- wikidata: <https://www.wikidata.org/wiki/Property:P13020>
- doc: <https://pubs.usgs.gov/wdr/2005/wdr-ak-05-1/PDFonly/htdocs2005/explanrecord.html>
- doc: <https://waterservices.usgs.gov/docs/site-service/>

## Quality

Score 90/100. Missing: detector coverage.

JSON: <https://registry.apicrafter.io/api/v1/datatypes/usgs_site_number.json> · Edit: <https://github.com/apicrafter/metacrafter-registry/edit/main/data/datatypes/US/environment/usgs_site_number.yaml>