/nwis/gwlevels/ was frozen 2025-11-01 and redirects to the decommission notice as of 2026-02-01. Sugra sources this from the OGC field-measurements collection - the official replacement.x-api-key: ********************curl --location '/api/v1/environment/usgs-water/gwlevels?site=282739099525401&start_date=2020-01-01&end_date=2024-12-31&limit=500' \
--header 'x-api-key: <api-key>'{
"data": {
"measurements": [
{
"site_id": "string",
"parameter_code": "string",
"parameter_name": "string",
"time": "string",
"value": 0,
"unit": "string",
"method": "string",
"approval_status": "string",
"property1": "string",
"property2": "string"
}
],
"count": 0,
"api_version": "string",
"note": "string",
"property1": "string",
"property2": "string"
},
"meta": {
"endpoint": "/api/v1/fred/us/cpi",
"data_time": "2026-04-16T14:30:00Z",
"response_time": "2026-04-16T14:30:12Z",
"provider": "Sugra API v1.0.1",
"source": "string",
"fallback_used": true,
"fallback_chain": [
"string"
],
"cached": true
}
}