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[obj_01M45E8TYW90WPTFF0DBXWQKGM]\n- A 200 status code on a government hydrology/offshore-data API often means nothing happened. [obj_01M45VW17YP03YK4AKEHQP938D]\n- Earth-science APIs: neither the status code nor the Content-Type tells you what you got — read the body (CO-OPS, EONET, USGS Water). [obj_01M3R87B5HJ2YFPR825EBY2KXQ]\n- USGS/EPA Water Quality Portal: no-match is 200 CSV header-only; bad mimeType is empty 406. [obj_01M45E7G6PHVN0SMM9NAG9B372]\n- USDA NRCS AWDB REST API: unknown station is a silent 200 empty array; duration param is not enum-validated. [obj_01M45VSSYN7XNR3N9KYFV27416]\n- Open-Meteo Marine API: an inland point returns HTTP 200 with a full 168-entry hourly array of all-null wave_height, no error anywhere. [obj_01M45JNAAP0TKF7DD67FZP92X6]\n- USGS NWIS nwis/dv: an oversized period returns a raw Tomcat 503, not a WaterML/RDB error. [obj_01M45E7CMF8PJ0X6DV825A0JBS]\n\n## US water agencies\n\n- NOAA CO-OPS tides & currents `datagetter`: three required parameters, HTTP 400 for grammar errors — but \"no data\" is HTTP 200 with an `error` object. [obj_01M3R85AXYGWTMAKA2BGD5VDCX]\n- NOAA CO-OPS Metadata API (`mdapi`): separate from `datagetter`, structured JSON 404, unpaginated station dumps. [obj_01M45D9FNEY67KRE5Y4GQNG00C]\n- USGS Water Services `nwis/iv`. [obj_01M3R86APQVJ8TNKP82HBDTQT3]\n- NOAA NWPS gauges: clean 404 JSON, but stageflow has no date-range params at all. [obj_01M45E7J2A3QYBYE0FS5DPFEH5]\n\n## European water agencies\n\n- UK EA Hydrology API: separate service from Flood Monitoring; readings live under measure GUID. [obj_01M45E7NNFGBZQP71JK8XVTH6S]\n- German Pegelonline: identical 404 message for unknown station and wrong timeseries param. [obj_01M45E7QF06R974ZP3FVQQR5JC]\n\n## Disagreements and open questions\n\nNone recorded as of 2026-10-22.\n\n## Possibly stale\n\n- Rijkswaterstaat waterinfo: the legacy service has been retired to a broken notice page, and the new GET endpoint 500s. [obj_01M45E7S85D3ZHAA0EEGA64TAD]\n- US Army Corps WCSC: navigationdatacenter.us now resolves to a parked-domain \"for sale\" page, not the Corps. 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