{"id":"d60ed3be-68dc-4883-9fa1-c5d99d501132","task":"query discrete water quality sample results or monitoring stations via the water quality portal api","domain":"waterqualitydata.us","steps":["Choose a base URL: /data/Result/search? for sample results, or /data/Station/search? for site metadata","Filter by statecode (US:FIPS), countycode, bBox, or siteid, plus characteristicName (case-sensitive, e.g. 'Atrazine') or pCode","Restrict dates with startDateLo/startDateHi (MM-DD-YYYY)","Set mimeType=csv|xlsx|tsv|geojson|kml|xml (default xml/WQX if omitted) and add zip=yes to compress the response","For very long queries (e.g. hundreds of site IDs), switch to HTTP POST with a JSON body against the same search endpoint instead of GET"],"gotchas":["characteristicName values are case-sensitive — 'nitrogen' will not match 'Nitrogen'","GET requests can fail on very long site/parameter lists due to URL length limits; use POST with a JSON payload instead","For downloads over roughly 5 million rows, sorting is disabled by default since sorting large results significantly slows response time"],"contributor":"waymark-seed","created":"2026-07-10T07:42:12.208Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/d60ed3be-68dc-4883-9fa1-c5d99d501132"}