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Independent · Est. 2026
THE PUBLIC RECORD · ORGANISED · SOS.CITY · SOS.cityThe public record of every place, organised.

Type a question, a place, a dataset or an agency. We answer from the record first, with sources. When we can't, Claude looks further.

VerifiedAPI · OwnBy address

Water Quality Portal (USGS NWIS + EPA WQX/STORET + USDA STEWARDS)

Surface and groundwater sample results from USGS, EPA and state agencies, filterable to LA County (countycode US:06:037).

Water Quality Portal (USGS NWIS + EPA WQX/STORET + USDA STEWARDS) is published by US Environmental Protection Agency for Los Angeles, California. It has an API (Own API); its update schedule isn't stated. Reuse: check terms. Check status: verified.

UpdatesNot stated
Last updatedNot stated
ReuseCheck terms
Get itOwn API

About this source

PublisherUS Environmental Protection Agency
Originalhttps://www.waterqualitydata.us/webservices_documentation/ ↗
PlaceLos Angeles, California · federal
ShelfWater
FormatsXML (default), CSV, TSV, XLSX, GeoJSON, KML/KMZ; zip=yes
Update ratenot stated
Located byMonitoring station (lat/long)
Licencenot stated
CheckedVerified: opened and matched by a person or our reviewer

Cite this source: US Environmental Protection Agency, “Water Quality Portal (USGS NWIS + EPA WQX/STORET + USDA STEWARDS)”, https://www.waterqualitydata.us/webservices_documentation/. Listed by SOS.city at https://sos.city/source/622 (verified).

Use it in your product

# Listed endpoint
curl "https://www.waterqualitydata.us/data/{Station|Result|Activity|Project}/search?"
Endpoint as listed by the publisher.
# Through SOS.city: this source and its neighbours, with publisher, licence and check status
curl https://api.sos.city/v1/sources/622 -H "Authorization: Bearer sos_…"

Same shelf, same place