data api · England

EA Hydrology API

Hydrological station metadata and quality-labelled flow, level, groundwater and rainfall time series.

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Data offered docs-verified: river flow 15-min instantaneous (m3/s) · river flow daily mean/min/max (m3/s) · river level 15-min instantaneous (m) · river level daily min/max (m) · rainfall 15-min total (mm) · rainfall daily total (mm) · groundwater level dipped (mAOD) · groundwater level logged, sub-daily (mAOD) · water quality 15-min instantaneous: dissolved oxygen (% and mg/L), fDOM (RFU), blue-green algae (RFU), turbidity (NTU), chlorophyll (µg/L), conductivity (µS/cm), temperature (°C), ammonium (mg/L), nitrate (mg/L as N), pH
Coverage llm-inferred: England
Resolution docs-verified: typically 15 min (sub-daily) and daily
Formats docs-verified: JSON · CSV · GeoJSON · HTML · RDF/XML · Turtle
Access llm-inferred: No authentication (per catalogue); free; Open Government Licence 3.0

Use cases llm-inferred: FRA baseline flows and levels from nearest gauge · Rainfall and river level context for flood event review · Groundwater level baseline for site investigation or geotechnical assessment · Water quality baseline (dissolved oxygen, turbidity, nitrate) for ecological or pollution assessment
Audience llm-inferred: flood consultants · hydrologists · drainage engineers · ecologists · geotechnical engineers · GIS analysts

Constraints docs-verified: Hard limit of 2,000,000 rows per call that cannot be overridden; soft limit of 100,000 rows per call (overridable with _limit) · Hard limit is subject to review and may be reduced if the service is overloaded · Bulk downloads should use the batch API; otherwise keep to one non-batch request in flight at a time · Concurrency limits may be enforced per IP address, and excessive demand may lead to blocking · Logged groundwater sub-daily values may mix 15-min and hourly intervals · Station identifiers are not always unique; some stations need a composite key with a wiskiID · HTML views are intended for debugging and development, not for presentation to consumers

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Metadata observed 14/10/2026 · editorial seed