Water Quality Archive (WIMS)
Open archive of discrete water quality sampling in England: rivers, lakes, estuaries, coastal waters, groundwater and effluent discharges, with results for several hundred determinands including nutrients, metals, pesticides and physico-chemical parameters. Tens of millions of individual measurements.
Rights
- Licence
- Open Government Licence v3.0
- Commercial reuse
- Yes
- Redistribution
- Yes
- Derivative use
- Yes
- Attribution required
- YesContains public sector information licensed under the Open Government Licence v3.0.
- Terms last checked
- 23 August 2026
Access and coverage
- Publisher
- Environment Agency
- Geographic coverage
- England — sampling point level
- Temporal coverage
- 2000 onwards
- Update frequency
- monthly
- Formats
- csv, json, api
- Bulk download
- Available
- Registration required
- No
- Cost to Hydrionis
- Free
- Domains
- quality, chemistry, contaminant
Notes
One of the largest genuinely open water chemistry archives anywhere. Its native geography is the individual sampling point, which is why Hydrionis aggregates it to catchment or waterbody for display rather than generating a page per sampling point.
What Hydrionis holds from this publisher
The publisher’s own coverage is above. This is what Hydrionis has actually taken from it, at the subjects it measures — gauges, boreholes, reservoirs or places.
What is measured
- Alkalinity · mg/l as CaCO₃
- Aluminium, dissolved · µg/l
- Ammoniacal nitrogen · mg/l as N
- Arsenic, dissolved · µg/l
- Biochemical oxygen demand (5 day, ATU) · mg/l
- Cadmium, dissolved · µg/l
- Calcium, dissolved · mg/l
- Chloride in river water · mg/l
- Chromium, dissolved · µg/l
- Copper, dissolved · µg/l
- Dissolved organic carbon · mg/l as C
- Dissolved oxygen · mg/l
- and 21 further measurements
How current it is
- Current
- Read from EA 38 days ago, and the newest annual value covers 2025 — as current as this source gets.
Hydrionis products built from it
Where this publisher’s data reaches a reader. Each has its own page, with its licence and how to cite it.