Environment Agency
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 (spec §74).
What Hydrionis uses it for
255,337 observations across 6 metrics currently reference this source.