NAWA Trend

NAWA Trend is the national long-term monitoring of micropollutants in Swiss surface waters, operated under the National Surface Water Quality Monitoring Programme (NAWA) of the FOEN. The dataset exposes stations and individual measurement results.

Result order and pagination

Results are returned in no particular order and a single query is capped at 10 000 rows. Queries that exceed the cap are rejected rather than truncated. Larger datasets are retrieved by partitioning into smaller filter windows (typically a date range) and iterating. See Pagination for details.

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Available fields

Field	Type	Notes
id	String	Station identifier.
name	String	Station name.
waterBodyName	String	Water body name.
canton	String	Two-letter Swiss canton code (e.g. BE, ZH, VD).
xCoordinateLv95	String	X coordinate (Swiss LV95) as a string.
yCoordinateLv95	String	Y coordinate (Swiss LV95) as a string.
predecessor	String	Identifier of the predecessor station, if any.
successor	String	Identifier of the successor station, if any.

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Available fields

Field	Type	Notes
stationId	String	Station identifier (matches id on the stations type).
stationName	String	Station name (denormalised).
samplingLocation	String	Free-text sampling location.
samplingType	String	Sampling type, e.g. Stichprobe (grab sample), Mischprobe (composite sample).
naquaSamplingDate	String	Sampling date in the NAQUA format.
naquaSamplingTime	String	Sampling time in the NAQUA format.
nawaSamplingStartTs	AWSDateTime	Sampling start timestamp (ISO-8601 UTC).
nawaSamplingEndTs	AWSDateTime	Sampling end timestamp (ISO-8601 UTC).
nawaSamplingDurationHours	String	Sampling duration in hours.
laboratory	String	Analysing laboratory.
surveyFieldLab	String	Field laboratory identifier.
measuredParameter	String	Analyte name (German), e.g. Atrazin, Nitrit-Stickstoff, Chlorid, Elektrische Leitfähigkeit, ortho-Phosphat-Phosphor (filtriert).
measuredValue	String	Measured value as a string (units in unit).
determinationLimit	String	Quantification limit.
nawaDetectionLimit	String	NAWA detection limit.
unit	String	Measurement unit, e.g. mg/l, µg/l, µS20, m³/s.
measurementUncertaintyAbsoluteRelative	String	Whether the uncertainty is absolute or relative.
measurementUncertainty	String	Reported measurement uncertainty.
deviceMethod	String	Device / analytical method.
measuredValueRemark	String	Free-text remark on the measured value.

Download data

The measurement results are available as prepared files (.csv, one dataset per year) for direct download; the parameter register and the station list are also available. For targeted, filtered extracts, use the GraphQL API.

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Notes

• The nawa_trend namespace additionally exposes a parameters(...) field containing parameter dictionary entries (CAS, InChIKey, molar mass, multilingual designations).
• The data query can be narrowed by measuredParameter (e.g. { _eq: "Atrazin" }) or by samplingType.
• For long series the request is split into nawaSamplingStartTs windows that each stay under 10 000 rows. See the note above.

Contact

Questions about the content of this dataset can be addressed to the FOEN — see Contact.