Before quoting a water-quality figure for Rotterdam, keep the reporting period and named location beside it. A number copied from a utility page can lose its meaning when those details disappear. The date you opened a report is not automatically the date its water was sampled.
Evides' drinking-water page offers a postcode lookup for water quality. Its explanation of the lookup says the information concerns the production location serving the surrounding area. That scope is worth retaining before treating a result as a test of an individual hotel tap.
Find the reporting window inside the document
The utility's PFAS results index separates named sources from production locations and links to their documents. A source-water record and a produced drinking-water record should keep those identities when you compare them.
Its linked Kralingen report names Kralingen as the production location and gives a reporting-period start of 3 October 2025. The monthly columns run from October 2025 through September 2026. The document does not state an exact last individual sampling date.
Keep the start date and the monthly headings together. The last month shown in a summary does not identify the collection day of every observation behind it. If you need a particular day's result, ask the utility for the record that actually answers that question.
Keep location and units attached to a result
The Kralingen document distinguishes ng/l from ng/l expressed as PFOA equivalents. It also presents counts, minima, means and maxima in separate columns. Preserve the full parameter and unit when copying a value; the two unit conventions should not be silently treated as the same calculation.
Its lower-bound footnote says results below the reporting limit are set to zero in the calculation. A displayed zero therefore should not be reworded as proof that a substance was wholly absent. Read the footnotes before turning a table cell into a claim.
The report's named production location still does not establish the precise supply to a particular building. Use the postcode lookup or ask Evides to identify which location's information is relevant. Do not choose a report merely because its place name is familiar or appears near an accommodation on a map.
An older pooled average keeps its older period
Evides' explanation page also describes averages across four production locations using Maas water, covering 2016 through October 2019. Those historical pooled figures are different records from the linked Kralingen reporting window. Reading both pages today does not make their periods or geographic scopes match.
For a later comparison, ask whether each figure concerns one production location or a pooled group. Then check that the parameter, unit and period agree. If one of those details is missing, keep the uncertainty in your explanation instead of filling it with an assumed date or location.
For a question about the water at an accommodation now, give Evides the relevant postcode, location and concern. A report can explain a set of measured results without resolving a new household question. The Rotterdam city guide provides general travel context; retain the utility's exact record and scope for a detailed water-data inquiry.
