Groundwater monitoring wells in the BRO by year built: 2,786 wells in 2025, 2.2 times as much as in 1990

Groundwater monitoring wells in the BRO by year built, 1990 – 2025, in wells. The highest point was 2022 (3,698).

Source: TNO, Basisregistratie Ondergrond: grondwatermonitoring in samenhang via PDOK (OGC API) · opgehaald 25 oktober 2026 · selection: 97.900 putten in de BRO; 2.186 zonder bouwjaar, 12.001 inmiddels verwijderd (tellen mee bij hun bouwjaar); alleen volle jarenOpen the table Single block

These figures come from

Key Register of the Subsurface (BRO)

TNO Geologische Dienst Nederland

The national register of what lies underground and what is measured there: cone penetration tests, geological, soil and geotechnical boreholes, groundwater monitoring wells with their time series (some from the 1950s), groundwater composition, abstractions and mining permits. Government bodies must have their surveys registered here; TNO runs the national facility on behalf of the Ministry of the Interior (BZK). Fourteen REST services on publiek.broservices.nl, each with an OpenAPI description, plus a copy on PDOK. On 16 October 2026 it held 97,768 groundwater monitoring wells.

This block is an example of what you can show with this source. Open the source itself to look further, pick other figures or use the data in your own work.

Open the table at TNO The API call behind this block All about this source

Access: Open
Licence: CC0 1.0 (volgens PDOK en de TNO-registraties op data.overheid.nl)
Table: gm_gmw (grondwatermonitoringputten)
Latest figure: 2025
Fetched: 25 October 2026

Fetch exactly these figures yourself

curl "https://api.pdok.nl/tno/bro-grondwatermonitoring-in-samenhang-karakteristieken/ogc/v1/collections/gm_gmw/items?f=json&limit=1000"

Groundwater monitoring wells in the BRO by year built: 2,786 wells in 2025, 2.2 times as much as in 1990

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