"The level has been rising gradually since 1890 by about 0.2 cm per year due to the melting of the ice and the warming up of the ocean," expert Fedor Baart, of the research organisation Deltares, said in a statement yesterday.
"That means that, as a rule, you expect the sea level to be higher every year."
Sea and water levels are carefully watched in the Netherlands, as much of the country lies below sea-level and is protected from flooding by a series of defences such as dykes, sand dunes, windmills to pump away water and sophisticated barrages.
The previous highest reading was in 2007 when the water was nine centimetres above the NAP.
The institute said in 2017 "there were several storm surges in a single year for the first time since 2007," which had contributed to the high water levels.
Bad storms can temporarily push water levels up by a meter, which accounts for an average rise of about one centimetre, Baart explained.
The institute also highlighted that every 18.6 years the seas rise and fall by two centimetres on a tidal cycle.
"The last peak was in 2004, and the level is now rising again to the next peak in early 2023," Deltares said in a statement.
Dutch water defences were completely overhauled and improved after devastating floods in 1953 which left 1,800 people dead.
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