NRW testing water quality at popular swimming spots
This is to ensure the safety of 112 designated bathing waters across Wales.
The testing, in line with the Bathing Water Regulations 2013, will continue until September 30.
The Welsh Government recently added Lisvane and Llanishen reservoirs in Cardiff to the list of designated sites.
Samples from these sites are sent to NRW's laboratory in Swansea, where they are tested for Escherichia coli (E. coli) and intestinal enterococci (IE).
These are key indicators of water quality and potential health risks.
Ceri Davies, interim chief executive officer for NRW, said: "More people than ever are discovering the joys and health benefits that open water swimming has to offer.
"We know how important Wales's bathing waters are to people and we remain firmly committed to ensuring our waters are clean, safe and protected for everyone to enjoy for generations to come."
Last year, 98 per cent of Wales's designated bathing waters met stringent environmental standards, with 75 out of 110 sites meeting the 'excellent' criteria.
NRW officers also carry out checks at bathing water sites to identify and address any obvious signs of pollution.
Ms Davies added: "The vast majority of Wales's coastal bathing waters continue to meet the top standards, which is great news for communities, tourism and the economy.
"Improving water quality for the long term remains firmly at the top of our agenda."
She said the teams work hard to tackle the sources of pollution.
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