The 41,968 pools in the province of Tarragona, municipality by municipality
This is the real order of the province, with nobody left out. It is led by El Vendrell with 2,807 registered pools, followed by Calafell with 2,802: five pools between first and second, in two neighbouring municipalities of the Baix Penedès. Third comes Mont-roig del Camp with 2,614, fourth L’Ametlla de Mar with 2,342 and fifth Cambrils with 1,837. Behind them come Tortosa with 1,718, Cunit with 1,582, the city of Tarragona itself with 1,533, Roda de Berà with 1,321 and El Catllar with 1,270. Closing the top of the table are Reus with 1,125, La Bisbal del Penedès with 1,013, Valls with 859, Roquetes with 842, Salou with 824, Deltebre with 795, Alcanar with 693 and L’Ampolla with 659.
Three readings come out of that table, and together they explain what this province is like. The first: the two big cities do not lead it. The city of Tarragona comes eighth, with 1,533 pools, and Reus eleventh, with 1,125: between them they do not reach 2,700, fewer than El Vendrell on its own. That is not a statistical oddity, it is town planning: these are compact cities of apartment blocks, and the pool appears where there is a plot.
The second: the Baix Penedès is the heart of the province. El Vendrell, Calafell, Cunit and La Bisbal del Penedès add up to 8,204 pools between the four of them, almost one in five in the province, along a very short stretch of coast. This is the second-home belt closest to the Barcelona area, with villa estates built in the seventies, eighties and nineties, and that has a practical consequence: most of those pools are old, with dimensions that appear in no catalogue, and the cover has to be worked out over a pool that is already built.
The third: the Terres de l’Ebre carry real weight. L’Ametlla de Mar, Tortosa, Roquetes, Alcanar, Deltebre and L’Ampolla add up to 7,049 pools between the six of them, and it is a market that bears no resemblance to the Penedès one: larger plots, houses in year-round use in Tortosa and Roquetes, and estates on the coast that are very exposed to sea air. Two different realities, and the same order sheet does not settle both.
A necessary warning about these figures. The Land Registry census under-records: it is a floor, not a ceiling. There are pools that have never been declared and others that appear late, so the real figure is higher than the published one. Nor does it tell a private pool from a communal one, or from a hotel’s or a campsite’s, and that matters here: in Salou (824) and in Cambrils (1,837) a good part of the census is hotel, holiday-apartment and campsite water, not villas with gardens. The 2,807 pools in El Vendrell are every registered body of water in the municipal area, not 2,807 houses with a pool. And the data does not go below municipality level: there is no official breakdown by district or by estate, so when we divide the province into comarques here we do it by geography, never by attributing figures to a neighbourhood.
That is where a slatted cover justifies itself with arguments that have nothing to do with looks. Closed, it cuts evaporation by 70% to 80%, which is where most of the water and most of the heat go, and chemical use falls by around 35%. With a heat pump and the cover in place the system uses 50% to 60% less, and with solar polycarbonate slats the water gains 6 or 7 °C during the day at no cost at all. The other reason is safety: closed, the slats form a continuous surface that prevents access to the water and holds 100 kg to the NF P90-308 standard, which is French and not European. That does not make it walk-on: it must not be walked on, and it is no substitute for adult supervision.

