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Bay water quality/safety for swimming

by ZihuaRob ⌂ @, Zihuatanejo, México, Wednesday, October 31, 2018, 18:06 (13 days ago) @ norcal

I’m looking for recent, preferably quantitative information about water pollution in ZIhuatanejo Bay. We will be travelling to Zihuatanejo in January regardless of what I learn about this topic, however, we might decide to make reservations somewhere with a big pool and avoid swimming in the ocean.

I’ve looked at the “playas” data on the SEMARNAT website and the numbers don’t look bad, but the most recent data is from March 2018. After reading on this site about sewage discharge into the Bay during Tropical Storm Vicente earlier in October I started wondering how much the Bay actually cleans itself out with regular tidal action.

Does anyone know of any other resources that monitor water quality and pollution in the Bay? If there isn’t any actual testing going on, I suppose I’m still interested in hearing “opinions” about water quality and safety for swimming.

As CD69 commented, there is no reliable testing done of our bay waters. Unless incoming administration changes the protocol, a new report on our bay's alleged enterococcal measurements should come out around the second or third week of December just before the Christmas/New Year vacation period. Because the testing is so infrequent I do not consider it reliable. And because the bay isn't tested for anything other than enterococcal bacteria I also don't consider the testing very helpful.

That said, because I've lived by this body of water for around 30 years, I trust my senses. I know what it smells like, what it looks like and what it sounds like. While there are parts of the bay with problems, including the bottom of the bay which is no longer visible when crossing it by boat. However, with the measures that have been taken over the years at the insistence of good and responsible citizens, I wouldn't hesitate to swim today at Playa La Ropa, Playa La Madera and Playa Las Gatas. And some days Playa Principal should be fine for swimming, too. The pluvial water from the canal has mostly stopped flowing. There is no muddy smell anywhere I've been recently except in the areas with mangroves, as it should be. Only "Las Salinas" lagoon continues having "treated" wastewater discharged into it, though they are trying to use the "brown water" for irrigation purposes, so since the rains have apparently stopped more "brown water" should be diverted to this purpose instead of being discharged into the bay. As far as I'm aware the relatively recent problem at La Ropa's estero was resolved, and the rains opened it up anyway, as they've also done at La Barra de Potosí.

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