Government unveils sewage and waste water census after 2017 figures show hundreds of unauthorized discharges into the sea

Updated 3 January 2018: Last year the Government announced HERE that “the definitive census” would be available from end December 2017, and it is now HERE (if you can’t get the link to work, remove the “s” from the “https” in the url because it’s a problem with the gobcan site’s security certificate – not the site itself!).

Updated 13 September 2017: As I posted in the microalgae article last month, “the last census of discharges into the sea was in 2009, and that a new one is currently being finalized: it will be published in November.” This morning, however, the Canarian Government’s Minister for Territorial Policy, Sustainability and Security, Nieves Lady Barreto, presented to the regional Parliament a preview of the data obtained. Barreto said that the analysis of discharges throughout the Canaries shows 355 direct to the sea, of which only 109 (31%) have the required authorization. Of the 246 lacking permission, 71 are processing an appplication for authorization, and 12 have expired authorization. Tenerife has the greatest number of discharges of all the islands, 146, of which 89 (61%) do not have authorization, 19 of them being in the application process.

The figures will be embarrassing for the Government, which has been at pains to play down any problem in the light of publicity over microalgae blooms, and Barreto herself said that the problem of sewage and waste water discharges is not of a day or even a decade, but a perennial one in these islands. She asked for cooperation and commitment from all administrations at all levels to find definitive solutions to deal with unauthorized discharges, but her explanation of the various authorizations required for water purification and discharges directly into the sea showed the Byzantine complexity of responsibilities divided between Ayuntamientos, Cabildos and the Government itself – within which the responsibility is divided between the Department of the Environment, that of Agricultura, Pesca, Alimentación, as well as the Department of Política Territorial, Sostenibilidad y Seguridad, and finally that of Costas.

The system could not have been better designed if the specific intention had been to allow each authority in turn to put the blame onto another. This is an issue that is not going to go away, and one that has no easy solution. Previous censuses have been carried out in 2003 and 2009, but the timing of this third census coincides with discharges coming to the forefront of public awareness because of the blooms of microalgae around the whole of these islands, even though the connection between the two issues is much disputed. It does seem, though, that the game of pass the buck is not going to wash for much longer.

Updated 14 August: Since the confirmation a few days ago from scientists and the Canarian Government’s own subdelegado Guillermo Díaz Guerra, himself a chemist, that there was a link between untreated sewage and microalgae blooms, a sort of war has broken out. Some parts of the Canarian Government have disowned Diaz Guerra’s statements as wrong, furious that he expressed the view because of the damage it could do to Tenerife’s tourism industry.

Many might well think that much damage has already been done, but outright denials and condemnation have followed the minister’s comments. So concerned are the tourism authorities, indeed, that Promotor – the Canarian Government’s tourism promotion body – has issued the following statement. I post it for the sake of completeness, though as I’ve suggested before, in an age where “expert” opinion and political reassurances are viewed with extreme cynicism, such doubling down by the authorities could backfire and make people even more convinced of the opposite.


The presence of a microalgae bloom at a limited number of Canary Islands beaches is a rare event caused by a range of biological, environmental and climatological factors and is in no way connected to water pollution.

None of the beaches in the Canary Islands are closed due to the phenomenon and there have only been sporadic red flags on a few beaches. This is because even when the microalgae reaches a beach, driven by the wind, waves and currents, it tends to affect a small area of the shoreline and then only for a short period.

The only effect of the microalgae is skin irritation and the Canary Islands Health Authorities recommend that bathers avoid direct contact. The algae is easy to identify due to its characteristic colour and appearance. The Canary Islands Public Health System has not seen any change in the number of cases of reported skin irritation since the appearance of the microalgae.

98.2% of Canary Islands beaches are classed as having an excellent level of cleanliness by the Canary Islands Government Monitoring System for Beach Safety and Water Quality, which follows European regulations. Of the rest, 0.9% are rated as good and 0.9% are uncategorized. These figures are delivered annually by the Ministry of Health of the Kingdom of Spain to the European Commission’s European Environment Agency.

Despite this temporary situation, which only affects a small number of the beaches in the Canary Islands and then only prevents swimming in the limited areas directly affected, tourist activity goes on as normal in the Canary Islands. Our visitors are enjoying the swimming areas of the vast majority of beaches in tourist areas as they always have done.

Meanwhile … a Tenerife musician has composed a charming little song from the perspective of the microalgae itself …

Updated 11 August: In the face of overwhelming disgust on social media, unprecedented press interest and investigation, and pronouncements by senior scientists, the Canarian Government has had to cave in and admit a link between untreated sewage and the blooms of microalgae that have been seen around the islands’ coasts this summer. The link is that although the blooms are natural, being produced by warmer seas and calima-borne “nutrients” like iron, they are also nourished by untreated sewage further out to sea so as to produce a greater number of florations and in greater frequency.

This has been instinctively obvious to many for some time, but without a scientific background or access to independent professional analysis, most people are confined to expressing their feelings on social media. Now, however, following statements by Julio Muñiz Padilla, a retired Canarian environmental chemist that there is indeed a link between the blooms and untreated waste entering the sea, the Canarian Government has finally conceded “there is a link between sewage spills and the microalgae”. Reiterating what Muñiz Padilla had said – a standpoint that is clearly now irrefutable – the Canarian Government’s Guillermo Díaz Guerra, himself a chemist, has acknowledged that the spills are not the only cause of the microalgae around Canarian coasts, but that they are undoubtedly a linked and contributing factor.

And so, the microalgae itself is indeed intrinsically harmless, apart from the possibility of some minor skin irritations in some with a sensitivity, and the bacteria actually do a good job, like many fish, of breaking down untreated sewage without themselves becoming carriers of illnesses. None the less, the blooms are symptomatic of the underlying problem precisely because of the link that the authorities have until this moment tried to deny with increasingly doubled-down statements that beaches have not been closed because of algae, and that there have been no recorded instances of illnesses caused by the blooms. Now we know the truth, that the florations are visually symptomatic evidence of the sewage problem, and not just that, but that they are increasing in number and frequency because of it.

As the professor commented and Díaz Guerra has accepted, the issue of increasingly wild weather, stronger and more frequent heatwaves and calimas, and warmer oceans is settled science. There is no meaningful debate to be had any more as to whether it’s happening, but this is a planetary problem, and beyond the scope of national, or especially regional, authorities to cure. What the Canarian authorities can actually cure, however, is the problem of untreated sewage.

It is essential to stress that, despite all this, beaches here are safe, and independent scientific water analysis is carried out regularly and frequently. Beaches are indeed closed when a sewage problem arises, or E-coli or other harmful content is detected close to shore. And it is true that no beaches have been closed – nor needed to be closed – because of the microalgae itself. None the less, the effect on tourism from a perceived danger, and the negative impact of the horrendous images that have circulated of both sewage and blooms – indistinguishable in the minds of many – is potentially catastrophic. And this is why the Canarian Government must act. And fast.

Updated 9 August 2017: It’s nearly a year since I posted (below) about Podemos raising the question of whether Tenerife’s coastal waters are clean or not, and in that year things would seem to have gone from bad to worse. The Canarian Government’s Health Department has been adamant that the blooms of microalgae have nothing to do with any untreated waste going into the sea, and has also expressed in the strongest terms its rejection of British press claims that the algae has caused the closure of beaches.

Sanidad says, indeed, that not one beach has been closed because of the algae even though local authorities have had the power to close beaches should the blooms move too close into land. This is undeniably true, but it is a sophistic claim, because beaches have indeed been closed … just for different reasons. And those reasons are far less palatable than “microalgae” in terms of health, public relations, and in every other sense, because they involve E.Coli contamination that has seen beaches cordoned off the length of the east coast.

Such disingenuity on the part of the authorities does little to reassure a public increasingly cynical about “expert” or political assurances, and now at least one journalist is openly saying on social media that the problem of untreated sewage in Tenerife’s waters is close to destroying our habitat, our health and our tourism. Meanwhile, business leaders in south Tenerife are demanding action against sewage contamination, with the sector fearing a hit to tourism if beaches continue to be closed.

Some horrendous pictures have been made public showing uncontrolled sewage spewing into the sea, “spills” that are said to occur around the entire coast.  The effects are all too visible even without beaches being closed, and it is this word of mouth element that the business associations fear most of all, as tourists report their findings on the like of Trip Advisor. It is against this background that the microalgae has arrived, and to some extent, it is irrelevant whether or not, or how, it is connected to the spills because with or without it, spills there clearly are, and apparently causing significant public health problems including gastroenteritis and hepatitis A, conditions far worse than the “skin irritation” attributed to the blooms.

The Cabildo has said it is investing some €50m over three years to improve the sewage network, and business leaders have called for these works to be expedited. Some, though, are not prepared to wait, nor to listen to what they consider to be more platitudes. They are calling for action now on what are claimed to be some 500 points of flow pipes carrying untreated sewage into the seas around the Canaries. One has started a petition on calling for all waste pumped into the sea to be treated first. The petition will be delivered to the presidents of all the island Cabildos as well as the Canarian President himself, and has achieved over 15,000 signatures in just four days: it is HERE if you would like to add your own voice.

There has been much talk over recent months about the microalgae blooms but few are actually talking about the elephant in the room. It’s time to change this and acknowledge that the Canaries has a problem with sewage being pumped directly into the sea … and to demand that a solution is found.

Original post 14 September 2016: Are Tenerife’s coastal waters clean? Podemos says not, and insists that the problem that closed Troya beach recently was not an isolated incident, but part of a constant discharge from the south Tenerife sewage treatment plant. Podemos’ Cabildo councillor Julio Concepción says that initial enquiries into deficiencies in the Arona-Adeje water treatment plant and into this summer’s sewage spills have thrown up such worrying details that they are going to take the matter up in the next Comisión Insular de Sostenibilidad y Medio Ambiente. Among these findings is the suggestion that the spills are not occasional but constant, and that they are due “as much to problems with the functioning of the plant as to the treatment of the waste that is entering the sea”.

Concepción said that Podemos was obviously concerned for the public who use the beaches and swim in the sea, but also for the dolphins and pilot whales who swim in these waters, species that are protected and require a clean environment both for their own sake, and for the sake of the many economic benefits they bring to private and public companies because of the interest they generate among visitors.

And of course there is also the question of fish caught in these waters. We will all have seen the lights of the fishing boats not too far out to sea, and Concepción said that “we are facing a genuinely serious problem that is putting at risk the health of many people”, and which, he stressed, “ran the risk of sanctions being imposed by the EU for irresponsible sewage spillages that affect the whole coast”.

The councillor reiterated that “there is no water purification system worthy of the name between Las Américas and Santa Cruz, i.e. the whole of the south and south-east of the island, and practically none from Las Américas up to and including the municipality of Santiago del Teide”. He called on the Cabildo to make suitable investment in projects to make the water safe and free from pollution, and with reference to the Cabildo’s recent Hug a Brit campaign said that British visitors would prefer to know the water was fit for bathing. He has a point, surely?


  1. Hi Janet,
    Your site is fantastic, thank you.
    Realise that this is not a priority at the moment due to COVID-19 but do you think there has been an improvement in the amount of raw sewage being pumped into the sea? I read about a new wastewater plant being constructed in Güimar, was this ever completed?

    1. Author

      Yes, it halved, within a month. I don’t have the report to hand at the moment to give a link, sadly, but the figures were released and showed an insane improvement within hardly any time of the hotels closing. I don’t have any info about Güímar, I’m afraid.

  2. The amount of muck floating in the sea off of Playa Arena/Puerto Santiago has been disgusting. I have been violently ill as have guests of ours and several neighbours. I am also aware of others in the area.

    I can’t believe this isn’t a result of the sewage and it getting into the air, we are right by the shore.

    I have been to the (temporary) council office in the police station and reported the matter but the reception I received doesn’t fill me with any confidence that anything will be done. They were very dismissive!

  3. Apologies Snowbird4 – figures you said were correct 146 direct discharges.

  4. Dear Snowbird the recent figures reveal 355 untreated discharges into the sea whether they were authorised or not and I take that as untreated sewage. This is probably daily (or twice -each tide?). I think the report is having an effect. I have just witnessed 5 vehicles in Del Duque emptying the pumping station adjacent to the Acanto at midnight. I feel instead of pumping they are removing sewage waste by lorry to ??? Obviously this is good for del duque but for how long? When the imminent water tests (previously 22.09.17) are taken and show all clear will the pumping resume???? Hopefully not……

  5. These latest figures reveal that Tenerife had 146 discharges into the ocean of which 89 were unauthorised. What will be important to understand is the timescale over which such discharges were monitored and what kind of volumes of sewage are involved in a discharge.

    1. Author

      I would hope that that information comes in the report in Novemer. I agree it’s essential for context.

  6. Hi Ray what you have seen (I think) is the brown sand washout from the El Beril beach “improvement” works which occurs daily during week days. It usually drifts towards Fanabe in front of Del Duque but recently the currents has sent it a little the other way. This is bad enough causing more pollution and has lead to a (now resident) flock of seagulls in El Beril bay waiting like vultures for the dead sea life being washed up. The sewage/algae is usually on a smaller scale but will be an ever increasing issue due to the 2 or 3 huge hotel developments that will add to what is already pumped out – untreated? I would welcome any information on the new developments waste disposals – especially the one at La Caleta. Baobab was aptly named from the smell by the pumping station by Adeje Gran which also has a huge sister hotel almost completed and new build.

  7. We live high up in Roque del Conde and for the past few months have seen dirty coloured sea water close in shore between La Caleta and Puerto Colon from time to time. At first, we thought this was some sort of unacceptable discharge but through binoculars I have seen a JCB working on the many sea defence walls (if that is what they are) immediately behind the large hotel complex that is about 0.5km from La Caleta. I think this work is the cause of the water contamination we are witnessing.

  8. Early this morning we’ve walked from Playa Torviscas to beyond La Caleta and back to La Caleta for Sunday lunch at one of the fish restaurants. Very enjoyable but as we walked back we saw the brown sludge that this article is talking about. I can’t believe that this is happening. Also what was once a quiet village, now is becoming an extension of Las Americas with brand new hotels and beach cafes. If Tenerife can’t cope with the sewage situation now, what hope is there for the future!

  9. Over the last few weeks I have seen and photographed what appears to be floating brown soup patches in Puerto Santiago, La Caleta and Del Duque. Does anyone actually test to see what it is? Floating sewage or algae? In Puerto Santiago I snorkeled to look at it and that patch was actually floating and not mixing with the sea water below leading me to think the former. To refer to the sewage problem as “spills” is deceptive as the pumping of sewage into the seas is constant and deliberate rather than accidental. Apart from the brown soup debate even in the crystal clear water of Tejita beach I saw some floating fawn coloured debri being washed up. In Del Duque yesterday even more obvious floating bits of faeces were evident. Looking across La Caleta bay (Enramada) on full tide you can see where something is pumped into the bay. Last week I saw this at lunchtime then 3 hours later the “soup” could be seen which was not there earlier. Sooner or later the bad press will be overtaken by a UK TV investigative documentary (C4?) resulting with action? from the authorities -which will be too late and lead to falling tourism and property prices. Daily pumping of raw sewage into the sea needs to halt!

  10. And the beach at El Medano is closed yet again a few days ago due to E-Coli, and city hall is blaming an “illegal spill” of sewage…..time to admit there’s a problem or my 2 week trip to Medano in October will be my last. Seems like the authorities are happy for tourist money but doing nothing in return. Made many friends of locals there in the last few years and this is awful for them more than anyone. It;s like the storyline of “Jaws” but replace the shark with sh*t as the danger…. El Medano, paradise lost??

    1. Author

      It was part of the beach and it was reopened within 24 hours – as I posted HERE. Bear in mind the blue flags our beaches have (see HERE). There is regular ongoing analysis of beach water, so it is vital not to become confused as to the nature and frequency of the problem of occasional contamination. Most importantly, even if sewage spills do feed the algae, there is no connection whatsoever, not even the slightest suspicion in any quarter as to a connection, between the algae/bacteria and E.coli or Enterococcus, and when any contamination is detected, beaches are always closed until analysis shows the problem has passed.

  11. Not attending to the problem of raw sewage by the authorities , makes me think of Brexit and self inflicted damage to your economy.

  12. Just ask the divers off Los Gigantes what they think about it. I did, and the answers confirm that untreated, raw efluent is undoubtedly being pumped straight into the sea off Los Gigantes. I cannot believe that the authorities have the audacity to deny this. It is well past time to do something about it. I understand that local businessmen have previously offered to contribute to the cost of extending the outlet pipe, but their offer was rejected. I have personally approached the previous mayor on the subject and was practically thrown out of the room. I am genuinly concerned about the future for tourism in the area if those in charge do not get the situation under control and genuinely meet European standards.

  13. The issue is not if blooms are caused by untreated sewage or not, it’s the fact that raw sewage is being pumped into the sea. That is undisputed and I have seen plenty of ‘evidence’ floating around well within 1 mile of shore. It’s unacceptable and a serious health hazard. I would never swim in the sea here.

  14. Enough said about the algae bloom, nice move by the way, let´s go back to the main problem, the disposal of untreated sewage in Tenerife´s waters.
    If I understand correctly, we have to wait until after the high season to resume the discussion.

  15. It would be useful if the water purity checks were publicised more widely instead of having to go visit individual councils. I do wonder sometimes how accurate and random the checks are because after large downpours sewage can be seen overflowing from manholes and running directly onto beaches e.g. by back entrance to 5* Bahia del Duque and Chill out Bar Del Duque. I will provide photos next time. Ps What are the sewage disposal plans for the 2 New hotels in Costa Adeje Gran sister and the enormous Corales Suites Hotel la caleta?

  16. As a recent property purchacer how do I check the quality of water at our beach and lagoons in alcala

    1. Author

      Go to your council in Guía de Isora and ask for their water purity checks records in the Environment Department.

  17. All sewage should be processed through Primary settlement tanks and if necessary treated withFerric Oxide to enhance the process. Air lift Humus tanks will bring sludge up from the bottom of these tanks. I don’t know the full SP on the treatment of the final effluent but ammonia aerobic filtration wouldn’t go amiss.
    This process combined with circulatory biomass filters would bring the treated water to drinking standard ( not that I’ll ever test that theory). Increasing the outfall distance into the sea should also assist with cleaner beaches. Not cheap options but necessary if Tenerife wants to continue being the holiday resort of choice,

  18. Are the current water testing procedures not accurate? The “clean” environment for the protected species also needs greater supervision as the number of boats viewing the whales and dolphins has increased significantly recently.

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