Sewage treatment plants in Mallorca
Septic tank, treatment plant or holding tank, the documents and maintenance, in detail.
See the guide →Treatment plants · Maria de la Salut
Sewage treatment plants in Maria de la Salut: well installed and well maintained
A treatment plant is not something you bury and forget: it works if it is maintained. In the country houses and fincas of Maria de la Salut that are off the mains we install the new unit and make clear what servicing it needs and who does what. We are Joaquín and Juan, installers in Mallorca since 1998: unit, installation, electrics and documents prepared and signed for your engineer.
Send us photos and details · Reply within 24-48 hours on working days · We assist you in English, Spanish and German
- New approved unit
- Signed documents
- Servicing as per manufacturer
- Since 1998
GRAF one2clean · Image: GRAF
Your village
The Maria de la Salut aquifer, according to the Water Plan
The village of Maria de la Salut lies above the Ariany groundwater body (1816M1), which it shares with Sineu, Ariany and Santa Margalida: 38 km² in the north of the Pla.
Nitrates above the limit
Annex 9 of the Water Plan gives the Ariany body 72 mg/l of nitrates on average, slightly more than in the previous cycle (69 mg/l), and expects to designate it a zone vulnerable to nitrate pollution from agriculture. The pressure comes from crops and livestock.
One treatment works for four villages
Sineu, Petra, Maria de la Salut and Ariany share a treatment works, and the Plan includes its refurbishment and improvement. Part of its water has been reused for irrigation since the first planning cycle, which has made it possible to abstract less from the aquifer.
On your finca, the same on a small scale
Treat the water and irrigate with it: art. 70.12 requires the treated water to be reused on the plot, with 25 m² of green area per population equivalent. The aquifer is calcarenite, a porous rock; your builder will see what turns up when digging, with our written instructions.
The rules here
Maintenance, which is where treatment plants fail
The Plan requires a maintenance plan to be declared (art. 70.4) and does not set how often it is serviced: the manufacturer's manual applies, and if a regulation required more, the stricter one. On the GRAF one2clean, for example, the manual asks for two services a year (section 5.2). We do it on what we install, with a signed report. Emptying the sludge is separate: an authorised waste company does it, at the manufacturer's interval, and the receipts are kept for five years (art. 70.7.f).
The blower is never switched off, not even when the house is closed up: without air, the biology that treats the water is lost. And the treatment plant takes no rainwater (art. 70.7.d) nor anything that is not household water: wipes, oils or products that kill the biology.
What we do
What we do in Maria de la Salut, and what others do
- Servicing from day one: the services required by the rules or, if the manufacturer asks for more, the manufacturer's (on the GRAF one2clean, twice a year), with a signed report. That is the maintenance plan that gets declared (art. 70.4).
- The new treatment plant, approved with CE marking and EN 12566 (art. 70.14), chosen according to whether the country house is a main home or a seasonal one. We work with all brands; for example, the GRAF one2clean.
- Installation, electrics and commissioning, as a licensed low-voltage installation company: the blower aerates 24 hours a day and is never switched off, not even when the house is closed. We don't subcontract anyone.
- The sludge is emptied by an authorised waste company that you hire, checked in the Govern's public register, keeping the receipts for five years (art. 70.7.f). The excavation, your builder, with our written instructions according to the manufacturer.
- The documents for the responsible declaration to Recursos Hídrics, maintenance plan included, prepared and signed as the installation company; your architect or engineer submits them.
Sources: Balearic Water Plan, Royal Decree 49/2023 (regulations, art. 70, 71, 76 and 77) · Annex 9 of the Plan, entries for the groundwater body “Ariany (1816M1)” · EN 12566 · manufacturer's manual (GRAF one2clean, as an example).
How we work
How we do it in Maria de la Salut, in 3 steps
1
How the house is used
Send us the location, the bed spaces and whether you live there all year or seasonally: in a country house in Maria de la Salut that changes the unit. And a few photos of the spot.
2
A quote with the maintenance in writing
We send you in writing the unit, installation, electrics and documents, which services it needs and who empties the sludge. Your builder gets how to prepare the pit.
3
Installation and start-up
We install, start the plant and explain what not to put down the drain. We hand over the signed documents, maintenance plan included, for your engineer.
Common questions
Frequently asked questions about treatment plants in Maria de la Salut
What maintenance does a treatment plant need in a country house?
The Plan requires a maintenance plan (art. 70.4) and leaves the interval to the manufacturer; if a regulation required more, the stricter one applies. On the GRAF one2clean, for example, the manual asks for two services a year (section 5.2). In addition, the sludge is emptied by an authorised waste company, at the manufacturer's interval, keeping the receipts for five years (art. 70.7.f of the Balearic Water Plan, Royal Decree 49/2023). In Maria de la Salut we service what we install, with a signed report.
The house is closed up for weeks at a time: what do I do with the treatment plant?
Leave it switched on. The blower aerates 24 hours a day and without that air the biology that treats the water is lost. For seasonal houses there are units that feed the biology while nobody is there (on the GRAF one2clean, the Pack +C). If the use is so occasional that treatment is not feasible, the Balearic Water Plan accepts a sealed holding tank (art. 70.2.b).
Do I have to add bacteria or any product?
As a routine, no. Continuous aeration, 24 hours a day, keeps the biology going. Only at start-up, after a complete emptying or if it has been damaged by a lot of bleach, antibiotics or a long power cut. What does help in a house in Mallorca is not putting wipes, oils or paint residues down the drain: the treatment plant treats household water, not waste.
Who empties the sludge, and how often?
An authorised waste company, which you hire; you can check that it is authorised in the Govern's public register of waste managers. The interval is set by the manufacturer of the unit (art. 70.7.f of the Balearic Water Plan, Royal Decree 49/2023) and the receipts are kept for five years. The tankers may not discharge into the sewers, only at a public treatment works and with authorisation (art. 71.4).
Why isn't a septic tank enough in Maria de la Salut?
Because a septic tank only separates the solids. The aquifer under Maria de la Salut already has 72 mg/l of nitrates according to Annex 9 of the Balearic Water Plan, and the rules require a minimum performance of BOD₅ 70 %, COD 75 % and suspended solids 70 % (art. 70.10), with a unit approved to EN 12566 (art. 70.14).
Keep learning
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Quality
We work with all brands
As an example, GRAF tanks. We propose the unit for each house and what the area requires.
A country house in Maria de la Salut with no mains sewer?
Send us the location, the bed spaces, whether it is seasonal and a few photos of the spot. We reply within 24-48 hours on working days.