Sewage treatment plants in Mallorca
Septic tank, treatment plant or holding tank, the documents and maintenance, in detail.
See the guide →Treatment plants · Calvià
Sewage treatment plants in Calvià, inland and away from the mains
Calvià is known for its coast, but inland there is another Calvià: Es Capdellà, the village of Calvià and the estates of the Galatzó valley, on rural land, where some houses treat their own waste water. We are Joaquín and Juan, installers in Mallorca since 1998: we supply the new treatment plant, with its installation, its electrics and the documents prepared and signed for your architect or engineer to file.
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- New approved unit
- Signed documents
- Licensed low-voltage electrics
- Since 1998
Your area
Calvià's water, according to the Water Plan
Two entries in Annex 9 of the Water Plan explain why in Calvià it matters how the water leaves each house.
The Santa Ponça–Galatzó stream
The Santa Ponça–Galatzó surface water body drains a 71 km² catchment that runs largely through farmed rural land and includes Es Capdellà and Calvià. The Plan lists it in poor status, with phosphates and nitrates, and its general measures include reducing the pollution load on rural land. A treatment plant that meets the performance of art. 70.10 goes exactly in that direction.
Under the housing estates
The Palmanova groundwater body (1813M2), almost entirely in Calvià, is Jurassic limestone and dolomite and has 824 mg/l of chlorides. The Plan asks for less abstraction and no pumping deeper than 1 m below sea level. For your works: you may hit rock when digging the pit, and treated water is best used irrigating the plot.
Not into the stream
Treated water is not discharged into a stream. The rule is to reuse it on your plot, with 25 m² of green area per population equivalent (art. 70.12), and any other destination needs its own discharge authorisation (art. 70.1).
Sources: Balearic Water Plan, Royal Decree 49/2023 (regulations, art. 70, 71, 76 and 77) · Annex 9 of the Plan, entries for the surface water body “Santa Ponça–Galatzó” and the groundwater body “Palmanova (1813M2)” · EN 12566 · manufacturer's manual (GRAF one2clean, as an example).
The rules here
Declaration or authorisation: how it is decided in Calvià
A responsible declaration to the Directorate-General for Water Resources is enough when the treated water stays in your green area. A prior authorisation is needed if it goes to a trench or soakaway, whatever the size, or with 12 population equivalents or more inside a well restriction perimeter or 500 m or less from a wetland (arts. 70, 76.5 and 77 of the Water Plan).
As the installation company we prepare and sign the documents your architect or engineer asks for —the declaration that the installation complies with the rules, the manufacturer's performance, the maintenance plan and the electrical certificate— and they file them.
What we do
What we do in Calvià, and what others do
- The documents depend on where the water goes: a responsible declaration if it irrigates your green area, a prior authorisation if it goes to a trench or soakaway. We prepare and sign them as the installation company, with the electrical certificate, and your architect or engineer files them.
- A new extended-aeration treatment plant instead of the old septic tank, with CE marking, EN 12566 and the art. 70.10 performance certified by the manufacturer. We work with all brands; one example, the GRAF one2clean.
- Power line and a sealed outdoor sub-panel next to the blower, installation and commissioning, in Es Capdellà or the Galatzó valley, as a licensed low-voltage installation company. We don't subcontract anyone.
- Excavation and sludge, each on its own: your builder digs the pit, allowing for rock, following what we give them in writing from the manufacturer; the emptying, an authorised waste company (art. 70.7.f).
- Maintenance: 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, so the water irrigating your plot, not the stream, keeps meeting the standard.
How we work
How we do it in Calvià, in 3 steps
1
Location and surroundings
Tell us where the estate is, the bed spaces and what lies nearby: a stream, wells or a wetland. With that we check on the DGRH map whether a declaration is enough or an authorisation is needed.
2
The quote, in writing
Unit, outdoor sub-panel, a green area of 25 m² per population equivalent and, for your builder, the pit size according to the manufacturer, in case rock appears.
3
We install and sign
With the pit ready we fit the plant, start it and give your engineer the signed documents and the electrical certificate to file.
Keep learning
More on treatment plants and energy in Calvià
The general guide to treatment plants and what else we do in your area.
Solar panels in Calvià
Self-consumption for the house, the treatment plant blower included.
See solar in Calvià →Heat pumps in Calvià
Heating and hot water with a heat pump.
See heat pumps in Calvià →Across Mallorca
Sewage treatment plants by area (west and centre): Palma · Andratx · Llucmajor · Marratxí · Santa Maria del Camí · Binissalem, or see the guide to sewage treatment plants in Mallorca →
Need the house drainage (downpipes, rainwater, chambers)? Drainage in Mallorca →
Also in Calvià: air conditioning · EV charger installation
See our work and customer reviews on the JSL Google Maps profile →
Common questions
Frequently asked questions about treatment plants in Calvià
Are there homes in Calvià that need a treatment plant?
Yes: any house with no access to the mains sewer needs an on-site treatment system, a holding tank or a natural system with a favourable report (art. 70.1 of the Balearic Water Plan, Royal Decree 49/2023). In Calvià this happens mostly inland, in Es Capdellà and on the rural estates of the Galatzó valley.
Can I discharge the treated water into the stream on my estate?
As a rule, no. The Water Plan requires it to be reused on the plot with 25 m² of green area per population equivalent (art. 70.12 of the Balearic Water Plan, Royal Decree 49/2023), and any other destination needs a discharge authorisation (art. 70.1). The Santa Ponça–Galatzó stream is also in poor status from phosphates and nitrates, according to Annex 9 of the Plan.
When is a responsible declaration not enough?
When the treated water goes to a trench or soakaway, whatever the size, and when the house has 12 population equivalents or more and lies inside a well restriction perimeter or 500 m or less from a wetland. Then a prior authorisation from the Balearic water authority is needed, and silence means refusal.
Does the treatment plant need electricity?
Yes: the blower pumps air 24 hours a day so the bacteria can treat the water. As a licensed low-voltage installation company we run the line and a sealed outdoor sub-board next to the blower cabinet on your Calvià estate, so nobody has to go into the house to reset anything, and we hand over the electrical installation certificate.
How often does the treatment plant need servicing?
The services required by the rules or, if the manufacturer asks for more, the manufacturer's: on the GRAF one2clean, for example, twice a year. We do them 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 you keep the receipts for five years (art. 70.7.f of the Balearic Water Plan, Royal Decree 49/2023).
Will the old septic tank of the house do?
A septic tank only settles: the solids stay and the water leaves almost as dirty. The Balearic Water Plan requires a minimum performance of BOD₅ 70 %, COD 75 % and suspended solids 70 % (art. 70.10), certified by the manufacturer to EN 12566-3. That is why what we install is a new extended-aeration treatment plant.
Quality
We work with all brands
As an example, GRAF tanks. We propose the unit for each house and what the area requires.
A house in Calvià with no mains sewer?
Send us the location, the bed spaces, what is nearby and a few photos. We reply within 24-48 hours on working days.