Sewage treatment plants in Mallorca
Septic tank, treatment plant or holding tank, the documents and maintenance, in detail.
See the guide →Treatment plants · Marratxí
Sewage treatment plants in Marratxí, above the aquifer that supplies Palma
Between Pòrtol, Sa Cabaneta and Es Figueral there are estates and houses on rural land that treat their own waste water. And underneath is the aquifer that supplies part of the water for Palma and Marratxí, so here it matters what leaves each house. We are Joaquín and Juan, installers in Mallorca since 1998: we supply the new treatment plant, install it, do the electrics and prepare and sign the documents for your architect or 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
- Public supply wells checked
- Since 1998
Your area
Why in Marratxí we check where the wells are
Marratxí lies on the Pont d'Inca groundwater body (1814M3), which it shares with Palma, Santa Eugènia and Santa Maria del Camí.
An aquifer people drink from
According to Annex 9 of the Water Plan, part of the water from Pont d'Inca is used to supply Palma and Marratxí. Where there are public supply wells there are protection perimeters, and inside the maximum restriction perimeter the treatment plant needs disinfection and denitrification (art. 70.10, table 13); with 12 population equivalents or more, a prior authorisation too.
Nitrates and chlorides
The body is in poor status: 82 mg/l of nitrates, 325 mg/l of chlorides and 87 % abstraction. The Plan credits the improvement of recent years to the vulnerable-zone programmes and less farming. A septic tank that only settles does not help; a treatment plant meeting the performance of art. 70.10 does.
The ground
The aquifer is Miocene and Pliocene calcarenite, linked to coral reefs and coastal sands. What comes out when digging your builder will see; before that we give them in writing how the pit must be according to the manufacturer.
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 “Pont d'Inca (1814M3)” · EN 12566 · manufacturer's manual (GRAF one2clean, as an example).
The rules here
Growing houses and roof downpipes
If you extend the house and add bedrooms, the treatment plant is recalculated: in a home, the Plan's guideline equivalence is one population equivalent per bed space (art. 70.8, table 12), and we size it for the maximum. If you go above 12, the pre-treatment changes, adding grease removal, and so does the yearly report (art. 70.11).
Rainwater never goes into the treatment plant (art. 70.7.d): the roof downpipes go their own way.
What we do
What we do in Marratxí, and what others do
- The unit depends on the well perimeter: a new treatment plant, with CE marking and EN 12566, and if your house is inside the maximum-restriction perimeter, with disinfection and denitrification (table 13). We work with all brands; as an example, the GRAF one2clean.
- Installation, electrics and start-up in Pòrtol, Sa Cabaneta or Es Figueral, as a licensed low-voltage installation company, with the roof downpipes kept out of the plant (art. 70.7.d). We don't subcontract anyone.
- If you extend the house, we recalculate the unit for the maximum bed spaces. And the services: those 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.
- Authorisation or declaration: with 12 population equivalents or more next to a public supply well, a prior authorisation is needed. We prepare and sign the documents as the installation company; your architect or engineer files them.
- Calcarenite, or whatever the digging turns up: the pit is your builder's job, following what we give them in writing according to the manufacturer. The sludge is removed by an authorised waste company, as art. 70.7.f requires.
How we work
How we do it in Marratxí, in 3 steps
1
Any wells nearby?
With the location and bed spaces we look up on the DGRH map the protection perimeters of the Pont d'Inca aquifer, which supplies drinking water to Palma and Marratxí.
2
A quote based on what we find
In writing: a unit with or without disinfection and denitrification, the electrics and, for your builder, the pit size the manufacturer requires.
3
Installation and documents for your engineer
We install once the pit is prepared, commission the plant and hand over the signed documents; your architect or engineer files them with the DGRH.
Keep learning
More on treatment plants and energy in Marratxí
The general guide to treatment plants and what else we do in your area.
Solar panels in Marratxí
Self-consumption for the house, the treatment plant blower included.
See solar in Marratxí →Heat pumps in Marratxí
Heating and hot water with a heat pump.
See heat pumps in Marratxí →Across Mallorca
Sewage treatment plants by area (west and centre): Palma · Andratx · Calvià · Llucmajor · 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 →
Sewage treatment plants near Marratxí: Santa Eugènia · Bunyola
Also in Marratxí: air conditioning · water softeners · EV charger installation
See our work and customer reviews on the JSL Google Maps profile →
Common questions
Frequently asked questions about treatment plants in Marratxí
How do I know if my house in Marratxí is near a public supply well?
The protection perimeters of public supply wells are approved by the water authority and shown on the DGRH map. We check them with your house's location before quoting, because they change the unit. The Pont d'Inca aquifer under Marratxí partly supplies Palma and Marratxí, according to the Balearic Water Plan (Royal Decree 49/2023).
What changes if the house is inside a well perimeter?
Inside the maximum restriction perimeter of a public supply well, the treatment plant needs disinfection and denitrification after treatment (art. 70.10, table 13 of the Balearic Water Plan, Royal Decree 49/2023). And if the house has 12 population equivalents or more, a responsible declaration is not enough: a prior authorisation is needed.
Can I connect the roof downpipes to the treatment plant?
No. Art. 70.7.d of the Balearic Water Plan (Royal Decree 49/2023) forbids the treatment plant from collecting rainwater: rain dilutes it and washes out the bacteria. The downpipes go to their own network or to a cistern. If you need the house drainage redone, we do that under drainage.
I am extending the house. Will my current treatment plant do?
You need to check that the unit covers the new bed spaces: in a home, the guideline equivalence is one population equivalent per bed space (art. 70.8 and table 12 of the Balearic Water Plan, Royal Decree 49/2023), and we size the plant for the maximum number of people, not the average. If the extension takes you above 12, the pre-treatment includes grease removal and a report goes to the DGRH every year (art. 70.11).
What must the treatment plant manufacturer certify?
That the unit is approved, CE-marked and compliant with the EN 12566 family (art. 70.14 of the Balearic Water Plan, Royal Decree 49/2023), and that its performance reaches at least BOD₅ 70 %, COD 75 % and suspended solids 70 % (art. 70.10), according to its EN 12566-3 test. We work with all brands; as an example, the GRAF one2clean.
On site, who does what?
Your builder does the excavation, the sand bed and backfill, the trenches and the inspection chambers. We supply the unit, install it, do the electrics, commission it and prepare and sign the documents, which your architect or engineer files. Emptying the sludge is later done by an authorised waste company (art. 70.7.f of the Balearic Water Plan, Royal Decree 49/2023).
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 Marratxí with no mains sewer?
Send us the location, the bed spaces, whether there are wells nearby and a few photos. We reply within 24-48 hours on working days.