Treatment plants · Porreres

Sewage treatment plants in Porreres, for fincas, wineries and country houses

Porreres' municipality covers almost 87 km² and has 763 residents in country houses (INE, Nomenclátor 2025), as well as weekend fincas, agritourism properties and wineries that the mains sewer does not reach. 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 to file.

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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
Seasonal homes
Since 1998

GRAF one2clean treatment plant buried in the ground, cutaway view. Image from the manufacturer GRAF, not a JSL job

GRAF one2clean · Image: GRAF

Documents for Recursos Hídrics, prepared and signed Approved tanks with CE marking Service visits as the manufacturer requires, signed report We assist you in English, Spanish and German

Your area

Porreres' water, in the Water Plan and in the nitrates decree

Two official texts deal with what lies under Porreres: the Balearic decree on nitrate-vulnerable zones and Annex 9 of the Water Plan.

42.1 km² of vulnerable zone

The Balearic Government's Decree 18/2023 declares 42.1 km² of the municipality of Porreres, almost half, a zone vulnerable to nitrates of agricultural origin, and designates the Porreres groundwater body (1815M1), of 50.6 km². It is farmland, and fertilising is regulated.

The Montuïri body, shared

Part of the municipality lies over the Montuïri body (1815M2), which Porreres shares with Montuïri, Algaida and Sant Joan. The Plan measures 330 mg/l of chlorides and 220 of sulphates in it from natural causes, linked to the Miocene marls.

What a properly treated house does

A treatment plant with the performance the rules require, and the water reused on the plot's green area, adds no load to the aquifer and saves on irrigation. On a finca in Porreres with fruit trees or a garden, it is water you already have.

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 “Montuïri (1815M2)” · EN 12566 · manufacturer's manual (GRAF one2clean, as an example).

The rules here

Seasonal homes, agritourism and wineries

A house that spends weeks closed needs a treatment plant that copes with no inflow: the blower keeps running and there are units that feed carbon for those periods (on the GRAF one2clean, for example, the Pack +C). If use is so seasonal that treatment is not feasible, the Plan accepts a sealed holding tank (art. 70.2.b of the Water Plan, Royal Decree 49/2023).

In agritourism one population equivalent is counted per bed space and, in restaurants and function rooms, a quarter per seat (table 12). In hospitality the grease separator is compulsory (art. 70.7.e). A winery's process water is not domestic waste water: it is studied separately with your architect or engineer.

What we do

What we do in Porreres, and what others do

A unit that copes with an empty house between weekends: approved with CE marking and EN 12566 (art. 70.14) and, where needed, with carbon dosing (on the GRAF one2clean, for example, the Pack +C). We work with all brands.
Services for a seasonal finca: 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 and the blower always powered.
Installation, grease separator and electrics: an agritourism property with a restaurant gets the separator required by art. 70.7.e; we connect the blower as an authorised low-voltage installation company and leave it running. We don't subcontract anyone.
The documents for the house or the agritourism property, prepared and signed as the installation company for the responsible declaration to the DGRH (art. 70.4). Your architect or engineer files them; a winery's process water is studied separately with them.
The pit and the sludge: your builder digs following what we give them in writing according to the manufacturer, and an authorised waste company empties the sludge and leaves a receipt (art. 70.7.f). Treated water goes to the finca's garden area (art. 70.12).

How we work

How we do it in Porreres, in 3 steps

How the finca is used

Tell us whether it is a weekend house, a home or agritourism, the bed spaces, the location and where the water will go. We check whether it falls in the 42.1 km² of vulnerable zone.

Treatment plant or sealed tank

If treatment is feasible, a treatment plant; if use is so occasional that it is not, a sealed tank (art. 70.2.b). You get the quote in writing, and your builder, how to dig the pit.

Installation and signed documents

We install once the pit is ready, leave the blower running and hand you the signed documents for your engineer to file with the DGRH.

Keep learning

Frequently asked questions about treatment plants in Porreres

My Porreres house is a weekend home: treatment plant or sealed holding tank?

If treatment is feasible, a treatment plant, with the blower left running: without air the bacteria die. There are units that feed carbon while nobody is there (on the GRAF one2clean, for example, the Pack +C). If use is so occasional that it is not feasible, the Balearic Water Plan accepts a sealed holding tank (art. 70.2.b), emptied completely each time.

Is my finca in Porreres in a nitrate-vulnerable zone?

Almost half the municipality is: 42.1 km² according to the Balearic Government's Decree 18/2023 (BOIB no. 39 of 28-3-2023), over the Porreres groundwater body (1815M1). That declaration regulates fertilising. For the treatment plant what counts is the vulnerability of the aquifer on your plot: if it is high, denitrification and disinfection are needed (art. 70.10 of the Balearic Water Plan). We check it on the DGRH map.

I have an agritourism property with a restaurant in Porreres: how is the treatment plant calculated?

With table 12 of the Balearic Water Plan (Royal Decree 49/2023): one population equivalent per bed space, one per member of staff living on the finca, a quarter for each one who does not, and a quarter per restaurant seat. In hospitality the grease separator is compulsory (art. 70.7.e), and above 12 population equivalents there is a yearly submission to the DGRH (art. 70.11).

Can I use the treated water to irrigate the fruit trees?

The rules ask for it to be reused on your plot, on a green area, with 25 m² per population equivalent (art. 70.12 of the Balearic Water Plan, Royal Decree 49/2023). In Porreres, a land of fruit trees and vines, how that irrigation is distributed and over which planting we define with the manufacturer of the unit and with your architect or engineer.

Will a domestic treatment plant do for a winery's waste water?

Not as it stands. A winery's wash water is not domestic waste water: it carries a different load and falls under a different regime, and art. 70 of the Balearic Water Plan is designed for water comparable to domestic. For the toilets and the dwelling on the finca, yes. The process side is studied with your architect or engineer and with the water authority.

Who files the treatment plant documents in Porreres?

Your architect or engineer. As the installation company we prepare and sign the documentation: the declaration that the installation complies with the rules, the manufacturer's performance, the maintenance plan and the electrical certificate. With it the responsible declaration is filed with the Balearic Directorate-General for Water Resources (art. 70.4 of the Balearic Water Plan).

Quality

We work with all brands

As an example, GRAF tanks. We propose the unit for each house and what the area requires.

A finca in Porreres with no mains sewer?

Send us the location, the bed spaces, whether it is a seasonal home and a few photos of the spot. We reply within 24-48 hours on working days.

WhatsApp Joaquín Call Joaquín · 609 09 89 02