THE WAYPOINT SUR
I hope you used your Brita this morning
The headline is national. The risk sits at your tap.
Greenpeace published an updated map of nitrate levels in Spanish drinking water in late April. More than 3,000 municipalities exceed their precautionary threshold. Spain's legal limit is 50 mg/L; most Costa tap water meets it. Greenpeace's recommended limit is 6 mg/L; most Costa tap water exceeds it. The headline scrolled past most readers as another national-scale alarm.
The actual story isn't national. It is at the postcode level, and the variation is wider than most expect. Costa towns within 30 kilometres of each other vary six times in their nitrate readings. Knowing your number and knowing where to look is the entire job.
What the data actually says on the Costa
The Greenpeace map and the underlying SINAC database (the Spanish Ministry of Health's Sistema de Información Nacional de Aguas de Consumo — National Drinking Water Information System) show wide variation across the municipalities of the Costa del Sol.
A few specifics from the most recent readings:
Marbella: above the precautionary 6 mg/L line but well below the legal 50 mg/L limit. Certified APTA (safe to drink) by the Spanish Ministry of Health. Acosol, the water operator serving Marbella, Estepona, and Mijas, conducts regular testing.
Algarrobo (Axarquía): 31 mg/L. Red zone on Greenpeace's map. Within legal limits but in the upper third.
Alhaurín el Grande: 34 mg/L. Same band.
Benamargosa: 42 mg/L. 84% of the legal limit. Any agricultural runoff event pushes the next reading over.
Around ten Costa towns sit in the elevated tier. Most coastal municipalities served by Acosol read in the safe range. The Axarquía and inland-Málaga municipalities are where the readings climb.
The two thresholds, briefly
Two numbers worth holding in your head.
50 mg/L is the legal limit in the EU Drinking Water Directive. Any reading above this triggers an obligation on the ayuntamiento — town hall to act. The EU Court of Justice already ruled against Spain in 2024 for non-compliance with the Nitrates Directive.
6 mg/L is the precautionary threshold Greenpeace and several public-health researchers now recommend. It is not a legal limit. It is the level at which long-tail health concerns (links to colorectal cancer and to risks for infants and pregnant women) start to register in the literature.
Most Costa tap water reads above 6 and well below 50. Whether that bothers you is a personal judgement. The decision is yours; the data should not be a guess.
The 60-second check
Two ways to look up your municipality:
SINAC's citizen portal at sinac.sanidad.gob.es. Spanish-language, slightly bureaucratic interface. Search by your municipality and pull the supply-zone report. The nitrate reading is in the parameter list.
aguacostadelsol.es is the cleaner option. A reader-friendly aggregator covering 14 Costa del Sol municipalities, with the SINAC data translated into a plain colour-coded read. Bookmark it. Two clicks and you have your answer.
If your reading is below 6 mg/L: nothing to do. If between 6 and 50: judgement call (filter, bottled, or stay on tap). If above 50 (rare on the coast, more common inland): your ayuntamiento has a legal obligation, and you have a queja formal — formal complaint route to push them. Confirmed May 2026.
What to do if your reading worries you
Reverse-osmosis filters remove nitrates effectively and run from €200 to €600 installed for a basic under-sink unit. Carbon filters and ion-exchange systems do not reliably remove nitrates. Bottled water is the lazy option and the most expensive over the year.
If you rent, the comunidad — homeowners' association sometimes has a building-level filter installed; worth asking. If you own a municipal-data check before the next ayuntamiento election is worth ten minutes.
Spanish-lite
Two phrases for your ayuntamiento visit if the reading is high:
¿Cuál es el último análisis de nitratos para mi zona de abastecimiento? — What is the most recent nitrate analysis for my water supply zone? Forces them to give you the SINAC number, not a generic reassurance.
Quisiera presentar una queja formal sobre la calidad del agua. — I would like to file a formal complaint about water quality. The queja formal triggers a documented response, which is what compels action on a low-priority municipal issue.
The bottom line
Greenpeace's national map is a useful prompt, not an answer. The Costa varies six times across 30 kilometres. The data is public and free, and reading it takes a minute. Marbella drinks fine. Benamargosa lives close to the line. Most readers will sit somewhere in between, and most will choose to do nothing once they see their number. That is a reasonable outcome. Choosing nothing without checking is not.
Enjoy the weekend — A. and the WaypointSur team, with the SINAC portal bookmarked and fresh filters in our Britas.
