The official sample and our calculation always stand side by side, never one on top of the other. The sample is legally binding and can be three weeks old. The calculation estimates whether anything speaks against today, and it is documented here in full so anyone can check it.
Load = distance to the source x weight of the source x current conditions, then the history factor of the zone.
Distance, straight line
| unter 250 m | 1,00 |
|---|---|
| unter 500 m | 0,75 |
| unter 1 km | 0,45 |
| unter 2 km | 0,20 |
| unter 3 km | 0,08 |
| darüber | 0 |
Weight of the source, all from official fields
| nicht genehmigt | x 1,30 |
|---|---|
| in Bearbeitung | x 1,15 |
| Funcionamiento: No activo | 0 |
| ohne oder unbekannte Behandlung | x 1,35 |
| nur Desbaste oder Tamizado | x 1,20 |
| Sekundärstufe | x 0,80 |
| mit Desinfektion | x 0,55 |
| Leitungszustand Malo | x 1,20 |
| häusliches Abwasser | x 1,15 |
| Salzsole oder Entsalzung | x 0,45 |
| habituelle Einleitung | x 1,10 |
Conditions
f = 0.10 + 0.60 x rain + 0.30 x drift. Rain is the sum of the past 48 hours divided by 20 millimetres and capped at 1. Drift is the positive part of the cosine between the current direction and the bearing from the discharge to the beach, scaled with the speed. Several effective sources raise the result by 5 percent each.
Thresholds: from 0.55 red, from 0.22 yellow, below that green.
The history factor
Distance, permit status and weather do not know whether a discharge has ever reached this beach. The official samples do. The model calculation therefore passes through a factor taken from the zone own series, calculated as shares of the respective limit so that E. coli and enterococci are comparable. Damping only happens with evidence: below 20 samples the factor stays 1. A history of bans beats any damping.
| Own series of the zone | Factor |
|---|---|
| 5 oder mehr Badeverbote im Archiv | 1,40 |
| mindestens ein Verbot oder eine Überschreitung | 1,20 |
| unauffällig, p90 über 35 Prozent des Grenzwerts | 1,00 |
| p90 unter 35 Prozent | 0,90 |
| p90 unter 15 Prozent | 0,75 |
| p90 unter 5 Prozent | 0,55 |
| weniger als 20 Proben | 1,00 |
Limits
Legal limit in coastal water under RD 1341/2007, sufficient class: 500 cfu per 100 ml for E. coli, 185 cfu per 100 ml for intestinal enterococci.
This page does not replace official bathing water monitoring or a warning issued by the municipality. The estimated part is our own calculation, not a measurement.
Sources: Gobierno de Canarias (Dirección General de Salud Pública; Censo de vertidos desde tierra al mar), Ministerio de Sanidad (NÁYADE), European Environment Agency (UWWTD), Ministerio para la Transición Ecológica, Open-Meteo. Data as of: 2026-09-13, 22:18