Storm season leaves Costa Mar beaches heavy with plastic and silt

The beach at Punta Blanca, south of Puerto Azul, was ankle-deep in black sand and plastic shards when the municipal crew arrived on Tuesday morning. Raul Cordero, who has managed the Punta Blanca cleanup station for seven years, stood at the tide line with a clipboard and a frown. The August rains had been heavier than forecast, and the runoff from the interior had carried everything downstream — bottle caps, fishing line, foam from the construction sites inland, and a visible brown stain in the water that stretched fifty metres offshore.

This is the season when Costa Mar's hydro-dependent economy and its conservation mandate collide in visible form. The dams that power the region's electricity grid release water during the rainy months to prevent overflow. That water carries nutrient load from agricultural runoff and sediment from the interior valleys. The cleanup tallies from the past three weeks tell the story: Punta Blanca has collected 4.2 tonnes of plastic and mixed debris. Playa Verde, north of the capital, has logged 3.8 tonnes. Mangrove-zone stations have recorded phosphorus and nitrogen concentrations at 1.4 times the seasonal average, according to the Costa Mar Reef Monitoring Network's latest bulletin.

The reef itself is showing the strain. Corals in the nearshore zone have begun to bleach in isolated patches — not yet a crisis, but a warning that the nutrient surge is feeding algae blooms that shade the symbiotic zooxanthellae the corals depend on. The monitoring network has flagged the trend as significant but not yet catastrophic. What happens next depends on whether the dry season arrives on schedule and whether federal funding for nutrient-recovery systems keeps pace with the cleanup demand.