Sewage on beaches in New Zealand. Ecological disaster threatens nature

Closed, foul-smelling beaches and homes sprayed with fecal matter – in Wellington, the capital of New Zealand, an environmental drama is unfolding after nearly 1 billion liters of sewage were discharged into coastal marine waters. Experts warn of risks to public health and disastrous consequences for a marine nature reserve.

Outdated infrastructure to blame

The crisis began on February 4 this year, when heavy rainfall flooded the Moa Point wastewater treatment plant in the New Zealand capital, leading to a widespread power failure. Water backed up into the outflow pipe and inundated the facility with untreated sewage to a height of several meters. Wastewater was immediately pumped into the sea – for two days it was discharged just 5 meters from the shoreline.

Currently, sewage is being pumped into the Cook Strait 1.8 km offshore. It undergoes only preliminary filtration intended to capture the largest waste items, such as sanitary pads and wet wipes. Each day, another 70 million liters of pollution flow into the ocean, bringing the total to around 1 billion liters.

This is not the first such incident in Wellington. Outdated infrastructure has previously caused flooding with stormwater and sewage. However, the scale of the February disaster surpasses all similar events in New Zealand’s history. As reported by Pat Dougherty of Wellington Water, the municipal water and wastewater company, repairing the damage at the Moa Point plant may take months.

Sewage in the water, on land, in the air

According to data published regularly by Wellington Water, dangerously high concentrations of fecal bacteria Enterococcus are still being recorded along many sections of the coastline. On Tuesday, February 17, measurements at Seatoun Beach showed levels exceeding the standard by more than twenty times.

Warning signs have appeared on Wellington’s beaches advising against entering the water, fishing, and collecting seafood. The ban on recreation by the water alone is generating huge losses for local businesses that depend on summer tourism.

Unfavorable weather in recent days, with strong winds, has caused pollutants accumulated on the beaches to spread further. Residents of Wellington’s southern coast, who once enjoyed living by the ocean, are now battling fecal matter that the sea breeze deposits on the facades of their homes. On Monday morning, waves reached a height of 7 meters, and sea foam swept across Houghton Bay, Princess Bay, Lyall Bay, probably also Island Bay, and most likely pollution was carried along its entire length, commented one local resident.

Not only people are suffering

The true scale of the tragedy in Wellington will only become clear in a few months. Water contaminated with waste continuously flows into the Taputeranga Marine Reserve, home to penguins, dolphins, octopuses, mussels, and many fish species. Christopher Cornwall, a marine biologist from Victoria University, warns that the sewage could lead to the mass die-off of algae, disrupting the biological balance of the entire ecosystem. Why are we pumping sewage into a kelp forest? This is clearly unacceptable and we should never have found ourselves in such a situation, he adds with indignation.

The Taputeranga Reserve includes a giant kelp forest several hundred meters long, shallow-water seaweed meadows, and sponge gardens on deeper reefs. These unique habitats are ecologically, economically, and culturally important, providing a source of livelihood for local iwi tribes.

Researchers from Victoria University of Wellington published detailed commentary on the disaster on the Conversation portal, emphasizing that large sewage discharges are usually presented as short-term public health threats. However, global observations show that intensive nutrient enrichment of marine waters and increased sedimentation can cause long-term ecological changes, especially when combined with heatwaves and marine storms.