Recent tests detected faecal matter in Lake Wānaka, raising concerns about water quality.

Population growth, tourism, and inadequate infrastructure contribute to contamination, with reports of tourists toileting in the lake. Over five years, LAWA’s water quality rating dropped from "excellent" to "good," with E. coli levels fluctuating. Authorities plan $18 million in wastewater upgrades, while groups promote riparian buffers and reduced chemical use.

Though the lake remains generally safe, E. coli poses health risks. Continued monitoring, infrastructure improvements, and responsible tourism are vital to preserving Lake Wānaka’s health and recreational value.

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