Water quality at Waikawa Estuary depends on the tides and whether it has rained recently. That means it is almost always safe for swimming when the tide floods into the estuary and is generally safe for swimming on an outgoing tide, except during and after a river fresh.
Rain washes bacteria and sediment off streets, roads, plants and land into water which increases health-risk and makes it look murky. It is best to wait for the water to clear before using it for swimming.
Water quality in the Waikawa Estuary is a result of what happens upstream. Horizons works to improve water quality by: