The catchment type surrounding Waikato estuaries is a mix of pastoral, exotic forestry, natural and urban (low in the Waikato Region 0 - 5%). Four estuaries are currently monitored, varying in size from medium to very large. Intertidal sediment-dwelling organisms (macrofauna - including shellfish and marine worms) and sediment characteristics are used to monitor estuary health. Overall the Waikato estuary sites are in good health.