Lake water quality state percentiles, by monitoring site, 2009-2014

When nutrients accumulate in lakes (referred to as ‘nutrient enrichment’) above certain levels, they can make the lakes murky and green with algae, and lower oxygen levels. Lakes with extremely poor water quality are rarely suitable for recreation and provide poor habitats for aquatic species.

Percentile calculations for the following parameters are provided: Trophic Level Index 3 (TLI) Chlorophyll-a (CHLA) Bottom-water dissolved oxygen (DObottom) Ammoniacal nitrogen (NH4N) Oxidised nitrogen (NO3N) Total nitrogen (unfiltered) (TN) Dissolved reactive phosphorus (DRP) Total phosphorus (unfiltered) (TP)

For more information please see: Larned, S, Snelder, T, Unwin, M, McBride, G, Verburg, P, McMillan, H (2015).Analysis of Water Quality in New Zealand lakes and Rivers: data sources, data sets, assumptions, limitations, methods and results. NIWA Client Report no. CHC2015-033. Available at from the Ministry for the Environment dataservice.

This dataset relates to the "Lake water quality: Trophic Level Index" measure on the Environmental Indicators, Te taiao Aotearoa website.

Data and Resources

Additional Info

Field Value
Author Ministry for the Environment
Maintainer Ministry for the Environment
Maintainer Email Ministry for the Environment
Created 2015-09-29T04:50:38.025201Z
Date modified 2015-10-18T23:51:07.284748Z
Language English
Source Identifier
Record created February 2, 2020, Last Updated April 2, 2021