"FREQUENCY_UNIT_INDICATOR_CW"
CW: indicates whether the file contains cross-walked district codes or not. Absence of "CW" postfix indicates the absence of crosswalked district codes
crosswalked dataset are used to compare throughout timelines as it has been treated for changes in region border changes
non-crosswalked dataset are used for analysis for one point of time

Data Source: Ministry of Environment and Forestry, Processed by LPEM FEB UI
Last updated: 31 December 2019

In 2019, the Water Quality Index (IKA) composed of 7 paramaters, which are DO, Fecal Coli, COD, BOD, Total Phosphate, TSS, and Total Coliform. The calculation method was based on National Sanitaion Foundation Water Quality Index (NSF-WQI)
The data was collected from the Ministry of Environment and Forestry.