Sources in selection1204 source categoriesParameter results—August 2026Sampling gaps—No result for selected parameter / monthMedian concentration—Select a parameter to compare
Jan 2026 Aug 2026
All 120 sources · All countries
Preparing Mekong geography…
MEKONG / LANCANGSource distribution
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Counts of sources associated with each potential contaminant group. Select a cell to filter the map.
A source can relate to several groups; counts overlap.
JAN — AUG 2026
Parameter trend
Monthly median
Selected source cohort · samples available each month
View values and sample counts
Sample availability varies by month. A change in the median is not a confirmed change at every site.
GEOGRAPHIC COMPARISON
Where are the sampling gaps?
Sources with and without a result for the selected parameter. Select an area to focus the map.
Result availableNo result
SOURCE COMPOSITION
Activities in this selection
Source concentration
Compare the distribution of sources using the density view.
Demonstration data. All 120 source locations, activities, sampling histories and analytical values are synthetic examples. They do not identify actual facilities or communities as polluters. Source associations indicate potential contaminants to investigate, not confirmed contamination. No compliance, drinking-water safety, pollution transport or exposure assessment is implied.
Methods, research & geographic sources ＋
Read the analytics
All charts follow the filters. “Analyze current map view” also restricts the selection geographically. The monthly trend retains the selected source cohort and recalculates available observations for each month; the coverage filter selects that cohort at the chosen month. Medians use one result per source, month and parameter. Different parameters and units are never combined.
Sampling gaps mean no recorded result for the selected parameter and month, including untested analytes. They do not indicate clean or contaminated water. Concentration colors show the relative numeric range; they are not regulatory thresholds. Only parameters associated with an activity’s assigned profile have generated assays. Pesticide screening is represented as a potential investigation need without assay values.
Density is the number of source points in each 0.25° × 0.25° geographic cell. Cell areas vary with latitude. It is not pollution intensity, pollutant load or a hydrologic catchment.
The emphasis on coverage and comparable observations is informed by UNEP’s ambient water-quality monitoring programme. This dashboard does not calculate the SDG indicator or apply US thresholds to Lao waters.
Priority next connections: laboratory results with method and detection limits; discharge inventories and permits; verified drainage links; monitoring sites and response records.
Geographic reference
Real Mekong/Lancang and selected river lines and towns use Natural Earth at 1:10 million; country outlines use 1:50 million. These generalized layers are not a complete basin or tributary inventory. View provenance ↗.
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