HELCOM 26 by adopting HELCOM Recommendation 26/2 “Compilation of Waterborne Pollution Load (PLC-Water)” decided that the waterborne pollution load compilations will be carried out in two phases:

  • Total waterborne loads (rivers, unmonitored and coastal areas as well as point sources and diffuse sources discharging directly to the Baltic Sea) of nutrients and hazardous substances are reported to HELCOM annually and assessed as annual Indicator reports,
  • Comprehensive Waterborne Pollution Load Compilations quantifying waterborne discharges
    from point sources and losses from non-point pollution sources as well as natural
    background losses into inland surface waters within the catchment area of the Baltic Sea
    located within the borders of the Contracting Parties are reported to HELCOM every sixth
    year starting in 2006.

These pollution load compilations should be carried out in accordance with the valid Guidelines for the Waterborne Pollution Load Compilation.
The Guidelines (updated 2 February 2006) can by downloaded as one pdf file or by chapter:

General Information

Load-orientated approach: Quantification of total load to the Baltic Sea, retention and riverine load apportionment

Source-orientated approach: Methodology for assessing point and diffuse sources and natural background losses

Quality Assurance


Annex 1: Method 1 - Nutrient mass balance models for river systems, a German approach

Annex 2: Method 2 - Nutrient mass balance models for Lakes, a Danish approach

Annex 3: Method 3 - Nutrient transport and transformation (retention), the Swedish approach

Annex 4: Reporting format for the quantification and reporting obligations

Annex 5: Categories of industrial activities referred in Annex 1 of the IPPC Directive

Reporting forms:

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