Pärnu Department

The Pärnu Department carries out national waste water and surface water monitoring on county level, and surface, ground, drinking and waste water analyses and water sampling at different sites, ordered by companies and institutions.

The purpose of the analyses is to check pollution level in relation to threshold limit values specified in Estonian legislation and international requirements. Tests are run on state-of-the-art equipment, using accredited methods.

If necessary, the lab also introduces new test methods, and participates in periodical national and international interlaboratory tests with all types of water samples. Over 20 physicochemical properties are determined for water: general physical properties (colour, odour etc.), turbidity, suspended matter, biochemical oxygen demand, pH, nitrogen compounds, phosphorus compounds, fluorides, petroleum products, chlorides, sulphur compounds etc.

Some of the environmental services offered

  • Determination of pollutants in waste water to estimate the efficiency of waste water treatment plant and to calculate pollution charges. Primary pollution characteristics are:
    • biochemical oxygen demand (BHT7) that characterizes organic pollution load;
    • total phosphorus, resulting from natural eutrophication or point or diffuse pollution resulting from insufficiently treated wastewater (household and food industry wastewater);
    • total nitrogen, mostly made up from ammonium and nitrate nitrogen originating from households, agriculture and industry;
    • suspended matter of household, agricultural and industrial origin.
  • Assessment of accident-related pollution level in aquatic systems.
  • Inspection of surface and ground water. Assessment of general status of river water quality over a specific period of time, with various characteristics (dissolved oxygen, biochemical oxygen demand, ammonium ions, total phosphorus and total nitrogen) weighted differently.
  • Testing of drinking water quality according to legal requirements.