Septic tanks and sewage treatment plants may also dischargeeffluents into waterways, adding harmful microorganisms.
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The Kaipara farmer, Michael Griffiths, admitted two charges of illegally dischargingeffluent in August last year.
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The facility, which was in a dire state of disrepair and barely functioning, troubled surrounding communities by dischargingeffluent into the surrounding water sources.
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In September three dairy farmers who were convicted in the Tauranga District Court for illegally dischargingeffluent were fined a total of $89,000.