Scottish drinking water improves

Scottish drinking water improved in 1998 after two years of declining compliance. Overall compliance in supply zones reached 98.3% of samples, compared to 98.1% in 1997 and 98.6% in 1996. Microbiological quality improved but compliance for trihalomethane (THM) disinfection by-products declined. Almost half of Scotland's 588 supply zones failed the THM standards - probably due to increased emphasis on chlorination to achieve microbiological standards. The Loch Lomond supply to central Scotland is a major cause of THM non-compliance and improved treatment is due to come on stream in 1999.

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