In the mid 1990's non-compliance with the 10µg/L lead standard, which came into force in 2014, was around 25% in the region. This was attributed to the large number of properties with lead service pipes (circa 1 million). Estimates in the proportion of properties with lead service pipes vary widely from 20 to 44%. In order to meet the 10µg/L standard plumbosolvency treatment was implemented on all supplies with less than 98 % compliance by the end of 2003. By 2004 lead non-compliance had fallen below 2% which represents 90% reduction in lead non-compliance. During the period 2005 to 2010 a few minor additional plumbosolvency supplies were delivered for low-risk supplies (those with compliance in excess of 98%). These represented less than a few percent of supply and overall are not substantive. Over 99% of the water supplied is phosphate dosed. The only untreated areas are a few rural communities where surveys had confirmed that there were no lead services.