| Element | Description |
| Level | Researchers [1] summarized the monitoring data that were accessible for their review. Table 6 displays the DOC monitoring data collected in 2009 and 2010 from chosen drinking water sources in every region of Canada [1] . Such facts as well show lower DOC levels in groundwater with a minimal change between raw and treated water concentrations. For the surveyed surface water supplies, average treated water DOC ranges from 3.2 - 3.4 mg/L in summer and 2.8 - 3.5 mg/L in winter. |
| Quality | Numerous investigations have analyzed the six NOM portions (see Table 4) found in several Canadian source waters [1] . Researcher [148] examined a lake source in Nova Scotia and detected important temporal variability in the six NOM fractions; however, DOC levels stayed low with minimal alteration. Investigators [149] investigated a river source in Manitoba and as well noted important temporal variability in the six NOM portions but with fluctuations in DOC levels. Other researches established that NOM quality could change greatly by location [1] . The findings of such fractionation investigations proved the variability that could happen in the NOM feature―with or without a related modification in the DOC level. Moreover, the findings show that the hydrophilic neutral portion could sometimes include a considerable part of NOM. Such a part could be especially troublesome [1] . |