C or c Marginal, moderate level of risk, may be acceptable in some small communities. D or d Unsatisfactory, high level of risk. E or e Completely unsatisfactory, very high level of risk. Larger communities may have several distribution zones delivering water from different sources or treatment stations, each with a different grade. We give the lowest of those grades.
Some communities have a mix of satisfactory and unsatisfactory grades.
Ed in Te Puke Bush, Eb in Eastern Districts. Wellington Cd in Eastern Wellington. Ca in Johnsonville, Onslow, Wadestown, Wellington Central. Cb in Southern Wellington , Kelburn, Brooklyn, Karori. Elsewhere Aa or Ab.