Regulation 20 Methods of analysisI1
Scotland
Each enforcing authority must ensure that the method used for the analysis of a parameter in a sample of water pursuant to regulation 18—
complies with the specifications for the analysis of the parameter in schedule 4; or
produces results which are at least as reliable as those produced by a method which complies with the specifications for the analysis of the parameter in schedule 4.
A method of analysis in relation to which paragraph (1)(b) applies may be used only if—
the enforcing authority has provided all relevant information concerning the method and its equivalence to—
the Drinking Water Quality Regulator for Scotland; and
the Scottish Ministers; and
the Drinking Water Quality Regulator for Scotland—
is satisfied that it can be demonstrated that the alternative method produces results which are at least as reliable as those produced by a method which complies with the specifications for the analysis of the parameter in schedule 4; and
has confirmed this by notice to the enforcing authority.