Provided by referral laboratory (derived from critical concentrations cited in literature):
<42ug/L Green-safe
42 to 107ug/L Amber-warning
>108ug/L Red-action
Provided by referral laboratory (derived from critical concentrations cited in literature):
<42ug/L Green-safe
42 to 107ug/L Amber-warning
>108ug/L Red-action