A special test may be required for a public water supply system exceeding the following amounts:

Constituent Maximum Amount

(1) Iron............................................0.30 mg/l

(2) Manganese..............................0.05 mg/l

(3) Chloride...................................250.00 mg/l

(4) Sulfate......................................250.00 mg/l

(5) Total dissolved solids.............500.00 mg/l