Info

Based on monthly average: 1 TU or up to 5 TU if the water supplier can demonstrate that the higher turbidity does not interfere with disinfection.

(continued)

Contaminants

Concentration (mg/L, unless otherwise noted)

Microbiological contaminants Based on average of two consecutive days: 5 TU

Membrane filter technique: not to exceed 1/100 mL on monthly basis; not to exceed 4/100 mL of coliforms in more than one sample in fewer than 20 samples per month on an individual sample basis; not to exceed 4/100 mL of coliforms in more than 5% of sample in more than 20 samples per month on an individual basis.

Fermentation tube method:

1. 10-mL standard portions: coliforms shall not be present in more than 10% of the portions on monthly basis; coliforms shall not be present in three or more portions in more than one sample in fewer than 20 samples per month on an individual basis; coliforms shall not be present in three or more portions in more than 5% of samples in more than 20 samples per month on an individual basis.

2. 100-mL standard portions: coliforms shall not be present in more than 60% of the portions on monthly basis; coliforms shall not be present in five portions in more than one sample in fewer than 20 samples per month on an individual basis; coliforms shall not be present in five portions in more than 20% of samples in more than 20 samples per month on an individual basis.

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