Water Quality
3.
Wildlife and Livestock
To protect
wildlife and livestock from adverse effects, the average concentration
of chlorate should not exceed 3 mg/L.
Rationale:
The recommended guideline was designed to protect dogs. Applying the safety
factor of 0.01 to an LD50 of 500 mg/kg gives a guideline of 5 mg/kg.
At 5 mg/kg chlorate and 80 mL/kg water intake the chlorate concentration in
the water should not exceed 62.5 mg/L for an adult animal. The chlorate level
to protect neonate animals becomes 4.166 mg/L if the same ratio (1:15) of chlorate
intake for neonate animals to adult animals is used as was used in humans.
When the same water to food source ratio as was applied for humans (70% in
water and 30% in food) is used, the guideline becomes 3 mg/L. This is close
to the 2.4 mg/L proposed for human drinking water.
