What is the ideal pH range for drinking water as per AWWA guidelines?
The AWWA and other regulatory agencies recommend a pH range of 6.5 to 8.5 for drinking water. This range ensures water is neither too acidic nor too alkaline, which could cause corrosion in pipes or harm to consumers.
What is the maximum allowable turbidity level for drinking water under AWWA standards?
A turbidity level of 0.3 NTU or less is required for treated water to meet AWWA and EPA standards. High turbidity can indicate the presence of pathogens and reduce the effectiveness of disinfection.
What is the minimum recommended free chlorine residual in a distribution system?
A free chlorine residual of at least 0.2 mg/L is recommended in distribution systems to maintain disinfection and prevent microbial contamination.
Which contaminant is monitored to ensure compliance with nitrate levels in drinking water?
Nitrate (NO₃) levels are monitored to ensure they remain below the maximum contaminant level (MCL) of 10 mg/L as nitrogen, as excessive nitrate can cause health issues, particularly in infants (e.g., methemoglobinemia or "blue baby syndrome").
What is the purpose of testing for Total Coliform in water systems?
Total coliform bacteria are used as an indicator of microbial contamination. Their presence suggests that pathogens may also be present, and further testing is necessary to ensure water safety.