AWWA ABC Water Distribution Grades 1 & 2 questions and answers

Which agency sets legal limits on the concentration levels of harmful contaminants in potable water distributed to customers? - US Environmental Protection Agency The number of monthly distributions system bacteriologiacal samples required is - Based on the population served What is the maximum contaminant level for total trihalomethanes (TTHM) in the united States? - 0.080 mg/L Under the Surface Water Treatment Rule, disinfection residuals must be collected at the same location in the distribution system as - coliform samples Iron can cause "red water" and thus customer complaints when its concentration is above its secondary maximum contaminant level of - 0.30 mg/L The goal of the Surface Drinking Water Act is for each ________ to accept primary enforcement responsibility (primacy) for the operation of the state's drinking water program. - State What is the objective of Total Coliform Rule? - To promote routine surveillance of distribution system water quality to search for fecal matter and/or disease-causing bacteria Which agency sets standards on the concentration levels of harmful contaminants in drinking water? - EPA Explain the difference between the different tiers of violations. Which tier is the most serious? - Tier 1 = 24 hours (most severe) Tier 2= 30 days Tier 3= 1 yearA positive E. Coli test must be reported to the primacy health agency within what time period? - 24 hours How is the required number of monthly bacteriological samples determined? - Population served What is the action level for lead in first-draw samples taken from customer taps? - 0.015 mg/L A water system is designated a community public water system if it serves how many homes? - 15 or more What authority provides specific water sampling instructions? - The state primacy agency According to the Lead and Copper Rule, what is the action level for lead? - 0.015 mg/L Head is measured in - Feet A plat is - a map At which time of the day is the age of the water stored in the distribution system the highest? - Early morning Water mains should primarily be sized based on - adequate fire flow at an appropriate pressur