Maximum contaminant level Study guides, Class notes & Summaries

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 di...

List the 5 characteristics that make water unique - stable, high specific heat, great buffer, expands at freezing, excellent solvent Why is it critical that water stores a lot of energy? - allows large bodies of water to cool or heat Earth to maintain a temperature List the elements of the hydrologic cycle including driving forces - 1/2-Evapotranspiration 3-Condensation 4-Precipitation 5-Runoff 6-Inflitration 7-Subsurface flow 8-Base flow 9-Concentrated surface flow 10-interflow (s...

What is MCL? - Maximum Contaminent Level (MCL) A public water system is any system that serves a population greater that or equal to ? - 15 services connections or 25 people regulary What is the Maximum total chlorine residual allowed by the Disinfectant-Disinfection By-Prouducts Rule - 4 mg/l What type of contaminant is Iron? - Secondary Which Primary Contaminant is sometimes added to water supplies to prevent tooth decay? - Fluoride The Failure of a public water system to comply with t...

Potable water may be defined as: a. Any water that occasionally may be polluted from another source b. Any water that, according to recognized standards, is safe for consumption c. Water high in organic content d. Water that has been transported from outside the service area - ANSWER b). Any water that according to recognized standard is safe for human consumption. To prevent the entry of surface contamination into a well is the purpose of: a. The well casing b. The louvers or slots...

Water Distribution Grades 1 & 2 Practice test exam latest Which agency sets legal limits on the concentration levels of harmful contaminants in potable water distributed to customers? - CORRECT ANSWER-US Environmental Protection Agency The number of monthly distributions system bacteriologiacal samples required is - CORRECT ANSWER-Based on the population served What is the maximum contaminant level for total trihalomethanes (TTHM) in the united States? - CORRECT ANSWER-0.080 mg/L Un...

To prevent the entry of surface contamination into a well is the purpose of: a. The well casing b. The louvers or slots c. Well development d. The sanitary seal - ANSWER-d) The Sanitary Seal Pure water will exhibit a pH value of? a. 0.0 b. 7.0 c. 10.5 d. 14.0 - ANSWER-b) 7.0 A pH reading of 6.0 units indicates that the water sample is: a. Very acidic b. Slightly alkaline c. Very alkaline d. Slightly acidic - ANSWER-d) Slightly Acidic In drinking water quality, "TDS" ...

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 sam...

New Surface water reservoirs in Texas? CORRECT ANSWER-declines in certain areas. Sequestering manganese question? CORRECT ANSWER-Does not allow manganese to combine with oxygen. Lead % in pipe and solder and flux? CORRECT ANSWER-Max lead is 0.25%, lead and solder flux 0.2% Action level for Lead? CORRECT ANSWER-Lead action level is .015% How do you know you have a TTHM MCL violation? CORRECT ANSWER-Locational running average of all samples exceeds TTHM maximum contaminant level is .08...

What is the federal law that protects public water supplies from harmful contaminants? - ANSWER SDWA Safe Drinking Water Act MCL stands for - ANSWER Maximum Contaminant Level True or False? Primary regulations are mandatory - ANSWER TRUE Secondary regulations are about what 3 things? - ANSWER Taste Odor Color of water

Which disinfectant would work best against cryptosporidium? - Ozone The pH of a water sample is greater that the pHs so the Langlier index? - Indicates the water is scale forming. When water high in calcium bicarbonate is softened by ion exchange - Sodium bicarbonate remains in the product water. Lime softening can effectively disinfect water because: - The pH level is higher than 10.5 A noncarbonate hardness compound is - MgSO4 What term refers to the reintroduction of carbon dioxide int...