| # | Which of the following violations requires public notification? | failure to monitor. | MCL violation. | failure to follow variance or exemption compliance schedule. | all of these. | | 4
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| 1 | If a water supply exceeds an MCL, whose responsibility is it to notify the consumer? | the testing laboratory. | the state. | the water supplies. | the EPA. | | 3 |
| 2 | Two chemical contaminants with MCLs that are regulated in both community and non-community systems are? | nitrate and sodium. | nitrate and turbidity. | sodium and lead. | fluoride and nitrate. | | 2 |
| 3 | There is only one contaminant MCL that varies with temperature. What is it? | fluoride. | sodium. | nitrate. | mercury. | | 1 |
| 4 | The number of water samples to be taken per month on a given water supply is based on? | the length of the distribution lines. | the size of the population being served. | the size of the water mains being used. | frequency of system repairs. | the type of treatment being used. | 2 |
| 5 | MCLs must be measured at the free-flowing outlet of the ultimate user of a public water system, except in the case of? | arsenic. | gross alpha activity. | coliform bacteria. | turbidity. | suspended solids. | 4 |
| 6 | The MCL for arsenic is? | 1,05 mg/L. | 1,50 mg/L. | 0,15 mg/L. | 0,05 mg/L. | | 4 |
| 7 | The MCL for gross alpha radiation is _________ pCi/L? | 5. | 10. | 15. | 20. | | 3 |
| 8 | The MCL for lead is? | 0,005 mg/L. | 0,10 mg/L. | 0,05 mg/L. | 1,05 mg/L. | | 3 |
| 9 | The MCL for mercury is? | 0,001 mg/L. | 0,002 mg/L. | 0,005 mg/L. | 0,05 mg/L. | 0,01 mg/L. | 2 |
| 10 | The MCL for nitrate is? | 5 mg/L as nitrogen. | 10 mg/L as nitrogen. | 25 mg/L as nitrogen. | 45 mg/L as nitrogen. | | 2 |
| 11 | The MCL for combined radium-266 and radium-228 in a community water system is? | 5 mg/L. | 5 pCi/L. | 15 mg/L. | 15 pCi/L. | none of the above. | 2 |
| 12 | The MCL for turbidity is __________ TU as measured with a nephelometer or turbidimeter? | 5. | 1. | 3. | 10. | | 2
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