D2 water distribution test Questions & Answers

What is the primary purpose of the SDWA? - ANSWERSTo create uniform national standards for drinking water quality AnswerWho sets Maximum Contaminants Levels (MCLs)? - ANSWERSUSEPA AnswerWhat are some of the duties of the EPA? - ANSWERSSets MCLs, delegates enforcement of SDWA to state agencies, provides grant funds, monitors state activities, provides continued research AnswerWhat is state primacy? - ANSWERSGiving the authority to the state to implement and enforce regulations AnswerTrue or False: State requirements must be at least as stringent as those set by USEPA - ANSWERSTrue. AnswerA public water system is a system that supplies piped water for human consumption and that has at least ___ service connections or serves ___ or more persons for ___ or more days of the year. - ANSWERS15, 25, 60 AnswerWhat is an nontransient, noncommunity public water system? Give an example of one. - ANSWERSEstablishments with their own private water systems that serve an average of 25 persons that do not live at the location, but the same people use the water for more than 6 months per year. Example: school or factory AnswerWhat is a transient, noncommunity public water system? Give an example of one. - ANSWERSEstablishments with own water system and serve at least 25 persons a day but these people only use the water occasionally and for short periods of time. Example: Motel or Park AnswerWhat is a community public water system? Give an example of one. - ANSWERSEstablishments with their own water supply that serve more than 15 homes. Example: HOA, or municipal water utilities AnswerWhich of the public water systems are required to only monitor for nitrate, nitrite, and microbiological contamination? - ANSWERStransient, noncommunity AnswerWhat does the National Primary Drinking Water Regulations (NPDWRs) specify? - ANSWERSMCLs or a treatment technique requirement for contaminants that may be found in drinking water and could have an adverse health effect on humans AnswerWhat does the National Secondary Drinking Water Regulations (NPDWRs) specify? - ANSWERSwater contaminants that may adversely affect aesthetic qualities of the water such as taste, odor or color AnswerWhen must an agency post a public notification? - ANSWERSWhen the water system violates any of the operating, monitoring or reporting requirements or if they exceed the MCL AnswerLead and Copper Rule (LCR) - ANSWERSRequires that samples be collected at customers taps after the water has remained undisturbed in the water piping for at least 6 hrs AnswerTrue or False: system operators are required to regularly collect and test water samples. - ANSWERStrue AnswerTrue or False: Water quality cannot change after it enter the distribution system. - ANSWERSfalse -blending, season, operational changes AnswerWhat are the 4 methods of collecting samples? - ANSWERSGrab sample, composite sample, time composite sample, flow-proportional composite sample AnswerWhat is a grab sample? - ANSWERSA single sample at a single location AnswerWhat is a composite sample? - ANSWERSA series of grab samples at one place and at different times AnswerWhat is a time composite sample? - ANSWERSEqual volumes at regular intervals AnswerWhat is a flow proportional composite sample? - ANSWERSAdjusting the sample size proportional to the flow AnswerHow do you select a sample point? - ANSWERSAs close to the main as possible AnswerTrue or false: It is required for samples to be taken from groundwater under the direct influence of surface water. - ANSWERStrue AnswerWhat are Sanitary Surveys? - ANSWERSOn site annual inspection of a water system's facilities and operation. AnswerWhat are some the requirements that the State establishes to ensure proper water system operation? - ANSWERSOperator Certification, sanitary surveys, enforcement AnswerWhat are the 3 main areas of concern to distribution operators? - ANSWERSmicrobiological safety, disinfection by products, lead AnswerTotal coliform rule - ANSWERSto require surveillance of total coliform bacteria AnswerWhen you have a positive sample for coliform you need to take another test within ___hrs? - ANSWERS24 AnswerWhat are the different disinfectants? - ANSWERSphysical and chemical AnswerWhat is hardness? - ANSWERSthe measure of the concentration of calcium and magnesium in water AnswerWhat type of iron bacteria causes red water, taste and odors, clogged pipes and pump failure? - ANSWERSGallionella AnswerWhat is the secondary drinking water standards suggest the limit of iron be in water? - ANSWERS0.5mg/L AnswerDoes very hard or very soft water cause scaling to form in plumbing fixtures and cooking water? - ANSWERShard water AnswerWhat must the turbidity be equal to or less than in measurements taken each month? - ANSWERS0.5 ntu AnswerWhat chemical is not harmful to humans but stains washed clothes and plumbing fixtures black? - ANSWERSmanganese AnswerWhat is necessary to prevent backsiphonage and the entry of contaminants? - ANSWERScontinuous positive pressure AnswerWhat are the 4 water quality safeguards? - ANSWERScontinuous positive pressure, maintenance of chlorine residual, cross connection control, frequent testing