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AQUATIC FACILITY OPERATOR CERTIFICATION
EVALUATION 2026 TESTED QUESTIONS
SOLVED
โ Primary Contaminant that shields harmful bacteria from disinfection processes. Answer: Turbidity โ Device used to measure NTU's. Answer: Nephelometer โ Turbidity is Measured with. Answer: Turbidimeter or Nephelometer โ Chemical sampling results be kept ___ years. Answer: 10 โ Bacteriological sampling results be kept ___ years. Answer: 5 โ Microorganisms whose presence in water indicates probable presence of pathogens.. Answer: Indicator organism โ White powder used to neutralize chlorine. Answer: Sodium Thiosulphate
โ To insure the water being sampled is from the main and not the customers plumbling. Answer: Flush line โ Number is used to determine how many Bac-t samples must be taken. Answer: People served โ Minimum number of Bac-T samples required each month?. Answer: 1 โ Anytime the MCL is exceeded and fecal coliform positive results come back from any of the samples. Answer: Non-acute violation โ If retakes are required this month what is the minimum number of samples required next month. Answer: 5 โ Bacteria that are found only in surface water supplies. Answer: Cryptosporidium & Giardia โ How soon must NMED be notified that a Bacterial MCL has been exceeded? ___ hours. Answer: 24 โ Coliform group. Answer: Indicator organism
โ Byprouducts of drinking water chlorination. these byprouducts form when chlorine reacts with dissolved natural organic matter, moslty plant life. Answer: Trihalomethanes โ Cause problems with liver, kidney, central nervous systems, may increase cancer risk and have possible reprouductive health risks. Answer: Trihalomethanes โ Used to locate Chlorine leaks. Answer: Ammonia โ Disinfectants used to treat drinking water. Most commonly formed when ammonia is added to chlorine to treat drinking water. The typical purpose is to provide longer-lasting water treatment as the water moves through pipes to consumers. This type of disinfection is known as secondary disinfection.. Answer: Chloramines โ Found in bleach. Answer: Sodium Hypochlorite โ Results in a free chlorine residual. Answer: Breakpoint chlorination โ Formed when Chlorine reacts with water. Answer: Hypochlorus acid & Hydrochloric acid
โ Additional piece of equipment needed to feed liquefied chlorine gas from a ton cylinder. Answer: Evaporator โ To keep Chlorine cylinders from rupturing from gas expanding. Chlorine rooms be kept below ___ F degrees. Answer: 120 โ Keep the chlorine gas forming Chlorine Hydrate also know as "GREEN ICE". Chlorine room be kept above ___ F degrees?. Answer: 60 โ Prevent Chlorine cylinders from rupturing when gets too hot. Answer: Fusible Plugs โ At what temperature does the designed fusible plugs melt? ___ F. Answer: 157 โ Why is Fluoride added to drinking water?. Answer: Prevent tooth decay โ Chemicals used as sources of fluoride. Answer: Sodium silicofluoride and hydrofluorosilic acid โ Optimum concentration of fluoride in water. ___ mg/l. Answer: 0.
โ Under registers and records less water than actually used. Answer: Worn meter โ Caused by closing a valve too quickly. Answer: Water hammer โ The best way to protect the water supply from contamination by cross-connection. Answer: Air gap โ The positive side of the cathodic protection system. Answer: Cathode โ When filling a main, the water velocity should never exceed? ___ ft/sec. Answer: 1 โ Used when two storage tanks that serve the same area have different overflow elevations. Answer: Altitude Valve โ Composed of two meters that can read small flows and large flows. Answer: Compound meter โ Why should you never throttle the flow using the hydrant valve on a dry-barrel hydrant. Answer: Drain hole will be open which may undercut the sidewalk and hydrant
โ Fire hydrants should never be placed on less than ___ inch water line. Answer: 6 โ Two means of determining the chemical stability of water. Answer: Baylis Curve and Calcium Carbonate Stability Test (Marble Test) โ Production of mounds of rust on the inside of the pipe. Answer: Tuberculation โ Type of pipe is not affected by corrosive water. Answer: PVC (Polyvinyl Chloride) โ Most common type of residential meter. Answer: Positive displacement meter โ Wet barrel and dry barrel. Answer: Two types of fire hydrants โ Should be done before you excavate to make a repair. Answer: Contact NMOC (New Mexico One Call), by phone, dial 811. โ Mineral Contaminants. Answer: Iron, Manganese, Carbon Dioxide, Hydro Sulfide
โ Violations for Radiological must be reported in ___ hours. Answer: 48 โ Sanitary survey records must be kept ___ years. Answer: 10 โ Removal of taste and odor problems. Answer: Air stripping โ Head loss for a Rapid sand Filter should not be more than ___ feet. Answer: 8 โ Rapid sand filter run time should not exceed ___ hours. Answer: 100 โ Determines what water level that is required for water treatment operator. Answer: Population โ Chlorine gas flexible feed tubes should be replaced every ___ months. Answer: 6 โ Flash mixers detention time be ___ minutes or 5 to 7 feet per second. Answer: 1 - 3
โ Low voltage current through the water in a storage tank which concentrates corrosion on the sacrificial anode. Answer: Cathodic protection โ Main operating unit in a centrifugal pump. Answer: Impeller โ An attachment to the well casing to provide a sanitary seal between the well casing and the effluent line. Answer: Pitless adapter โ Height a centrifugal pump can theoretically push water ___ feet. Answer: 33. โ Scale forming substance in water. Answer: Calcium carbonate โ Nuetral pH. Answer: 7 โ Minimum velocity to flush distribution system. ___ fps. Answer: 2. โ Regulation minimum design pressure in distribution system. ___ psi. Answer: 30 โ Physical link between a potable water system and one of unknown quality. Answer: Cross connection
โ Dissimilar metals reacting to each other in an aqueous solution. Answer: Galvanic corrosion โ Water needed for a bacti sample. ___ ml. Answer: 100 โ Gate valve primary usage in a distribution system. Answer: Isolation โ Has a secondary MCL. Answer: Manganese โ Action level for copper. ___ mg/l. Answer: 1. โ Any person responsible for the operation of all or any portion of a water supply system or wastewater facility. Answer: Operator โ Makes sure public waters systems treat the water to meet water quality standards, designed to protect the public from unnecessary health risks.. Answer: Safe Drinking Water Act (SDWA) โ New Mexico Water Conservation Fee. Answer: 3 cents per 1000 gallons
โ Used to fund sample collection and testing for inorganic, organic, and radiological contaminants in accordance with the 1986 SDWA. Answer: New Mexico Water Conservation Fee โ Compliance sampling will either occur at. Answer: Point of entry or point of use โ Taken from customers taps after plumbing has been flushed with fresh water from the distribution system. Answer: Microbiological samples โ Disinfection by-products samples are taken from?. Answer: Distribution system โ Lead and copper samples are taken from?. Answer: Point of use sites draw directly from customers plumbing fixtures โ Lead and copper samples are taken after water has not been in use for ___ hours. Answer: 6 - 8 โ Why must Drinking water distribution system sampling plans be developed. Answer: Make sure samples are taken from the appropriate locations within the system
โ If coliform bacteria are present in the water supply ___ may be present. Answer: Pathogens โ These bottles have a hinged cap that has a snap on type seal and a hinged latch to secure it also come with a plastic key. Answer: Snap Lid bottle โ Never use a kitchen sink faucet that swivels or and outdoor faucet that drips when selecting a __. Answer: Sampling point โ You should flush the line ___ minutes or until the temperature changes before taking a sample. Answer: 3 - 5 โ How many mL for a chlorine sample. Answer: 5 โ how many mL for a pH sample. Answer: 10 โ Hold the bottle at a ___ degree angle while filling it. Answer: 45 โ Samples must be refrigerated at ___ degrees Fahrenheit. Answer: 39
โ When would you collect microbiological samples for reasons other than monitoring compliance. Answer: New & repaired water lines or wells that have been disinfected โ When collecting microbiological samples for reasons other than monitoring compliance such as new water lines You would check ___ on the form. Answer: Special sample โ It is important to take compliance sample at the beginning of the week incase. Answer: Repeat samples are needed โ Radiological violation records must be kept ___ years.. Answer: 10 โ Chemical violation records must be kept ___ years. Answer: 10 โ All vents and overflows on a storage tank should be. Answer: Screened โ If a single chlorine cylinder freezes. Answer: Feed Rate is too high โ Prevents water passing from the high pressure side back to the suction side and recirculate through the impeller again.. Answer: Wear rings
โ Ladders must extend at least ___ feet above the trench?. Answer: 3 โ Chlorine is ___ times heavier than water. Answer: 1. โ Gate valves have ___ turns per inch. Answer: 3 โ Average detention time for flocculation process in minutes. Answer: 30 - 60 โ Detention time in rapid mix process in minutes. Answer: 1 - 3 โ Trunk line in a large municipal should have a isolation valve every ___ feet. Answer: 300 - 600 โ If a excavation is over ___ feet deep shoring may be needed if there isn't enough space to adequately slope a trench.. Answer: 5 โ A excavation over ___ feet deep must have a ladder for access. Answer: 4 โ Ladders in a trench must be located no more than ___ feet from workers. Answer: 25
