KS Water Operator key terms

Adding a chemical such as alum to raw water so that tiny suspended particles clump together and can later be removed. It is the first step of conventional clarification and requires rapid mixing.

Gentle, slow stirring of chemically treated water so that small clumps of particles join into larger, heavier masses called floc that settle readily in a clarifier.

Holding water in a basin long enough for heavy particles and floc to settle to the bottom as sludge, producing clearer water before filtration.

Passing water through sand, anthracite, or membranes to trap remaining particles and organisms. It is a physical barrier and, for most surface supplies, a required treatment step.

Reversing flow upward through a filter to wash out trapped particles and restore capacity. Operators watch head loss and effluent turbidity to decide when to start and end it.

A measure of how cloudy water is because of suspended particles, reported in nephelometric turbidity units. High readings can shield pathogens from disinfection and are a key regulatory limit.

Compounds such as trihalomethanes and haloacetic acids that form when chlorine reacts with natural organic matter. Their limits push utilities to balance pathogen control against chemical risk.

The amount of chlorine still present in water after treatment, measured as free or total chlorine. A detectable residual protects the distribution system against recontamination.

The product of disinfectant concentration and contact time used to show that a required level of pathogen inactivation has been achieved. It depends on pH, temperature, and the target organism.

A bench-scale test in which several beakers of raw water receive different coagulant doses and are stirred identically, so the operator can choose the best chemical dose for the plant.

The concentration of carbon-based compounds in water, largely from decaying plant material. It is a precursor for disinfection byproducts and is often reduced by coagulation or carbon adsorption.

A large pipe that carries treated water through a service area and supplies smaller branch lines. Mains are typically looped so that flow can be rerouted during repairs.

A portion of the distribution system kept within a defined pressure range by pumps, valves, or storage tanks. Zones prevent excessive pressure at low elevations and low pressure at high ground.

The imaginary line showing the pressure head plus elevation of water at any point in a piping system. Operators use it to check where pressure will be adequate or negative.

A pressure surge caused by a sudden change in flow, such as fast valve closure or a pump trip. It can rupture pipes and is mitigated with slow valve operation and surge protection.

Any actual or potential link between a potable water system and a source of contamination. Examples include irrigation lines, chemical feed lines, and submerged hoses.

A tested assembly such as a reduced-pressure-zone valve or double check valve that stops contaminated water from flowing backward into the drinking water system. Many require annual testing.

A physical separation, open to the atmosphere, between a potable water outlet and the highest possible level of a contaminating liquid or fixture rim. It is the most reliable backflow protection.

Failure of a distribution pipe that releases water and can depressurize the system, allowing contaminants to enter. Response includes isolation, repair, disinfection, and flushing.

A reservoir in the distribution system that balances supply and demand, provides fire flow, and maintains pressure. Tanks need routine inspection, mixing, and disinfection to stay safe.

An underground layer of sand, gravel, or rock that holds and transmits usable amounts of groundwater. Wells draw from aquifers, which can be confined or unconfined.

The downward-curving water surface around a pumping well caused by drawdown. It can pull in nearby contamination or reduce yield from neighboring wells.

Managing land and activities near a well to keep contaminants from reaching the water supply. It includes delineating contributing areas, controlling chemical use, and sealing abandoned wells.

A study that identifies where a utility's water comes from, what contaminants could reach it, and how vulnerable the supply is. Results guide monitoring and protection priorities.

The land area that drains into a river, lake, or reservoir used as a water source. Activities such as farming, logging, and development within it affect raw water quality.

Water from rivers, lakes, streams, or reservoirs that is open to the atmosphere and exposed to runoff. It generally requires filtration and disinfection and varies quickly with weather.

Water held in pores and fractures beneath the earth's surface. It is usually clearer and more stable in quality than surface water but can carry dissolved minerals and contaminants.

The highest concentration of a regulated contaminant allowed in water delivered to customers. It is set as close to the health goal as feasible given available treatment and cost.

A non-enforceable health-based target for a contaminant, set at a level with no known adverse health effects. It is the benchmark against which the enforceable limit is set.

The required sampling of water at specified frequencies and locations, plus submitting results to the regulator and informing the public. Missing a sample can itself be a violation.

An annual notice delivered to customers that lists detected contaminants, their levels, and any violations. It must be issued by a set deadline each year.

A public health advisory telling customers to boil or otherwise disinfect tap water before drinking because of suspected contamination or loss of treatment. It is lifted only after testing confirms safety.

A state-issued credential showing that a water system operator has met education, experience, and examination requirements. Higher grades allow operation of more complex systems.

Training hours that certified operators must earn within each renewal period to keep their credential current and learn about new rules, technology, and safety practices.

A space large enough to enter, with limited entry or exit, not designed for continuous occupancy. Examples include vaults, tanks, and pits and entry requires a permit and atmospheric testing.

A procedure that isolates energy sources with locks and tags before equipment is serviced, preventing accidental startup or release of stored energy that could injure workers.

Gear such as gloves, goggles, respirators, and chemical suits worn to reduce exposure to hazards. It is the last line of defense after engineering and administrative controls.

A document provided by a chemical manufacturer that lists hazards, handling, storage, first aid, and spill response information. It must be readily available to employees using the chemical.

A planned approach to tracking, maintaining, and funding water system components so they deliver reliable service at the lowest long-term cost. It supports repair-versus-replace decisions.

The schedule of charges a utility uses to recover costs from customers, often combining a fixed base fee with volume-based tiers. It funds operation, maintenance, and capital needs.