5.3 Small Water System Operations, Administration & Plant Recordkeeping

5.3 Small Water System Operations, Administration & Plant Recordkeeping

Of the thousands of public water systems in North Carolina, the large majority serve fewer than 3,300 people. They face the same rules as a regional utility with a fraction of the staff, which is why the certification schools cover small-system operation as its own subject and the examinations score it as its own category.

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1. The routine visit at a small well system

A compliant visit under 18C .1303(a) is not a drive-by. Working from source to entry point:

1. Wellhead: cap and seal tight, vent screened and facing down, pad draining away, no cross-connections, no standing water.
2. Pump and controls: running amps compared to nameplate, cycle counts, control panel free of moisture and insects, no burned contactors.
3. Chemical feed: day tank level, calculated usage since last visit, pump stroke and speed settings, drawdown calibration, suction and discharge tubing condition, injection quill free of scale.
4. Water quality: entry-point residual disinfectant, pH, and any other tests required by the monthly report; distribution residual at a sampling point selected from the sample siting plan.
5. Storage: tank level and cycling, hatch locked and gasketed, vent and overflow screened, no evidence of intrusion.
6. Records: date, arrival and departure time, name and certificate number, chemical quantities added, test results, adjustments made, and anything abnormal.

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2. Hypochlorite feed control in practice

Small systems almost universally feed sodium hypochlorite with a diaphragm metering pump. Three habits keep this working:

• Calibrate by drawdown. Run the pump against a graduated calibration cylinder for a timed interval. Feed rate in mL/min converts directly to gallons per day, which converts to a dose given the well's pumping rate.

  Dose (mg/L) = [feed rate (gpd) × solution strength (decimal) × 8.34 × specific gravity] ÷ [flow (MGD) × 8.34]

• Pace the feed. The chemical pump must run only when the well runs — wired to the pump starter or paced from a flow meter. A chemical pump left running against a stopped well overdoses the first water into the system and empties the day tank.

• Verify, don't assume. A pump that is stroking is not necessarily feeding: air-bound heads, a failed foot valve, a crystallized injection quill, or a leaking diaphragm all produce motion without chemical. The residual test at the entry point is the proof.

Chemical storage. 12.5 percent sodium hypochlorite degrades with temperature, sunlight, and time — losing strength measurably within weeks in a hot shed. Buy in quantities consumed within the product's useful life, store cool and dark, date every delivery, and use oldest stock first. Calcium hypochlorite tablets and granules store better but present a serious fire hazard if contaminated with oil, grease, or organic material.

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3. Standard operating procedures and uncertified staff

18D .0701(f) requires the ORC to establish written SOPs for each facility so that decisions about water quality or quantity that affect public health are carried out, and so that persons lacking proper certification refer all such decisions to the certified operator on duty or to the ORC. 18C .1301(c) builds on this for distribution sampling: a designee working under the ORC's direction may collect distribution samples and field measurements, provided the SOP covers the procedures and the designee can contact the ORC or a certified operator at all times to report a low residual or other problem.

A usable small-system SOP names the task, the acceptable range, the action to take, and the point at which the operator must be called — for example: "If the entry-point free chlorine residual is below 0.4 mg/L, do not adjust the chemical feed. Record the reading and telephone the ORC immediately."

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4. Administration, budgeting, and asset management

• Rates and reserves. A small system's most common failure mode is financial: rates that cover chemicals and power but not pump replacement, tank painting, or meter change-out. Building a capital reserve line into the annual budget is what keeps a 40-year-old well from becoming an emergency.
• Asset inventory. A simple list — wells, pumps, tanks, valves, meters, hydrants, with install dates and expected life — converts unpredictable emergencies into scheduled replacements.
• Consumer Confidence Report. Community systems must deliver a CCR to customers by July 1 each year covering the previous calendar year.
• Emergency plan. Even a two-well system needs a written plan: who to call, where the bypass connections and valves are, how to issue a boil water advisory, and where to get bulk water or a portable generator.
• Cross-connection program. Once a system must have five or more testable backflow assemblies, the program records in 18C .0406(b)(6) apply and a Cross-Connection Control ORC is required.

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5. Records to keep and for how long

[!WARNING] The three most common small-system findings. Sanitary surveys in North Carolina repeatedly document the same three problems: an unscreened or missing well vent screen, a chemical feed pump with no calibration record, and no operating log demonstrating the required visit frequency. All three are fixed by the routine described above and cost nothing but discipline.