You receive water test results showing elevated total coliforms; what immediate steps would you take?

• A. Ignore and continue operating
• B. Issue advisories as required, isolate affected lines, flush system, sanitize, retest, and investigate contamination sources
• C. Increase production of water
• D. Replace entire water system

Answer: (B)

Elevated total coliforms signal possible contamination in the distribution system, so the first priority is to protect public health by deploying immediate containment and verification steps. Issue advisories as required to notify users, isolate the affected lines to prevent further distribution of possibly contaminated water, flush the system to remove loose contaminants, sanitize the system to inactivate microbes, and then retest to confirm the water meets safety criteria. Investigating contamination sources helps identify how it occurred and prevents recurrence, guiding longer-term fixes. Reactions that ignore the issue, ramp up production without addressing contamination, or replacing the entire system are inappropriate or unnecessarily disruptive for a short-term contamination event. Together these actions balance rapid protection with verification and prevention.