What action level and indicators are involved in bacteriological testing under the Safe Drinking Water Act, and what happens if coliforms are detected?

What action level and indicators are involved in bacteriological testing under the Safe Drinking Water Act, and what happens if coliforms are detected?

• A. Total coliform as an indicator; E. coli as fecal indicator; detection triggers follow-up sampling, corrective actions, and possibly boil-water advisories.
• B. Only E. coli is tested; detection triggers no action.
• C. Arsenic levels determine action; no follow-up sampling.
• D. Total coliforms trigger only a notification; no boil-water advisories.

Answer: (A)